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1. Direct preparation of gels from herbal medicinal plants by using a low toxicity liquid zwitterion
Kodo, Chiaki ; Kuroda, Kosuke ; Miyazaki, Keisuke ; Tsuge, Yota ; Ninomiya, Kazuaki ; Takahashi, Kenji ; 黒田, 浩介 ; 柘植, 陽太 ; 仁宮, 一章 ; 髙橋, 憲司
概要:
金沢大学理工研究域生命理工学系<br />Gels containing medicinal ingredients of licorice were formed by dissolving into a biocompatible zw
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itterionic cellulose solvent and successive precipitation. The licorice gels gradually released glycyrrhizic acid, the main medicinal ingredient of licorice, within 3 h. Although the licorice gels were mechanically weak, gel strength was improved just by adding cellulose during the preparation of the gels.<br />Embargo Period 6 months<br />This paper has supplementary information.
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Nishita, Ryunosuke ; Kuroda, Kosuke ; Suzuki, Shiori ; Ninomiya, Kazuaki ; Takahashi, Kenji ; 黒田, 浩介 ; 仁宮, 一章 ; 髙橋, 憲司
概要:
金沢大学理工研究域生命理工学系<br />Grass and wood biomass (bagasse, cedar, and eucalyptus) was directly converted into flame-retardant
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thermoplastics by dissolution in an ionic liquid mixture and successive precipitation. During dissolution, the hydroxy groups of the biomass were substituted with a phosphonate-type ionic liquid. The three resulting biomass samples were formed into thin films by hot pressing at 140–160 °C. They also self-extinguished a fire by forming foamed char layers after contacting the fire in an alcohol lamp. In this method, more than 86% of the hydroxy groups were maintained after ionic liquid substitution because the single phosphonate-type ionic liquid acted as a plasticizer and flame retardant in the plant biomass. Therefore, plant biomass-derived flame-retardant thermoplastics have the potential for further functionalization.<br />Embargo Period 6 months<br />This paper has supplementary information.
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Nishita, Ryunosuke ; Kuroda, Kosuke ; Ota, Shohei ; Endo, Takatsugu ; Suzuki, Shiori ; Ninomiya, Kazuaki ; Takahashi, Kenji ; 黒田, 浩介 ; 仁宮, 一章 ; 髙橋, 憲司
概要:
金沢大学理工研究域生命理工学系<br />Three components of plant cell walls—cellulose, hemicellulose and lignin—were converted into flame-
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retardant thermoplastics by adducting only a single ionic liquid species via covalent bonds. They showed thermoplasticity and formed thin films by hot pressing. They also showed flame retardancy and self-extinguished the fire during burning. The properties of the samples depend on the cation species of ionic liquids adducted and thus are controllable. In the present study, more than 66% of the hydroxyl groups present on the polymers were maintained after derivatisation; they thus have the potential for further functionalisation for moulding, practical use and so on, in addition to flame retardancy and thermoplasticity.<br />Embargo Period 12 months<br />This paper has supplementary information.
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Kuroda, Kosuke ; Kodo, Chiaki ; Ninomiya, Kazuaki ; Takahashi, Kenji ; 黒田, 浩介 ; 仁宮, 一章 ; 髙橋, 憲司
概要:
金沢大学理工研究域生命理工学系<br />A polar carboxylate-type zwitterion with a small volume of water can dissolve cytochrome c without
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significant disruption, compared with the case of a popular polar carboxylate-type ionic liquid, 1-ethyl-3-methylimidazolium acetate. A change in the Soret, Q, and 615 nm bands was not observed in the 80 wt-% polar zwitterion solution, whereas a shift in the Soret band, diminishing Q band, and appearance of the 615 nm band was found in the 80 wt-% polar ionic liquid solution. It suggests that concentrated polar ionic liquid solutions critically disrupt the structure of cytochrome c, and the polar zwitterion solution used in this study was better than a 1-ethyl-3-methylimidazolium acetate solution in a high concentration range.<br />This paper has supplementary information.
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Satria, Heri ; Kuroda, Kosuke ; Tsuge, Yota ; Ninomiya, Kazuaki ; Takahashi, Kenji ; 黒田, 浩介 ; 柘植, 陽太 ; 仁宮, 一章 ; 髙橋, 憲司
概要:
金沢大学理工研究域生命理工学系<br />The cellulose dissolution ability of a liquid zwitterion, the most biocompatible cellulose solvent,
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was improved by adding a co-solvent, dimethylsulfoxide. Moreover, the biocompatibility of the liquid zwitterion was also improved by adding dimethylsulfoxide although it is toxic relative to the liquid zwitterion. This mixture is an efficient and extremely biocompatible cellulose solvent.<br />Embargo Period 12 months<br />This paper has supplementary information.
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Sakai, Hiroki ; Kuroda, Kosuke ; Tsukegi, Takayuki ; Ogoshi, Tomoki ; Ninomiya, Kazuaki ; Takahashi, Kenji ; 黒田, 浩介 ; 生越, 友樹 ; 仁宮, 一章 ; 髙橋, 憲司
概要:
金沢大学理工研究域生命理工学系<br />Lignin is a renewable resource, but it is also considered a waste or a very-low-value material. Her
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ein, we propose a lignin-derived compatibilizing agent as an alternative to the current compatibilizing agents. We prepared a polypropylene-based carbon fiber-reinforced plastic (CFRP) with butylated lignin (C4 lignin). Upon the addition of C4 lignin, the dispersion of carbon fiber into the matrix, and the adhesion between the carbon fiber and the matrix were greatly improved. As a result, the tensile strength of the CFRP prepared with C4 lignin was greater than that of the CFRP without lignan lignin (37.1 compared to 40.2 MPa). This value is close to that of CFRPs prepared with maleic anhydride-modified polypropylene (40.9 MPa), an existing compatibilizing agent. C4 lignin is a promising candidate for biomass-derived compatibilizing agents for polypropylene-based CFRPs.<br />Embargo Period 6 months<br />This paper has supplementary information.
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Sakai, Hiroki ; Kuroda, Kosuke ; Muroyama, Shiori ; Tsukegi, Takayuki ; Kakuchi, Ryohei ; Takada, Kenji ; Hata, Ayano ; Kojima, Ryosuke ; Ogoshi, Tomoki ; Omichi, Masaaki ; Ninomiya, Kazuaki ; Takahashi, Kenji ; 黒田, 浩介 ; 生越, 友樹 ; 仁宮, 一章 ; 髙橋, 憲司
概要:
金沢大学理工研究域生命理工学系<br />As an alternative to petroleum-based compatibilizing agents, we developed lignin derivatives for co
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mpatibilizing agents of carbon fiber-reinforced plastics that have thermoplasticity. In this study, alkyl chains were introduced into alkali lignin at various ratios to optimize the compatibility of the lignin derivatives with both polypropylene and carbon fiber. The interfacial shear strength between the two materials was improved from 8.2 to 17.2 MPa by mixing with the optimized lignin derivative. The value is comparable to that achieved with a typical petroleum-based compatibilizing agent (18.3 MPa).<br />Embargo Period 6 months<br />This paper has supplementary information.
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Kuroda, Kosuke ; Satria, Heri ; Miyamura, Kyohei ; Tsuge, Yota ; Ninomiya, Kazuaki ; Takahashi, Kenji ; 黒田, 浩介 ; 柘植, 陽太 ; 仁宮, 一章 ; 髙橋, 憲司
概要:
金沢大学理工研究域生命理工学系<br />We report an extremely biocompatible solvent for plant cell walls based on a polar liquid zwitterio
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n that dissolves cellulose, the most recalcitrant component of the plant cell walls. The polar liquid zwitterion does not affect the viability and activity of Escherichia coli, even at high concentrations. We demonstrate conversion of cell walls to ethanol via a starch-like process, namely successive dissolution, hydrolysis and fermentation in the same reaction pot.<br />Embargo Period 12 months<br />The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/jacs.7b08914.<br />This paper has supplementary information.
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Kuroda, Kosuke ; Inoue, Ken ; Miyamura, Kyohei ; Takada, Kenji ; Ninomiya, Kazuaki ; Takahashi , Kenji
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Lignocellulosic biomass was hydrolyzed by combining an acidic ionic liquid, 1-(1-butylsulfonic)-3-methylimidazolium hydr
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ogen sulfate, and microwave heating, resulting in high glucose yields and short reaction times. This new approach achieved 40% glucose yield from bagasse within 12 min at 160°C; whereas, almost no glucose was yielded with a well-known method involving H2SO4 and conventional heating within 30 min at the same temperature. It was confirmed that the reaction temperature significantly affected glucose yield and reaction rate; whereas, the concentration of the acidic ionic liquid only affected the reaction rate. Three kinds of lignocellulosic biomass, including bagasse (herbaceous biomass), eucalyptus (hardwood), and Japanese cedar (softwood), were examined. Glucose yield was in the range of 30–40%, indicating that the present method effectively hydrolyzes various kinds of lignocellulosic biomasses.
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Satria, Heri ; Kuroda, Kosuke ; Endo, Takatsugu ; Takada, Kenji ; Ninomiya, Kazuaki ; Takahashi, Kenji
概要:
A highly efficient hydrolytic method using an acidic ionic liquid is proposed: pretreatment of biomass with H2SO4; simpl
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e in situ synthesis of an acidic ionic liquid, 1-(1-butylsulfonic)-3-methylimidazolium hydrosulfate ([(HSO3)4C4C1im]HSO4), through addition of a zwitterion to the pretreated solution; and subsequent hydrolysis in the [(HSO3)4C4C1im]HSO4 solution at 100 °C under microwave heating. The high yields of glucose and xylose (around 80 and 100%, respectively) were attributed to the pretreatment by H2SO4 and the efficient catalytic activity of the [(HSO3)4C4C1im]HSO4. The high yields were comparable to the highest yields of acid hydrolysis at around 100 °C among previous literature, and the present method achieved more rapid hydrolysis. Decomposition of glucose and xylose was negligible because the reaction temperature was relatively mild. We also identified an electrodialysis method to separate [(HSO3)4C4C1im]HSO4 into H2SO4 and the zwitterion for reuse. Almost all of the H2SO4 (97%) was transferred to the concentrate compartment, and 99% of the zwitterion remained in the dilute compartment during electrodialysis.<br />Embargo Perid 12 months / Published online 24 October 2016
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