研究者データベース

浦木 康光(ウラキ ヤスミツ)
農学研究院 基盤研究部門 森林科学分野
教授

基本情報

所属

  • 農学研究院 基盤研究部門 森林科学分野

職名

  • 教授

学位

  • 理学博士(北海道大学)
  • 理学修士(北海道大学)

ホームページURL

J-Global ID

研究キーワード

  • 木質資源化学   多糖類化学   高分子化学   Polysaccharide Chemistry   Polymer Chemistry   Wood Chemistry   

研究分野

  • ライフサイエンス / 木質科学
  • ナノテク・材料 / 生体化学
  • ナノテク・材料 / 高分子化学

職歴

  • 2008年 - 現在 北海道大学 大学院農学研究院 教授
  • 2006年 - 2008年 - 北海道大学大学院農学研究院 准教授
  • 1999年 - 2006年 Associate Professor,Graduate School of Agriculture, Hokkaido University
  • 2006年 - Associate Professor,Research Faculty of Agriculture, Hokkaido University
  • 1994年 - 1999年 北海道大学農学部 助教授
  • 1994年 - 1999年 Associate Professor,Faculty of Agriculture, Hokkaido University
  • 1989年 - 1994年 北海道大学農学部林産学科木材化学講座 助手
  • 1989年 - 1994年 Research Associate,Faculty of Agriculture, Hokkaido University
  • 1987年 - 1989年 北海道大学理学部高分子学科 教務職員
  • 1987年 - 1989年 Research Associate,Faculty of Science, Hokkaido University

学歴

  •         - 1987年   北海道大学   理学研究科   高分子学専攻博士課程中退
  •         - 1987年   北海道大学
  •         - 1986年   北海道大学   理学研究科   高分子学専攻
  •         - 1986年   北海道大学
  •         - 1984年   北海道大学   理学部
  •         - 1984年   北海道大学

所属学協会

  • 木質炭化学会   日本農芸化学会   アメリカ化学会   繊維学会   キチン・キトサン学会   日本木材学会   セルロース学会   高分子学会   The Wood Carbonization Research Society   American Chemical Society   The Society of Fiber Science and Technology, Japan   Japanese Society for Chitin and Chitosan   The Japan Wood Research Society   The Cellulose Society of Japan   The Society of Polymer Science, Japan   

研究活動情報

論文

  • Direct Electrospinning of Cellulose Acetate onto Polyurethane Sheet and Effect of Its Saponification on Mechanical Properties
    浦木 康光
    Journal of Wood Chemistry and Technolog 39 4 282 - 295 2019年08月 [査読有り][通常論文]
  • Development of water-in-oil (w/o) microemulsion from the mixtures of castor oil and sunflower oil as makeup-remover
    浦木 康光
    Journal of Surfactants and Detergents 21 6 809 - 816 2019年06月 [査読有り][通常論文]
  • Development of lignin-based terpolyester film and its application to separator material for electric double-layer capacitor
    浦木 康光
    Journal of Wood Chemistry and Technology, 39 3 199 - 214 2019年06月 [査読有り][通常論文]
  • Shogo Taira, Makoto Kurihara, Keiichi Koda, Kazuki Sugimura, Yoshiyuki Nishio, Yasumitsu Uraki
    Cellulose 26 1 569 - 580 2019年01月 [査読有り][通常論文]
  • Effect of Vapor-Phase Surface Acetylation of Japanese Cedar Wood on Fungal Degradation and Dimensional Stability
    浦木 康光
    Journal of Wood Chemistry and Technology 2019年 [査読有り][通常論文]
  • Ningning Cheng, Keiichi Koda, Yutaka Tamai, Yoko Yamamoto, Taichi E. Takasuka, Yasumitsu Uraki
    BIORESOURCE TECHNOLOGY 232 126 - 132 2017年05月 [査読有り][通常論文]
     
    Amphipathic lignin derivatives (A-LDs) prepared from the black liquor of soda pulping of Japanese cedar are strong accelerators for bioethanol production under a fed-batch simultaneous enzymatic saccharification and fermentation (SSF) process. To improve the bioethanol production concentration, conditions such as reaction temperature, stirring program, and A-LDs loadings were optimized in both small scale and large scale fed-batch SSF. The fed-batch SSF in the presence of 3.0 g/L A-LDs at 38 degrees C gave the maximum ethanol production and a high enzyme recovery rate. Furthermore, a jar-fermenter equipped with a powerful mechanical stirrer was designed for 1.5 L-scale fed-batch SSF to achieve rigorous mixing during high substrate loading. Finally, the 1.5 L fed-batch SSF with a substrate loading of 30% (w/v) produced a high ethanol concentration of 87.9 g/L in the presence of A-LDs under optimized conditions. (C) 2017 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
  • Yoko Yamamoto, Ningning Cheng, Keiichi Koda, Kiyohiko Igarashi, Yutaka Tamai, Yasumitsu Uraki
    CELLULOSE 24 4 1849 - 1862 2017年04月 [査読有り][通常論文]
     
    Amphipathic lignin derivatives (ALDs), prepared from hardwood acetic acid lignin and softwood soda lignin via coupling with a mono-epoxylated polyethylene glycol, have been reported to improve the enzymatic saccharification efficiency of lignocellulose while maintaining significant residual cellulase activity after saccharification. We previously demonstrated that the effect of ALDs was caused by a direct interaction between ALDs and Cel6A (or CBH II). In this study, a different ALD was prepared from softwood kraft lignin in addition to aforementioned ALDs. The interactions between all the ALDs and the enzymes other than Cel6A, such as Cel7A and Cel7B, in a cellulase cocktail were investigated using surface plasmon resonance. The kraft lignin-based ALD showed the highest residual cellulase activity among all ALDs and an improved cellulolytic enzyme efficiency similar to those of the other ALDs. All ALDs were found to directly associate with major enzymes in the cellulase cocktail, Cel6A and Cel7A (or CBH I), but not with Cel7B (or EG I). In addition, the ALDs showed a much higher affinity to amino groups than to hydroxy and carboxy groups. In contrast, polyethylene glycol (molecular mass 4000 Da), one part of the ALD and a previously reported enzymatic saccharification enhancer, did not adsorb onto any enzymes in the cellulase cocktail or the amino group. Size exclusion chromatography demonstrated that the ALDs formed self-aggregates in both water and chloroform; the formation process in the latter was especially unique. Therefore, we conclude that the high residual cellulase activity is attributed to the direct association of ALD aggregates with the CBH group.
  • Ligninolytic Activity at 0 °C of Fungi on Oak Leaves Under Snow Cover in a Mixed Forest in Japan
    浦木 康光
    Microbial Ecology 74 2 322 - 331 2017年02月 [査読有り][通常論文]
  • Xiangyu You, Junlei Duan, Keiichi Koda, Tatsuhiko Yamada, Yasumitsu Uraki
    HOLZFORSCHUNG 70 7 661 - 671 2016年07月 [査読有り][通常論文]
     
    Electrodes has been prepared for application in an electric double layer capacitor (EDLC) based on polyethylene glycol lignin (PEGL) and soda lignin (SL) derived from cedar wood. Fibers with a diameter of 23 mu m were prepared by direct melt electrospinning of PEGL. Much finer fibers of 3.6 mu m diameter were obtained by dry electrospinning of 70% PEGL in a dimethyl formamide (DMF) solution at 145 degrees C. The dry electrospinning of SL alone in an alkaline aqueous solution was not achievable, but this was possible of a mixture of SL and polyethylene glycol (M-w = 500 000) at a ratio of 99/1, which resulted in thin SL fibers with a diameter of 0.85 mu m. These fibers were converted into activated carbon fibers (ACFs) by thermostabilization, carbonization, and steam activation. The specific Brunauer, Emmett and Teller (BET) surface areas of the resulting PEGL-ACFs and SL-ACFs were 1880 m(2) g(-1) and 1411 m(2) g(-1), respectively. PEGL-ACFs electrodes with an organic electrolyte exhibited an impedance of 1.6 Omega and a specific capacitance of 92.6 F g(-1) at a scan rate of 1 A g(-1), and the SL-ACFs electrodes had an impedance and specific capacitance of 4.5 Omega and 55.6 F g(-1), respectively.
  • Xiangyu You, Keiichi Koda, Tatsuhiko Yamada, Yasumitsu Uraki
    JOURNAL OF WOOD CHEMISTRY AND TECHNOLOGY 36 6 418 - 431 2016年 [査読有り][通常論文]
     
    Activated carbon fibers (ACFs) with large surface area were easily prepared from melt-spun fibers of polyethylene glycol lignin (PEGL). To fabricate electric double-layer capacitors (EDLCs) with a wide potential window and a high energy density in an EDLC package, electrodes (mainly composed of ACFs) were internally laminated and connected in series, in parallel, or in a series/parallel combination. Such resultant EDLCs are termed internal tandem (IT) EDLCs. As expected, the potential window was expanded by the series connection, and the capacitance was increased by the parallel connection. As a result, the energy density in the parallel-connected EDLC was remarkably increased by 66% (16.6 Wh kg(-1)) compared with that of a single-cell EDLC. The EDLC with the combination connection showed both advantages. Thus, based on the package weight, the electrochemical performance of the EDLCs was remarkably improved by the IT-type lamination of electrodes.
  • Xiangyu You, Keiichi Koda, Tatsuhiko Yamada, Yasumitsu Uraki
    JOURNAL OF WOOD CHEMISTRY AND TECHNOLOGY 36 6 418 - 431 2016年 [査読有り][通常論文]
     
    Activated carbon fibers (ACFs) with large surface area were easily prepared from melt-spun fibers of polyethylene glycol lignin (PEGL). To fabricate electric double-layer capacitors (EDLCs) with a wide potential window and a high energy density in an EDLC package, electrodes (mainly composed of ACFs) were internally laminated and connected in series, in parallel, or in a series/parallel combination. Such resultant EDLCs are termed internal tandem (IT) EDLCs. As expected, the potential window was expanded by the series connection, and the capacitance was increased by the parallel connection. As a result, the energy density in the parallel-connected EDLC was remarkably increased by 66% (16.6 Wh kg(-1)) compared with that of a single-cell EDLC. The EDLC with the combination connection showed both advantages. Thus, based on the package weight, the electrochemical performance of the EDLCs was remarkably improved by the IT-type lamination of electrodes.
  • Xiangyu You, Keiichi Koda, Tatsuhiko Yamada, Yasumitsu Uraki
    HOLZFORSCHUNG 69 9 1097 - 1106 2015年11月 [査読有り][通常論文]
     
    Lignin-based activated carbon fibers (ACFs) were prepared by electrospinning of hardwood acetic acid lignin (HW-AAL) solution followed by thermostabilization, carbonization, and steam activation. The thermostabilization process was able to be remarkably shortened from 38 h to 3 h with hexamethylenetetramine (hexamine) in binary solvents, AcOH/CCl4 (8/2), when compared with conventional thermostabilization processes. The resultant ACFs possessed higher specific surface area (2185 m(2) g(-1)) than those from commercial activated carbon and electrospun lignin fibers without hexamine. These ACFs also exhibited good electrical capacitance (133.3 F g(-1) at a current density of 1 A g(-1)) as electrodes of electric double layer capacitor (EDLC) are efficient not only due to their large surfaces area but also due to their porous structure with well-developed micropores (diameter: 0.5-1.3 nm). High energy density and power density of this EDLC (42 Wh kg(-1) and 91 kW kg(-1), respectively) were also achieved.
  • Qiang Li, Keiichi Koda, Arata Yoshinaga, Keiji Takabe, Masatsugu Shimomura, Yuji Hirai, Yutaka Tamai, Yasumitsu Uraki
    JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 63 18 4613 - 4620 2015年05月 [査読有り][通常論文]
     
    To elucidate the influence of wood polysaccharide components on lignin formation in vitro, models for polysaccharide matrix in wood secondary cell wall were fabricated from two types of bacterial cellulosic films, flat film (FBC) and honeycomb-patterned film (HPBC), as basic frameworks by depositing xylan onto the films. An endwise type of dehydrogenative polymerization, Zutropfverfahren, of coniferyl alcohol was attempted in the films with/without xylan. The resultant dehydrogenation polymer (DHP) was generated inside and outside xylan-deposited films, whereas DHP was deposited only outside the films without xylan. The amount of the generated DHP in the xylan-deposited films was larger than that in the films without xylan. The frequency of 8-O-4' interunitary linkage in DHP was also increased by the xylan deposition. These results suggest that xylan acts as a scaffold for DHP deposition in polysaccharides matrix and as a structure regulator for the formation of the 8-O-4' linkage. In addition, mechanical properties, i.e., tensile strength and modulus of elasticity (MOE), of both cellulosic films were found to be augmented by the deposition of xylan and DHP. Especially, DHP deposition remarkably enhanced MOE. Such effects of xylan on DHP formation and augmentation of mechanical strength were clearly observed for HPBC, revealing that HPBC is a promising framework model to investigate wood cell wall formation in vitro.
  • Kukjin Yoon, Shiho Takahashi, Thi Thi Nge, Olov Karlsson, Akiko Nakagawaizumi, Hiroshi Ohi, Yasumitsu Uraki, Tatsuhiko Yamada
    BIORESOURCES 10 1 912 - 921 2015年 [査読有り][通常論文]
     
    Softwood lignin prepared by soda-anthraquinone (AQ) cooking does not have thermal melting characteristics. To improve the properties of softwood soda-AQ lignin, we have invented a new method of lignin modification using dried black liquor powder by a spray dryer system and polyethylene glycol (PEG). In this process, black liquor powder was directly treated with PEG under alkaline conditions to produce PEG-modified lignin (alkaline PEG treatment). Dried black liquor powder prepared by a spray dryer was dissolved into PEG and heated at either 120 or 160 degrees C at atmospheric pressure. The modified lignin (alkaline PEG-treated lignin) was precipitated with acid and recovered by filtration. The alkaline PEG-treated lignin showed adequate thermal melting characteristics. The treatment temperature and the molecular weights of PEG considerably affected the thermal properties of the alkaline PEG-treated lignin. There was an addition reaction of the PEG to the lignin hydroxyl group at the alpha-(alpha-) carbon. However, in the acid precipitation step, if the mixture was allowed to set unfiltered for a long time, the PEG bonded with the lignin was hydrolyzed, which yielded the original soda-AQ lignin and PEG polymer.
  • Shiho Takahashi, Shuji Hosoya, Masami Hattori, Masakazu Morimoto, Yasumitsu Uraki, Tatsuhiko Yamada
    JOURNAL OF WOOD CHEMISTRY AND TECHNOLOGY 35 5 348 - 354 2015年 [査読有り][通常論文]
     
    We have developed a high-performance lignin-based water-reducing admixture. In this study, softwood soda-anthraquinone lignin was modified with mono-epoxide polyethylene glycols having chain lengths of 10, 25, and 50 mol (the number of repeating units of ethylene oxide). The mortar flow and concrete slump flow tests were used to investigate the performance of the lignin derivatives as a water-reducing admixture. All tested lignin-PEG derivatives performed considerably better than a commercial lignosulfonate water-reducing admixture in the mortar flow test. In particular, the derivative with a PEG chain length of 50 mol performed excellently in both tests. The optimum PEG content for mortar dispersion was approximately 40% for lignin derivatives with a PEG chain length of 50 mol; this content exhibited a dispersing effect that was four times higher than that of the lignosulfonate water-reducing admixture. The strength of concrete containing the lignin derivatives was almost the same strength as that of concrete containing the commercial lignosulfonate water-reducing admixture.
  • Ningning Cheng, Yoko Yamamoto, Keiichi Koda, Yutaka Tamai, Yasumitsu Uraki
    BIORESOURCE TECHNOLOGY 173 104 - 109 2014年12月 [査読有り][通常論文]
     
    Amphipathic lignin derivatives (A-LDs) were already demonstrated to improve enzymatic saccharification of lignocellulose. Based on this knowledge, two kinds of A-LDs prepared from black liquor of soda pulping of Japanese cedar were applied to a fed-batch simultaneous saccharification and fermentation (SSF) process for unbleached soda pulp of Japanese cedar to produce bioethanol. Both lignin derivatives slightly accelerated yeast fermentation of glucose but not inhibited it. In addition, ethanol yields based on the theoretical maximum ethanol production in the fed-batch SSF process was increased from 49% without A-LDs to 64% in the presence of A-LDs. (C) 2014 Elsevier Ltd. All rights reserved.
  • Ina Winarni, Keiichi Koda, Totok K. Waluyo, Gustan Pari, Yasumitsu Uraki
    JOURNAL OF WOOD CHEMISTRY AND TECHNOLOGY 34 3 157 - 168 2014年07月 [査読有り][通常論文]
     
    The aim of this research is to develop an enzymatic saccharification process of sago starch waste, with a small charge of cellulase. The waste contained a significant amount of residual starch, which was recovered as glucose by mild acid hydrolysis. The starch-free residue was subjected to soda-anthraquinone pulping to yield soda pulp and soda lignin. The lignin was converted to amphipathic lignin derivatives by the reaction with epoxylated polyethylene glycol analogues. The pulp was hydrolyzed with cellulase (Genencor GC220), with the amphipathic derivatives, to yield glucose. The lignin derivative-assisted, enzymatic saccharification was repeatedly conducted by reusing cellulase recovered by ultrafiltration from saccharification media. Saccharification efficiency with the derivatives was maintained at a high level even after the fourth run of saccharification, while the efficiency was remarkably decreased by repeated use of cellulase without additive. Thus, the amphipathic sago lignin derivatives enabled repeated use of cellulase for saccharification of sago starch waste.
  • Jian Lin, Keiichi Koda, Satoshi Kubo, Tatsuhiko Yamada, Makiko Enoki, Yasumitsu Uraki
    JOURNAL OF WOOD CHEMISTRY AND TECHNOLOGY 34 2 111 - 121 2014年06月 [査読有り][通常論文]
     
    PEG-lignin fibers obtained by a solvolysis pulping of Japanese cedar with polyethylene glycol (PEG) 400 were successfully converted into defective-free, infusible fibers as a precursor for carbon fibers (CFs) by chemical curing followed by oxidative thermostabilization. The curing was performed by immersing PEG-lignin fibers in an aqueous mixed solution of hexamethylenetetramine (60g/L) and hydrochloric acid (3M) at 85 degrees C for 1h, resulting in the formation of crosslinkages between lignin molecules through methylene groups. These cured fibers were completely thermostabilized upon heating up to 250 degrees C at a heating rate of 2 degrees C/min under an air atmosphere. Finally, the thermostabilized fibers were carbonized to yield CFs, which showed about 1.5times the tensile strength of our CFs previously prepared.
  • Ina Winarni, Chihiro Oikawa, Tatsuhiko Yamada, Kiyohiko Igarashi, Keiichi Koda, Yasumitsu Uraki
    BIORESOURCES 8 2 2195 - 2208 2013年 [査読有り][通常論文]
     
    Synthesized amphipathic lignin derivatives comprised of acidic acid lignin (AL) with poly(ethylene glycol) diglycidyl ether (PEGDE), ethoxy-(2-hydroxy)-propoxy-poly(ethylene glycol) glycidyl ether (EPEG) or dodecyloxy-poly(ethylene glycol) glycidyl ether (DAEO) were added before the enzymatic saccharification of unbleached cedar pulp along with two commercially available cellulases, Meicelase and Genencor GC220. At the same filter paper unit (FPU) dosage, GC220 showed higher sugar yield than Meicelase. The difference was attributed to the composition of processive and non-processive endoglucanase activities per FPU; GC220 had higher such activities than Meicelase. The sugar yield was significantly improved by the addition of the lignin derivatives. In addition, residual activities after the saccharification were maintained at the higher level by their addition than with polyethylene glycol (PEG) 4000. In particular, EPEG-AL yielded the complete recovery of cellulase activity when using 20 FPU/g of substrate. It was found that the lignin derivatives were directly associated with Cel6A, one of cellulase components, whereas PEG 4000 was not. Thus, it is evident that the lignin derivatives are promising agents to improve the enzymatic saccharification of cellulase.
  • 浦木 康光
    Biomacromolecules 13 3 867 - 872 2012年03月 [査読有り][通常論文]
     
    Several lignin model polymers and their derivatives comprised exclusively of beta-O-4 or 8-O-4' interunitary linkages were synthesized to better understand the relation between the thermal mobility of lignin, in particular, thermal fusibility and its chemical structure; an area of critical importance with respect to the biorefining of woody biomass and the future forest products industry. The phenylethane (C6-C2)-type lignin model (polymer 1) exhibited thermal fusibility, transforming into the rubbery/liquid phase upon exposure to increasing temperature, whereas the phenylpropane (C6-C3)-type model (polymer 2) did not, forming a char at higher temperature. However, modifying the C gamma or 9-carbon in polymer 2 to the corresponding ethyl ester or acetate derivative imparted thermal fusibility into this previously infusible polymer. FT-IR analyses confirmed differences in hydrogen bonding between the two model lignins. Both polymers had weak intramolecular hydrogen bonds, but polymer 2 exhibited stronger intermolecular hydrogen bonding involving the C gamma-hydroxyl group. This intermolecular interaction is responsible for suppressing the thermal mobility of the C6-C3-type model, resulting in the observed infusibility and charring at high temperatures. In fact, the C gamma-hydroxyl group and the corresponding intermolecular hydrogen bonding interactions likely play a dominant role in the infusibility of most native lignins.
  • Masato Ogawa, Teuku B. Bardant, Yasutaka Sasaki, Yutaka Tamai, Seiichi Tokura, Yasumits Uraki
    BIORESOURCES 7 1 236 - 245 2012年 [査読有り][通常論文]
     
    Activated carbons (ACs) were prepared from biomass of Borneo island (wood charcoal, peat, and coconut husk) by using an electricity-free furnace, of which the energy source was exclusively wood charcoal. This furnace was comprised of two parts, an inner vessel equipped with water inlet for steam activation and an outer shell as a heating part for the inner vessel. The inside temperature of the inner vessel was able to reach over 1000 degrees C. Peat and wood charcoal were converted to AC by carbonization followed by steam activation, and the specific BET surface areas of resultant ACs were 889 m(2)/g and 749 m(2)/g, respectively. A mobile apparatus for water purification was newly designed and fabricated with the resultant AC, together with a white quartz sand, which is called keranggas in Kalimantan. The CODOH of both polluted creek water by the University of Palangka Raya and Kahayan River water were remarkably decreased by the purification with the designed apparatus from 20.0 mgO/L to 0.93 mgO/L, and 18.2 mgO/L to 0.74 mgO/L, respectively. Thus, the newly designed furnace and purification apparatus were shown to be highly effective tools to produce a promising agent for water purification and to produce clarified water without use of electricity, respectively.
  • Jian Lin, Satoshi Kubo, Tatsuhiko Yamada, Keiichi Koda, Yasumitsu Uraki
    BIORESOURCES 7 4 5634 - 5646 2012年 [査読有り][通常論文]
     
    A thermally fusible softwood lignin was directly isolated by a solvolysis of cedar wood chips with a mixture of polyethylene glycol 400 (PEG 400) and sulfuric acid. Its fusibility was found to be due to a PEG moiety introduced into the lignin by the solvolysis. The lignin was easily formed into fibers by melt-spinning at temperatures ranging from 145 to 172 degrees C without any modification. The lignin fibers could be converted into infusible fibers as a precursor for carbon fibers (CFs) by conventional oxidative thermal stabilization processing in air or a stream of oxygen for 2 days. We found that the infusible fibers resulted from the partial cleavage of the PEG moiety from the lignin fibers after treatment with 6 M hydrochloric acid at 100 degrees C for 2 h. The infusible fibers were converted into CFs with a tensile strength of 450 MPa by carbonization at 1000 degrees C under a N-2 stream.
  • Novel functions of nonionic amphiphilic derivatives
    浦木 康光
    ACS Syposium Series 1107 253 - 254 2012年 [査読有り][通常論文]

書籍

  • 木質の化学
    文永堂出版 2010年
  • 「機能性リグニン-多糖複合体の開発」
    シーエムシー出版 2007年
  • Development of functional lignin-carbohydrate complex
    CMC Publisher 2007年

その他活動・業績

  • Masato Ogawa, Teuku B. Bardant, Yasutaka Sasaki, Yutaka Tamai, Seiichi Tokura, Yasumits Uraki BIORESOURCES 7 (1) 236 -245 2012年 [査読無し][通常論文]
     
    Activated carbons (ACs) were prepared from biomass of Borneo island (wood charcoal, peat, and coconut husk) by using an electricity-free furnace, of which the energy source was exclusively wood charcoal. This furnace was comprised of two parts, an inner vessel equipped with water inlet for steam activation and an outer shell as a heating part for the inner vessel. The inside temperature of the inner vessel was able to reach over 1000 degrees C. Peat and wood charcoal were converted to AC by carbonization followed by steam activation, and the specific BET surface areas of resultant ACs were 889 m(2)/g and 749 m(2)/g, respectively. A mobile apparatus for water purification was newly designed and fabricated with the resultant AC, together with a white quartz sand, which is called keranggas in Kalimantan. The CODOH of both polluted creek water by the University of Palangka Raya and Kahayan River water were remarkably decreased by the purification with the designed apparatus from 20.0 mgO/L to 0.93 mgO/L, and 18.2 mgO/L to 0.74 mgO/L, respectively. Thus, the newly designed furnace and purification apparatus were shown to be highly effective tools to produce a promising agent for water purification and to produce clarified water without use of electricity, respectively.
  • Yasumitsu Uraki, Yutaka Tamai, Takuro Hirai, Keiichi Koda, Hiroshi Yabu, Masatsugu Shimomura MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS 31 (6) 1201 -1208 2011年08月 [査読無し][通常論文]
     
    Wood cell wall, composed of polysaccharides (cellulose and hemicelluloses) and an aromatic polymer (lignin), exhibits a honeycomb-like alignment. We have been making attempts to fabricate cellulose-based materials to reconstruct these wood components artificially, mimicking their formation processes. Those attempts are aiming not only at better understanding of the significance and the function of each wood component, but also at providing a novel, biomass-based polymer material with functionality. This article outlines a protocol to prepare honeycomb-patterned cellulose films with two different polymorphisms, carrying different pore sizes, as a basic framework of the artificial cell wall structure. It also illustrates the effect of the presence of hemicellulose and lignin on the physical property of the honeycomb-patterned cellulose films, when they were adsorbed onto the films. (C) 2010 Elsevier B.V. All rights reserved.
  • Yasumitsu Uraki, Harumi Homma, Chihiro Oikawa, Tomohiro Aso, Keiichi Koda 16TH INTERNATIONAL SYMPOSIUM ON WOOD, FIBER AND PULPING CHEMISTRY, PROCEEDINGS, VOLS I & II 165 -169 2011年 [査読無し][通常論文]
     
    We have developed a conversion method of isolated lignins to amphiphiles with three polyethylene glycol (PEG) analogues bearing epoxy groups, termed as PEGDE, EPEG and DAEO. These lignin-based amphiphiles showed significant surface activity. DAEO-derivative revealed the highest activity as comparable to Triton X-100, commercially available nonionic surfactant. We found another useful application of these lignin-based amphiphiles in addition to its utilization as a surfactant. When the amphipiles were added to pulp suspension in a buffered solution together with cellulase, the enzymatic saccharification yields were significantly improved and residual cellulase activity after the saccharification was maintained at higher levels than that without the amphiphiles. EPEG-derivative indicated the highest residual activity. These results suggest that the lignin-based amphiphiles can be used as a cellulase-aid agent, leading to reduction of saccharification cost. EPEG and DAEO-derivatives are also found to act as a cement admixture, which was known to reduce the amount of water used for well dispersing cement, and was very often produced from lignosulfates. These derivatives showed a superior dispersibility for cement to lignosulfates in spite of the fact that it is a nonionic surfactant. In addition, such the derivatives could be prepared directly from black liquor of kraft pulping by one step reaction without isolation of kraft lignin from the black liquor. Thus, a new type cement dispersant or admixture, as well as cellulase-aid agent, was readily prepared from isolated lignins, such as kraft lignin and organosolv lignins, by our developed modification method-with PEG analogues.
  • ホットメルトするリグニン
    ホットメルト材料および装置、製品の最新技術と使い方ノウハウ 78 -82 2011年 [査読無し][通常論文]
  • Keiichi Koda, Satoshi Kubo, Yasumitsu Uraki ACS Symposium Series 1067 261 -277 2011年 [査読無し][通常論文]
     
    Development of low-cost, value-added bio-materials from technical lignins is essential in terms of complete utilization of woody biomass components (biorefining). A simply designed chemical modification may provide technical lignins with some unique properties: thermal fusibility, thermal moldability, amphiphilicity, and miscibility with synthetic polymers. Here, the fundamental characteristics of technical lignins are first overviewed. Second, recent progress in chemical modification of technical lignins for industrial application is reviewed. Finally, newly developed lignin-containing materials with functionality are discussed. © 2011 American Chemical Society.
  • Thermal fusible lignin
    78 -82 2011年 [査読無し][通常論文]
  • Yasumitsu Uraki, Chinatsu Matsumoto, Takuro Hirai, Yutaka Tamai, Makiko Enoki, Hiroshi Yabu, Masaru Tanaka, Masatsugu Shimomura JOURNAL OF WOOD CHEMISTRY AND TECHNOLOGY 30 (4) 348 -359 2010年 [査読無し][通常論文]
     
    We have already fabricated honeycomb-patterned cellulosic films with cellulose I and II polymorphisms as a basal framework in order to create an artificial woody cell wall.[1,2] The adsorption of an isolated lignin, acetic acid lignin (AL), was attempted onto the honeycomb films not only to develop materials further mimicking the cell wall but also to elucidate the mechanical effect of isolated lignin on the tensile strength of the cellulosic architecture. The tensile strengths of honeycomb-patterned cellulosic films were improved by the AL adsorption. Although the cellulosic films without lignin weakened under high moisture content conditions as compared with those under the low content conditions, the lignin-adsorbed cellulosic film maintained significant tensile strength even under the high content conditions. This result suggests that lignin contributes to reinforce the mechanical strength of cellulose framework, in particular high moisture conditions.
  • Yuka Tasaki, Yasumitsu Uraki, Keiichi Koda, Sadaaki Yamamoto, Hiroshi Yabu, Masatsugu Shimomura RESEARCH PROGRESS IN PAPER INDUSTRY AND BIOREFINERY (4TH ISETPP), VOLS 1-3 3 1465 -1468 2010年 [査読無し][通常論文]
     
    Honeycomb-patterned cellulose films were prepared, and coated with arabinogalactan, a larch hemicellulose. An application of the hemicellulose-coated, honeycomb-patterned cellulose films was proposed. First, we attempted to control the pore sizes of honeycomb-patterned bacterial cellulose (HPBC) films. HPBC films with pore sizes of 10, 15, and 20 mu m were successfully fabricated, but the one with a pore size of 5 mu m was not. Second, we evaluated the applicability of the arabinogalactan-coated, honeycomb-patterned regenerated cellulose (HPRC) films to scaffolds for hepatocyte culture. It was observed that the arabinogalactan-coated HPRC films had a unique adhesion of hepatocyte: formation of spheroid-like structure and insertion of individual globular cells each in the honeycomb pores.
  • Chihiro Oikawa, Keiichi Koda, Yasumitsu Uraki, Masanobu Nojiri, Tatsuhiko Yamada, Kiyohiko Igarashi RESEARCH PROGRESS IN PAPER INDUSTRY AND BIOREFINERY (4TH ISETPP), VOLS 1-3 2 1306 -1309 2010年 [査読無し][通常論文]
     
    An effective cellulase-aid agent has to be developed to establish an efficient saccharification system for bioethanol production from huge piles of unused, lignocellulosic biomass. We have successfully developed some types of lignin derivatives that enhance the efficiency of enzymatic hydrolysis of unbleached pulp with cellulase and help to maintain its original activity after repeated use. These cellulase-aid agents were prepared by the conversion of acetic acid lignin into amphiphilic derivatives with polyethylene glycol-related compounds.
  • Yasumitsu Uraki, Keiichi Koda, Takao Kishimoto, Satoshi Kubo RESEARCH PROGRESS IN PAPER INDUSTRY AND BIOREFINERY (4TH ISETPP), VOLS 1-3 1 315 -318 2010年 [査読無し][通常論文]
     
    We have first found that hardwood acetic acid lignin (HAL), one of organosolv lignins, had fusibility, which had never reported for other isolated lignins. HAL can be transformed into fibers by melt spinning, and then carbon fibers and activated carbon fibers by heat treatments. Kubo and his colleagues successfully prepared fibers by melt spinning from a hardwood organosolv lignin and a hardwood kraft lignin. The moldability of these lignins was attributed to fusibility of isolated lignins. However, the relationship between the presence of beta-O-4 bond, the major interunitary linkage of lignin, and its fusibility was not elucidated. We investigated the relationship, using artificially synthesized lignin polymers consisting exclusively of beta-O-4 bond having phenylpropane guaiacyl moiety. As a result, the model polymer was not transformed into a molten state, although it showed a glass transition. It was found, from FT-IR measurement with variable temperature mode, that its molecular motion was suppressed by the formation of intermolecular hydrogen bonding of a primary hydroxyl group at gamma-position. Therefore, the fusibility of organosolv lignins was attributed to the modification of primary hydroxyl group with the cooking solvents used for the pulping processes.
  • テウク ・ベウナ・バルダント, 及川 千皓, 野尻 昌信, 幸田 圭一, ヤニ ・スディヤニ, 山田 竜彦, 浦木 康光 木材学会誌 56 (6) 420 -426 2010年 [査読無し][通常論文]
  • Takao Kishimoto, Wakako Chiba, Kaori Saito, Kazuhiko Fukushima, Yasumitsu Uraki, Makoto Ubukata JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 58 (2) 895 -901 2010年01月 [査読無し][通常論文]
     
    Several kinds of natural woods and isolated lignins with various syringyl to guaiacyl (S/G) ratios were subjected to thioacidolysis followed by Raney nickel desulfuration to elucidate the relationships between the S/G ratio and the interunit linkage types of lignin. Furthermore, enzymatic dehydrogenation polymers (DHP) were produced by the Zutropf (gradual monolignol addition) method from mixtures of various ratios of coniferyl alcohol and sinapyl alcohol. The analysis of DHPs and natural wood lignins exhibited basically a similar tendency. The existence of both syringyl and guaiacyl units is effective for producing higher amounts of beta-O-4 and 4-O-5 structures, but it lowers the total amount of cinnamyl alcohol and aldehyde end groups. The relative frequency of the beta-beta structure increased, whereas that of beta-5 and 5-5 structures decreased with increasing syringyl units.
  • Harumi Homma, Satoshi Kubo, Tatsuhiko Yamada, Keiichi Koda, Yasuyuki Matsushita, Yasumitsu Uraki JOURNAL OF WOOD CHEMISTRY AND TECHNOLOGY 30 (2) 164 -174 2010年 [査読無し][通常論文]
     
    To make use of technical lignins as a nonionic polymeric surfactant, we have already reported the modification of acetic acid lignin (AL) to amphiphilic derivatives by polyoxyethylation using two types of polyethylene glycol (PEG) with diglycidyl (PEGDE) and monoglycidyl (EPEG) groups.[1] Kraft lignin (KL) was converted to amphiphiles in a similar manner. The resultant KL derivatives also indicated high surface activity. Polyethylene glycol with long alkyl chain was introduced to AL, KL, and lignosulfonate (LS) to prepare surfactants of high performance, using dodecyloxy-polyethylene glycol glycidyl ether (DAEO). The resultant DAEO-derivatives showed lower critical micelle concentration by 2-4 orders of magnitude than the corresponding PEGDE- and EPEG-derivatives. The DAEO-derivatives from LS showed better dispersibility for gypsum paste, one of cement components, than LS.
  • Teuku Beuna Bardant, Chihiro Oikawa, Masanobu Nojiri, Keiichi Koda, Yanni Sudiyani, Tatsuhiko Yamada, Yasumitsu Uraki MOKUZAI GAKKAISHI 56 (6) 420 -426 2010年 [査読無し][通常論文]
     
    A huge amount of lignocellulosic wastes are disposed on an industrial scale as unused biomass both in Japan and in Southeast Asia : including forest thinnings of Japanese cedar wood and empty fruit bunches (EFB) of the oil palm tree. Supposing the production of platform compounds from such unused biomass through enzymatic saccharification, we have developed a cellulase-aid agent by the conversion of acetic acid lignin into an amphiphilic derivative (PE-AL). EFB pulps with 1096 and 12% residual lignin and cedar pulp with 11% residual lignin were prepared by kraft and soda pulping processes, respectively, as a pretreatment of enzymatic saccharification. An addition of PE-AL significantly improved the saccharification yield of the cedar pulp, while it improved those of EFB pulps dramatically. After the enzymatic saccharification, the cellulase activity remained in the presence of PEAL, although no activity was detected in the absence of PE-AL.
  • Yasumitsu Uraki, Yutaka Tamai, Masato Ogawa, Sampang Gaman, Seiichi Tokura BIORESOURCES 4 (1) 205 -213 2009年02月 [査読無し][通常論文]
     
    Peat with an approximate 60% carbon content collected in the suburbs of Palangka Raya, Indonesia, was carbonized, followed by activation with steam in an electric furnace. The resultant activated carbon (AC) had ca. 900 m(2)/g of BET surface area and 1000 mg/g of iodine adsorption. This performance implies that this AC can be used as an adsorbent for environmental purification. We had a carbonizing furnace manufactured in Palangka Raya, which did not require electric power. Some AC having 350 mg/g of iodine adsorption was obtained by using this furnace. Although the adsorption ability was much lower than that of commercially available AC, the AC achieved significant decoloration and decrease in chemical oxygen demand of polluted river water. Thus, this article demonstrated the potential of tropical peat soil as a source of AC.
  • CRYSTALLINITY OF POLYETHYLENE GLYCOL CHAINS ANCHORED ON LIGNIN MOLECULES
    15th International Symposium of Wood, Fiber and Pulping Chemistry P-170 2009年 [査読無し][通常論文]
  • CONVERSION OF ACETIC ACID LIGNIN TO A NONIONIC POLYMERIC SURFACTANT
    15th International Symposium of Wood, Fiber and Pulping Chemistry P-163 2009年 [査読無し][通常論文]
  • CLEAVAGE OF ETHEREAL BONDS IN LIGNIN STRUCTURE WITH ALUMINIUM IODIDE (III) -FORMATION OF CATECHOL MOIETIES FROM GUAIACYL UNITS
    15th International Symposium of Wood, Fiber and Pulping Chemistry P-042 2009年 [査読無し][通常論文]
  • INFLUENCE OF SYRINGYL-TOGUAIACYL RATIO ON THE STRUCTURE OF LIGNIN
    15th International Symposium of Wood, Fiber and Pulping Chemistry P-002 2009年 [査読無し][通常論文]
  • CREATION OF ARTIFICIAL CELL WALL BY USING HONEYCOMB-PATTERNED CELLULOSE.
    Proceedings of International Conference on Pulping, papermaking and Biotechnology O-054 2009年 [査読無し][通常論文]
  • URAKI Yasumitsu, KISHIMOTO Takao, KODA Keiichi, FUKUSHIMA Kazuhiko, KANAZAWA Yoshie . Journal of Wood Chemistry and Technology 29 (2) 178 -190 2009年 [査読無し][通常論文]
     
    Dimeric lignin model compounds with non-phenolic and phenolic moieties and a -O-4 type artificial lignin polymer were subjected to thioacidolysis to evaluate the reaction efficiency of thioacidolysis for cleavage of -O-4 interunitary linkage. The obtained yields of thioethylated monomeric products from the dimeric lignin model compounds reached nearly 100% under the conventional condition, whereas that from the artificial lignin polymer was as low as 74%. Neither prolonged reaction time nor increased concentration of ethanethiol (the thioacidolysis reagent) enhanced the resulting monomer yields from the polymer (69-79%). Thioacidolysis of the lignin model compounds followed by HPSEC analysis also showed the dimeric model compounds were degraded almost quantitatively, but that the artificial lignin polymer was not. Thioacidolysis followed by desulfurization gave at least one dimeric product resulting from incomplete -O-4 cleavage at significant yield. These results suggested the conventional thioacidolysis could not achieve quantitative cleavage of -O-4 linkages in lignin macromolecules.
  • Takao Kishimoto, Yasumitsu Uraki, Makoto Ubukata ORGANIC & BIOMOLECULAR CHEMISTRY 6 (16) 2982 -2987 2008年08月 [査読無し][通常論文]
     
    We describe the synthesis and NMR spectroscopic analysis of three artificial lignin polymers containing only the beta-O-4 substructure: syringyl-type homopolymer, p-hydroxyphenyl-type homopolymer and guaiacyl/syringyl-type heteropolymer. Using gel permeation chromatography, the weight-average degree of polymerization (DPw) of the three polymers was determined as 19.2. 38.6, and 13.9, respectively. The polymers were prepared based on the synthetic methodology of guaiacyl-type homopolymer, and were fully characterized using H-1-, C-13-, and H-1-C-13 NMR spectroscopy of the acetylated and non-acetylated forms. The spectra of guaiacyl/syringyl-type heteropolymers were in good agreement with those of the beta-O-4 substructure of milled wood lignin obtained from the hardwood of Japanese white birch.
  • Md. Ibrahim H. Mondal, Yasumitsu Uraki, Makoto Ubukata, Koki Itoyama CELLULOSE 15 (4) 581 -592 2008年08月 [査読無し][通常論文]
     
    The influence of treating cotton fibres with several amines on the mechanical properties, moisture sorption ability before and after graft polymerization, and on graft yields for various water-soluble and water-insoluble vinyl monomers were analysed. As compared to water, the treatment with amines, ethylenediamine (EDA) in particular, resulted in a decrease in the crystallinity and tensile strength of the cotton fibres, and an increase in the moisture sorption. The graft yields of amine-treated cotton fibres using water-soluble monomers, acrylic acid (AA), methacrylic acid (MAA) and acrylamide (AM) were greater than those observed for water-treated cotton fibres, whereas the graft yields using water-insoluble monomers, methyl acrylate (MA), methyl methacrylate (MMA) and vinyl acetate (VA) were lower. The moisture sorption ability was improved by the graft polymerization with water-soluble monomers. The improvement was enhanced for MA and MAA by treatment with sodium hydroxide to form the corresponding sodium carboxylate derivatives. The tensile strength of EDA-treated cotton was slightly reduced by grafting, while that of the water-activated cotton yarn was barely changed. These results suggest that the graft polymerization of amine-treated cotton fibres with certain vinyl monomers increased the moisture sorption ability without resulting in increased fibre rigidity.
  • Shinya Mitsuhashi, Takao Kishimoto, Yasumitsu Uraki, Takashi Okamoto, Makoto Ubukata Bioorganic and Medicinal Chemistry 16 (5) 2645 -2650 2008年03月 [査読無し][通常論文]
     
    Human immunodeficiency virus type 1 (HIV-1) is a cytopathic retrovirus and the primary etiological agent of acquired immunodeficiency syndrome (AIDS) and related disorders. In cells chronically infected with HIV-1, nuclear factor-kappa B (NF-kappa B) activation by external stimuli such as tumor necrosis factor alpha (TNF alpha) augments replication of HIV-1. NF-kappa B involves in many diseases such as inflammation, cancer, and. Crohn's disease. In this paper, we exhibit that (i) HIV-1 gene expression was inhibited by lignin, (ii) fraction of small molecular mass in HBS lignin (less than 0.5 kDa) had stronger inhibitory effects than large molecular mass (more than 1.3 kDa), (iii) lignin also inhibited activation of NF-kappa B induced by TNF alpha, (iv) among six lignin dimer-like compounds, compound 6 containing beta-5 bond has more potent inhibitory activity than compounds 1, 2, 3, 4 and 5, which contain beta-1, beta-O-4, 5-5, or beta-beta structural units. These results suggested that small molecules of lignin inhibit HIV-1 replication through suppression of HIV-1 transcription from LTR including activation via NF-kappa B. Low molecular lignin may be a beneficial material or drug leads as a new class for AIDS and NF-kappa B-related diseases. (C) 2008 Published by Elsevier Ltd.
  • Polymerization of coniferyl alcohol by chain reaction. Another reaction for lignin formation.
    Cellulose Chemistry and Technology 41 (9-10) 505 -509 2008年 [査読無し][通常論文]
  • Harumi Homma, Satoshi Kubo, Tatsuhiko Yamada, Yasuyuki Matsushita, Yasumitsu Uraki JOURNAL OF WOOD CHEMISTRY AND TECHNOLOGY 28 (4) 270 -282 2008年 [査読無し][通常論文]
     
    Acetic acid lignin (AL), one of the organosolv lignins, was modified by polyoxyethylation using commercially available polyethylene glycol diglycidylethers (PEGDE) having various chain lengths in order to generate novel nonionic polymeric surfactants. AL could be converted to the amphiphile by modifying with PEGDE (PEGDE-AL) having more than 9 of the ethylene oxide (EO) repeating units. Although the surface activities of PEG and AL were very limited, PEGDE-AL did strongly depress surface tension of water, and showed clear critical micelle concentrations (CMC). The CMC value of PEGDE-AL could be comparable to a commercial anionic lignin surfactant, lignosulfonate. The surface activity of AL amphiphile was further improved by modification with monoepoxides, ethoxy-(2-hydroxy)-propoxy-polyethylene glycol glycidylether (EPEGGE). The surface tension of water was depressed by the addition of the EPEGGE-AL to the same level as Triton X-100, which is a commercial PEG-based nonionic surfactant, although there is still room for improvement in CMC value. The hydrophile-lipophile balance (HLB) of these AL amphiphiles was in the range of 11-14, and significant biodegradation was observed. These results suggest that the AL amphiphiles can be used as emulsifier and detergent.
  • 榎牧子, 佐藤道佑, 金田航大, 関山亮太, 中川明子, 浦木康光, 兼廣春之 日本水産学会誌 74 (4) 688 -693 2008年 [査読無し][通常論文]
  • KISHIMOTO Takao, URAKI Yasumitsu, UBUKATA Makoto Journal of Wood Chemistry and Technology 28 (2) 97 -105 2008年 [査読無し][通常論文]
     
    Guaiacyl, syringyl, and p-hydroxyphenyl-type bromoacetophenone derivatives were synthesized as the starting materials for beta -O-4 type artificial lignin polymers. They were prepared from 4-hydroxyacetophenone instead of 4-hydroxybenzaldehyde, which was used in the previous investigations. The new route required 4 reaction steps. Overall yields of the monomers were 60, 79, and 68%, respectively.
  • Nippon Suisan Gakkaishi 74 (4) 688 -693 2008年 [査読無し][通常論文]
  • Yasumitsu Uraki, Junji Nemoto, Hiroyuki Otsuka, Yutaka Tamai, Junji Sugiyama, Takao Kishimoto, Makoto Ubukata, Hiroshi Yabu, Masaru Tanaka, Masatsugu Shimomura CARBOHYDRATE POLYMERS 69 (1) 1 -6 2007年05月 [査読無し][通常論文]
     
    Bacterial cellulose (BC)-producing bacterium, Gluconacetobacter xylinus (ATCC53582), was found to move along linear microgrooves of a stripe-patterned cellulosic scaffold. On the basis of this finding, fabrication of honeycomb-patterned BC was attempted by controlling the bacterial movement using a agarose film scaffold with honeycomb-patterned grooves (concave type). The patterned agarose film was prepared by three steps. The first was transcription of a honeycomb-patterned polycaprolactone film template with polydimethyl siloxane. When the bacteria were cultured on the scaffold under atmospheric conditions, only bacterial proliferation was observed. Honeycomb-patterned BC was obtained when cultured under a humid CO2 atmosphere. Electron diffraction and polarized microscopic observation showed that the patterned BC comprised of the well defined cellulose lot microfibrils. As another attempt to fabricate honeycomb-patterned BC, the bacteria were cultured on the patterned cellulose and agarose film with convex type of honeycomb. This culture yielded no honeycomb-patterned BC. Therefore, concave type honeycomb scaffold is more suitable to fabricate honeycomb-patterned BC. (c) 2006 Elsevier Ltd. All rights reserved.
  • Yasumitsu Uraki, Atsushi Nakamura, Takao Kishimoto, Makoto Ubukata JOURNAL OF WOOD CHEMISTRY AND TECHNOLOGY 27 (1) 9 -21 2007年 [査読無し][通常論文]
     
    Interactions of hemicelluloses, xylan and glucomannan, with monolignols, coniferyl alcohol and sinapyl alcohol, and their glucosides, coniferin and syringin, were investigated by surface plasmon resonance analysis. Hemicelluloses with different aldehyde contents, prepared by sodium periodate oxidation, were immobilized onto carboxymethyl-dextran-coated gold plates by reductive amination. The interaction of the hemicelluloses with monolignols was evaluated as weight gain of the hemicelluloses at neutral pH. Both hemicelluloses adsorbed the monolignols in much larger amounts than the corresponding glucosides. The adsorption tendency was independent of aldehyde content. These results suggest the hemicelluloses have higher affinities to the aglycons than the glucosides. Thus, the interactions of the hemicelluloses with monolignols are primarily the result of hydrophobic interactions. However, binding constants were not estimated because of the low solubility of the monolignols in the aqueous buffered solution.
  • Y Uraki, T Imura, T Kishimoto, M Ubukata CELLULOSE 13 (3) 225 -234 2006年06月 [査読無し][通常論文]
     
    The lower critical solution temperature (LCST) of hydroxypropylcellulose bearing lignin (HPC-L) prepared from unbleached pulp depends on the amount of residual lignin. An HPC-L gel having thermal properties reflective of original HPC-L was prepared using ethyleneglycol diglycidylether as a crosslinker, as previously reported [Uraki et al. (2004) Carbohydr. Polym. 58:123-130], and the volume transition temperature was detected as an endothermic peak by differential scanning calorimetry (DSC). The adsorption and release behavior of the guest molecules to/from this gel was then examined. When the adsorption of cationic and anionic guests was compared, cationic methylene blue (MB) was adsorbed in larger amounts than anionic methyl orange (MO). In addition, MB adsorption into the HPC-L gel was greater than MB adsorption into the HPC gel prepared from commercially available HPC. This suggests that residual lignin affects the adsorption of organic dyes. Significant differences were not observed with respect to the release of MB from HPC-L at 38 degrees C and lower temperatures. In the adsorption of surfactants, marked adsorption at around the critical micelle concentration of the ionic surfactants and gel swelling were observed. Such swelling did not occur in the aqueous nonionic surfactant solution, although the nonionic surfactant was adsorbed into the gel. Gel swelling may have been caused by the electrostatic repulsion of the ionic surfactants adsorbed onto the polymer chains within the gel structure.
  • Y Uraki, J Nemoto, Y Sano JOURNAL OF WOOD SCIENCE 52 (2) 163 -166 2006年04月 [査読無し][通常論文]
     
    We developed a novel method for preparation of microcasts of wood with silicone elastomer (polydimethylsiloxane; PDMS). PDMS was so flexible and elastic that it was possible to isolate the microcasts by simply pulling them out of the mold without digesting the cell wall after the resin was cured for 2 days at room temperature. The casts of some cell wall sculptures, such as spiral thickenings and bordered pits, had high fidelity. By contrast, the casts of distinctly bordered pits and tails of vessel elements were often deformed or broken. Bars of scalariform perforation plates were always torn and remained in the resin casts. The microcast preparation using PDMS is useful for easy investigation of cell wall sculptures. It might be also useful for microfractography of bars of scalariform perforation plates.
  • Yasumitsu Uraki, Yuriko Usukura, Takao Kishimoto, Makoto Ubukata HOLZFORSCHUNG 60 (6) 659 -664 2006年 [査読無し][通常論文]
     
    A lignin-carbohydrate complex (LCC) fraction isolated from the residue of milled wood lignin extraction of birch was found to form self-aggregates in water. The aggregates had relatively strong hydrophobic domains, comparable to the hydrophobicity of 80% ethanol. Dynamic light scattering analysis showed that the aggregates were transformed into small particles by sonication with a number-average diameter of 43.7 +/- 9.6 nm, and were stable in water. The surface pressure (pi)-surface area (A) profile showed that the LCC also formed a monolayer on the water surface. Based on these results, we suggest that the LCC is amphiphilic in nature, despite its insolubility in low-polarity organic solvents.
  • T Kishimoto, Y Uraki, M Ubukata ORGANIC & BIOMOLECULAR CHEMISTRY 4 (7) 1343 -1347 2006年 [査読無し][通常論文]
     
    An artificial lignin polymer containing only the beta-O-4 substructure was synthesized. The procedure consists of two key steps: 1) polycondensation of a brominated monomer by aromatic Williamson reaction; and 2) subsequent reduction of the carbonyl polymer. C-13-NMR and HMQC spectra of the polymer were consistent with beta-O-4 substructures in milled wood lignin isolated from Japanese fir wood. The weight average degree of polymerization (DPw) ranged from 19.5 to 30.6, which is comparable to enzymatically synthesized artificial lignin from p-hydroxycinnamyl alcohols ( dehydrogenation polymer, DHP) and some isolated lignins. Using this new lignin model polymer, it will now be possible to reinvestigate the properties and reactivity of the main lignin structure in terms of its polymeric character.
  • Investigation on interaction of hemicelluloses with monolignols using surface plasmon resonance
    Proceedings of 13th International Symposium on Wood, Fiber and Pulping Chemistry 3 277 -281 2005年 [査読無し][通常論文]
  • Preparation of intelligent gels with a body-temperature response from unbleached acetic acid pulp.
    Proceedings of 13th International Symposium on Wood, Fiber and Pulping Chemistry 2 545 -551 2005年 [査読無し][通常論文]
  • Preparation and chracterizaton of fiberboards from waste papers bonded by lignin.
    Proceedings of presimposium of 13th International Symposium on Wood, Fiber and Pulping Chemistry (1) 159 -163 2005年 [査読無し][通常論文]
  • T. Kishimoto, Y. Uraki and M. Ubukata: Easy synthesis of -O-4 type lignin related polymers. Org. Biomol. Chem., 3, 1067-1073 (2005).*
    2005年 [査読無し][通常論文]
  • J. Nemoto, Y. Uraki, T. Kishimoto, Y. Sano, R. Funada, N. Obata, H. Yabu, M. Tanaka, M. Shimomura: Production of mesocopically patterned cellulose film. Bioresource Tech., 96, 1955-1958 (2005).*
    2005年 [査読無し][通常論文]
  • Y. Uraki , J. Nemoto, K. Yanaga, A. Koizumi and T. Hirai: Preparation of board-like moldings from Composites of isolated lignins and waste paper II: Effect of inorganic salts addition on board performance and evaluation of practical use of MDF. J. Wood・・・
    2005年 [査読無し][通常論文]
     
    Y. Uraki , J. Nemoto, K. Yanaga, A. Koizumi and T. Hirai: Preparation of board-like moldings from Composites of isolated lignins and waste paper II: Effect of inorganic salts addition on board performance and evaluation of practical use of MDF. J. Wood Sci. 51, 589-594 (2005)*
  • “森林の科学-森林生態系科学入門-”<中村太士、小池孝良編著>
    朝倉書店 2005年 [査読無し][通常論文]
  • リグニンとセルロース系バイオマスから調製した種々の成形活性炭
    木質炭化学会誌 1 (1) 23 -29 2004年 [査読無し][通常論文]
  • Y. Uraki, T. Imura, T. Kishimoto and M. Ubukata: Body temperature-responsive gels derived from hydroxypropylcellulose bearing lignin. Carbohydr. Polym., 58、123-130 (2004).*
    2004年 [査読無し][通常論文]
  • T. Kishimoto, A. Ueki, H. Takamori, Y. Uraki, M. Ubukata: Delignification mechanism during high-boiling solvent pulping. Part 6: Changes in lignin structure analyzed by H-1-C-13 correlation 2-D NMR spectroscopy Source. Holzforschung, 58, 355-362 (2004).*
    2004年 [査読無し][通常論文]
  • T. Imura, Y. Uraki, T. Kishimoto and M. Ubukata: Thermoresponsive gels prepared from hydroxypropylated unbleached pulp. Proceeding of The 2nd International Symposium on Technologies of Pulping, Papermaking and Biotechnology on Fiber Plants, 595-528 (20・・・
    2004年 [査読無し][通常論文]
     
    T. Imura, Y. Uraki, T. Kishimoto and M. Ubukata: Thermoresponsive gels prepared from hydroxypropylated unbleached pulp. Proceeding of The 2nd International Symposium on Technologies of Pulping, Papermaking and Biotechnology on Fiber Plants, 595-528 (2004).
  • A. Nakamura, Y. Uraki, T. Kishimoto and M. Ubukata: Analysis of adsorption behavior of monolignols onto hemicellulose using surface plasmon resonance. Proceeding of The 2nd International Symposium on Technologies of Pulping, Papermaking and Biotechnolo・・・
    2004年 [査読無し][通常論文]
     
    A. Nakamura, Y. Uraki, T. Kishimoto and M. Ubukata: Analysis of adsorption behavior of monolignols onto hemicellulose using surface plasmon resonance. Proceeding of The 2nd International Symposium on Technologies of Pulping, Papermaking and Biotechnology on Fiber Plants, 521-524 (2004).
  • “木質系有機資源の新展開”<舩岡正光監修>
    シーエムシー 2004年 [査読無し][通常論文]
  • T. Kishimoto, H. Tsuji, Y. Uraki and Y. Sano: Ozone bleaching of atmospheric acetic acid pulp from Betula platyphylla var. japonica Hara. Holzforschung, 57, 181-188 (2003).*
    2003年 [査読無し][通常論文]
  • H. Sato, Y. Uraki, T. Kishimoto and Y. Sano: New process for producing cellulose acetate from wood in concentrated acetic acid. Cellulose, 10, 397-404 (2003).*
    2003年 [査読無し][通常論文]
  • Y. Usukura, Y. Uraki, T. Kishimoto and Y. Sano: Characterization of amphiphilic lignin derivative-Formation of Langmuir Blodgett film and Gel. Proceedings of 12th International Symposium on Wood and Pulping Chemistry, vol.1, 329-332 (2003).
    2003年 [査読無し][通常論文]
  • J. Nemoto, Y. Uraki and Y. Sano:Preparation of fiberboards from waste papers and isolated lignins. Proceedings of 12th International Symposium on Wood and Pulping Chemistry, vol.1, 219-222 (2003).
    2003年 [査読無し][通常論文]
  • リグニン-古紙複合物を原料とするボード状成形物の作製とその特性
    木材学会誌 49 287 -292 2003年 [査読無し][通常論文]
  • S. Kubo, Y. Uraki and Y. Sano: Catalytic graphitization of hardwood acetic acid lignin with nickel acetate. J. Wood. Sci., 49, 188-192 (2003).*
    2003年 [査読無し][通常論文]
  • M. Nishida, Y. Uraki and Y. Sano: Lignin gel with unique swelling property. Bioresource Tech., 88, 81 – 83 (2003).*
    2003年 [査読無し][通常論文]
  • M. Mustafaev, Z. Mustafaeva, E. Ergen, Y. Uraki, Y. Sano: Novel betulin-containing polyelectrolyte conjugates. Journal of Bioactive and Compatible Polymers, 17(4), 251-269 (2002).*
    2002年 [査読無し][通常論文]
  • Y. Miharu, Y. Uraki, K. Itoyama, F. Miyazawa, Hi. Tanibe and Y. Sano: Improvement of moisture sorption of polyurethane fiber by blending cellulose. Sen-i Gakkaishi, 58, 375-380 (2002).*
    2002年 [査読無し][通常論文]
  • Y. Uraki, S. Kubo and Y. Sano: Preparation of activated carbon moldings from the mixture of waste newspaper and isolated lignins-Mechanical strength of thin sheet and adsorption property-. J. Wood. Sci., 48, 521-526 (2002).*
    2002年 [査読無し][通常論文]
  • Y. Uraki, M. Morito, T. Kishimoto and Y. Sano: Bacterial cellulose production using monosaccharides derived from hemicelluloses in water-soluble fraction of waste liquor from atmospheric acetic acid pulping. Holzforschung, 56, 341-347 (2002).*
    2002年 [査読無し][通常論文]
  • S. Kubo, Y. Uraki and Y. Sano: "Catalytic graphitization of hardwood acetic acid lignin with nickel (II) acetate.", Proceedings of11th Internatiuonal Symposium on Wood and Pulping Chemistry, vol. 2, 115-118 (2001).
    2001年 [査読無し][通常論文]
  • Y. Uraki, A. Nakatani, S. Kubo and Y. Sano: "Preparation of activated carbon fibers with large specific surface area from softwood acetic acid lignin.", J. Wood Sci., 47: 465-469 (2001).*
    2001年 [査読無し][通常論文]
  • Y. Uraki, M. Morito, T. Kishimoto and Y. Sano: "Conversion of hemicellulose sugar to carbon resources for bacterial cellulose production.", Proceedings of 11th Internatiuonal Symposium on Wood and Pulping Chemistry, vol. 2, 111-114 (2001).
    2001年 [査読無し][通常論文]
  • Y. Uraki, N. Ishikawa, M. Nishida and Y. Sano: "Preparation of amphiphilic lignin derivative as a cellulase stabilizer.", J. Wood. Sci., 47: 301-307.*
    2001年 [査読無し][通常論文]
  • M. Nishida, Y. Uraki and Y. Sano: "Preparation of lignin based hydrogel and its interaction with amphiphilic compounds.", Proceedings of11th Internatiuonal Symposium on Wood and Pulping Chemistry, vol. 2, 43-46 (2001).
    2001年 [査読無し][通常論文]
  • Y. Uraki, R. Taniwatashi, S. Kubo and Y. Sano: "Activated carbon sheet prepared from softwood acetic acid lignin." J. Wood Sci., 46, 52-58 (2000).*
    2000年 [査読無し][通常論文]
  • Y. Uraki, A. Hanzaki, K. Hashida and Y. Sano: "Self-Assembly of Pulp Derivatives as Amphiphilic Compounds -Association and Complexation with Low and High Molecular Mass Compounds.", Holzforschung, 54, 535-540 (2000).*
    2000年 [査読無し][通常論文]
  • S. Shimamoto, Y. Uraki and Y. Sano: "Optical properties and photopolymerization of liquid crystalline (acetyl) (ethyl) cellulose/acrylic acid system"., Cellulose, 7, 347-358 (2000).*
    2000年 [査読無し][通常論文]
  • 紙パ技協誌 54 1252 -1259 2000年 [査読無し][通常論文]
  • Y. Uraki, Y. Miharu, R. Funada, Y. Sano, M. Mitsuhashi, K. Itoyama and H. Tanibe: "Preparation and Characterization of Alginate-blended Rayon"., Sen-i Gakkaishi, 56, 482-486(2000).*
    2000年 [査読無し][通常論文]
  • 『ウッドケミカルスの最新技術』<飯塚尭介, 監修>
    シーエムシー 2000年 [査読無し][通常論文]
  • Y. Uraki and Y. Sano: "Polyhydric alcohol pulping at atmospheric pressure: An effective method for organosolv pulping of softwoods.", Holzforschung, 53, 411-415 (1999).*
    1999年 [査読無し][通常論文]
  • Y. Urakj, N. Ishikawa, M. Nishida and Y. Sano: "Stabilization of cellulase with amphiphilic acetic acid lignin derivative", Proceedings of 10th Internatiuonal Symposium on Wood and Pulping Chemistry, vol. I, 470-473 (1999).
    1999年 [査読無し][通常論文]
  • S. Kubo, Y. Uraki Y. Sano and K.-l. Chen: ”Preparation of functional carbonaceous materials from isolated lignins”, Proceedings of10th Internatiuonal Symposium on Wood and Pulping Chemistry, vol. III, 388-393 (1999).
    1999年 [査読無し][通常論文]
  • S. Kubo, Y. Uraki and Y. Sano:"Preparation of Carbon Fibers from Softwood Lignin by Atmospheric Acetic Acid Pulping.", Carbon, 36, 1119-1124 (1998)*
    1998年 [査読無し][通常論文]
  • 潘 学軍, 佐野 嘉拓, 中嶋 博, 浦木 康光 紙パ技協誌 52 (3) 408 -415 1998年 [査読無し][通常論文]
  • Y.-G. Kim, N. Watanabe, Y. Sano, Y. Uraki and Y. Sano:"Extractives of Kitakobushi Magnolia Kobus DC. var. borealis Sarg. III. -Antibacterial and Antifungal Activity of Extractives.-", Research Bulletin of The Hokkaido University Forests, 55, 63-73 (・・・
    1998年 [査読無し][通常論文]
     
    Y.-G. Kim, N. Watanabe, Y. Sano, Y. Uraki and Y. Sano:"Extractives of Kitakobushi Magnolia Kobus DC. var. borealis Sarg. III. -Antibacterial and Antifungal Activity of Extractives.-", Research Bulletin of The Hokkaido University Forests, 55, 63-73 (1998)*
  • Uraki, Y., Hashisa, K. and Sano, Y. : "Self-Assembly of Pulp Derivatives as Amphiphilic Compounds-Preparation of Amphiphilic Compound from Acetic Acid Pulp and its Properties as an Inclusion Compound", Holzforschung, 51(1) : 91-97 (1997)*
    1997年 [査読無し][通常論文]
  • Kubo, S., Ishikawa, M., Uraki, Y. and Sano, Y. : "Preparation of lignin fibers from softwood acetic acid lignin-Relationship between fusibility and the chemical structure of lignin-", Mokuzai Gakkaishi, 43(8) : 655-662 (1997)*
    1997年 [査読無し][通常論文]
  • Uraki, Y., Chen, C. -L. and Gratzl, J. : "Sonolysis of Chloro-Organics in Bleach Plant E-1 Effluents", Holzforschung, 51 : 452-458 (1997)*
    1997年 [査読無し][通常論文]
  • Uraki, Y., Kubo, S. and Sano, Y. : "Characteristics of Activated Carbon Fibers Prepared from Acetic Acid Lignin", Proceedings ATC '97 The 4th Asian Textile Conference, 1 : 36-41 (1997)
    1997年 [査読無し][通常論文]
  • Uraki, Y., Kubo, S., Kurakami, T., and Sano, Y. : "Activated Carbon Fibers from Acetic Acid Lignin", Holzforschung, 51(2) : 188-192 (1997)*
    1997年 [査読無し][通常論文]
  • S. Kudo, Y. Uraki and Y. Sano : "Thermomechanical Analysis of Isolated Lignins", Holzforschung, 50 : 144-150 (1996)*
    1996年 [査読無し][通常論文]

受賞

  • 2009年 第7回北の木材科学賞
  • 2008年 第6回北の木材科学賞
  • 2007年 第5回北の木材科学賞
  • 2006年 第4回北の木材科学賞
  • 2006年 日本木材学会賞
  • 2006年 The Japan Wood Research Society Prize for 2006
  • 2005年 第3回北の木材科学賞
  • 2003年 第1回北の木材科学賞

共同研究・競争的資金等の研究課題

  • 人工細胞壁の創製
    科学研究費補助金
    研究期間 : 2002年
  • Creation of artificial cell wall
    Grant-in-Aid for Scientific Research
    研究期間 : 2002年
  • 木質バイオマスのバイオリファイナリーと分離成分の有効利用,
    科学研究費補助金
    研究期間 : 1989年
  • Biorefinery of woody biomass and effective utilization of refined components
    Grant-in-Aid for Scientific Research
    研究期間 : 1989年

教育活動情報

主要な担当授業

  • 森林資源科学演習
    開講年度 : 2018年
    課程区分 : 修士課程
    開講学部 : 農学院
    キーワード : 森林科学、論理構築、発表技法、論文読解法、ゼミナール
  • 環境資源特論
    開講年度 : 2018年
    課程区分 : 修士課程
    開講学部 : 国際食資源学院
    キーワード : 炭素循環,窒素循環,物質循環,エネルギー循環,栄養循環,生態学,土壌学,気象学,気候学,地形学,環境科学,水環境学
  • 環境解析とモニタリング特論演習
    開講年度 : 2018年
    課程区分 : 修士課程
    開講学部 : 国際食資源学院
    キーワード : 環境数理モデリング,水輸送現象,土壌物理分析,地理情報処理システム,環境情報学,機器分析,安定同位体地球化学,気象観測,リモートセンシング
  • 環境管理特論演習
    開講年度 : 2018年
    課程区分 : 修士課程
    開講学部 : 国際食資源学院
    キーワード : 水環境,土壌環境,大気環境,環境マネージメント学,気象学,気候学,バイオマス,物質とエネルギー循環(炭素),物質とエネルギー循環,栄養循環
  • 応用分子生物学演習
    開講年度 : 2018年
    課程区分 : 修士課程
    開講学部 : 農学院
    キーワード : バイオテクノロジー,生物利用・物質生産
  • 応用分子生物学総論
    開講年度 : 2018年
    課程区分 : 修士課程
    開講学部 : 農学院
    キーワード : バイオテクノロジー、糖質酵素、mRNA分解、昆虫ウイルス、植物ウイルスベクター、糖質生合成、酵素改変、木質資源、食品機能、微生物資源、微生物バイオプロセス
  • 大学院共通授業科目(一般科目):自然科学・応用科学
    開講年度 : 2018年
    課程区分 : 修士課程
    開講学部 : 大学院共通科目
    キーワード : バイオテクノロジー、糖質酵素、mRNA分解、昆虫ウイルス、植物ウイルスベクター、糖質生合成、酵素改変、木質資源、食品機能、微生物資源、微生物バイオプロセス
  • 森林資源科学総論
    開講年度 : 2018年
    課程区分 : 修士課程
    開講学部 : 農学院
    キーワード : 造林学、森林資源生物学、木材科学、森林保護学、森林立地学、森林遺伝育種学 Silviculture ndForest Ecology, Forest micro-biology, Vegetation science, Wood Science, Forest Protechtion, Forest Environment, Forest Genetics and Breeding
  • 高分子学概論
    開講年度 : 2018年
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 生体高分子、天然高分子、合成高分子、機能と構造、分子量
  • 木質バイオマス変換化学
    開講年度 : 2018年
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 木質バイオマス、バイオリファイナリー、細胞壁成分、機能性材料
  • 林産製造学実験
    開講年度 : 2018年
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 紙、パルプ、セルロース誘導体、リグニン誘導体
  • 環境化学
    開講年度 : 2018年
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 大気・河川・湖沼・海洋・地下水・土壌の汚染、人工公害物質、ミスト、バイオレメディエーション、バイオマス廃棄物の資源化・循環、LCA
  • 卒業論文
    開講年度 : 2018年
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 森林科学に関する研究、主体性、まとめる能力、伝える能力、質問への応答能力、
  • 林産学実習
    開講年度 : 2018年
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 木炭、活性炭、木酢液、きのこ、製材、樹幹解析、繊維傾斜、等級区分
  • 森林科学演習Ⅱ
    開講年度 : 2018年
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 森林科学、論理構築、発表技法、論文読解法、ゼミナール Forest Science, training of logic, presentation, seminar, and how to read scientific papers
  • 森林科学演習Ⅰ
    開講年度 : 2018年
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 森林科学、論理構築、発表技法、論文読解法、ゼミナール
  • 化学概論
    開講年度 : 2018年
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 教育職員免許法に関わる科目

大学運営

委員歴

  • 2010年 - 2012年   日本木材学会   理事   日本木材学会
  • 2010年   日本木材学会   北海道支部副支部長   日本木材学会
  • 2004年 - 2009年   日本木材学会   研究強化委員   日本木材学会
  • 2009年   高分子学会   理事および北海道支部長   高分子学会


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