Artificial Chitin Spherulites Composed of Single Crystalline Ribbons of α-Chitin via Enzymatic Polymerization
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- Junji Sakamoto
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan, Wood Research Institute, Kyoto University, Uji, Kyoto 611-0011, Japan, and Department of Applied Biological Chemistry, Faculty of Agriculture, Niigata University, Niigata 950-2181, Japan
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- Junji Sugiyama
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan, Wood Research Institute, Kyoto University, Uji, Kyoto 611-0011, Japan, and Department of Applied Biological Chemistry, Faculty of Agriculture, Niigata University, Niigata 950-2181, Japan
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- Shunsaku Kimura
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan, Wood Research Institute, Kyoto University, Uji, Kyoto 611-0011, Japan, and Department of Applied Biological Chemistry, Faculty of Agriculture, Niigata University, Niigata 950-2181, Japan
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- Tomoya Imai
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan, Wood Research Institute, Kyoto University, Uji, Kyoto 611-0011, Japan, and Department of Applied Biological Chemistry, Faculty of Agriculture, Niigata University, Niigata 950-2181, Japan
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- Takao Itoh
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan, Wood Research Institute, Kyoto University, Uji, Kyoto 611-0011, Japan, and Department of Applied Biological Chemistry, Faculty of Agriculture, Niigata University, Niigata 950-2181, Japan
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- Takeshi Watanabe
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan, Wood Research Institute, Kyoto University, Uji, Kyoto 611-0011, Japan, and Department of Applied Biological Chemistry, Faculty of Agriculture, Niigata University, Niigata 950-2181, Japan
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- Shiro Kobayashi
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan, Wood Research Institute, Kyoto University, Uji, Kyoto 611-0011, Japan, and Department of Applied Biological Chemistry, Faculty of Agriculture, Niigata University, Niigata 950-2181, Japan
書誌事項
- 公開日
- 2000-05-01
- DOI
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- 10.1021/ma000230y
- 公開者
- American Chemical Society (ACS)
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説明
A crystalline product of artificial chitin by chitinase-catalyzed polymerization of a chitobiose oxazoline derivative was investigated by using optical microscopy in combination with TEM and SEM techniques. Platelike single crystals of α-chitin were first formed. The crystals were gradually shaped into ribbons by the rapid growth along the a axis with the crystalline thickness being ca. 10 nm. The α-chitin ribbons then aggregated to form bundlelike or dendritic assemblies as the ribbon concentration in solution increased. They grew into spherulites by splaying and branching, which displayed birefringence with a Maltese cross by polarization microscopic observation. The present artificial chitin spherulite, in which a number of α-chitin ribbons radiated from a common center, is completely different from the helicoidal textures composed of α-chitin microfibrils which have been known so far as a typical three-dimensional organization of chitin.
収録刊行物
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- Macromolecules
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Macromolecules 33 (11), 4155-4160, 2000-05-01
American Chemical Society (ACS)