キチン・キトサンフィルムの生分解特性 Biodegradation Characteristics of Chitin and Chitosan Films

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Abstract

本研究は, 蟹, 海老およびロブスターから得られたキチン・キトサンを使用し, 再生利用可能な材料の開発に焦点を合わせて検討した.キチン・キトサンフィルムを調製し, 力学的性質と生分解性に関して調査した。キチンフィルムの引張強度は, キトサンフィルムよりも 30~40%程度低かったが, キチンフィルムの結晶化度はキトサンフィルムよりも高かった.キトサンフィルムの結晶化度や微結晶の配向は4種の溶媒間で大差がないけれども, 詳細に検討すると, 酢酸で作製したフィルムの結晶化度は他の試料より少々低かった.土壌から分離したキトサン分解菌<I>Sphingobacterium multivorum</I>によるキチンフィルムの分解速度は, キトサンフィルムよりも高かった.キトサンフィルムの分解速度は, 酢酸を溶媒にして作製したフィルムが最も高く, プロピオン酸, 蟻酸, 酪酸溶媒フィルムの順であった.キトサンフィルムは, フィブリルが表面から剥離していく様子が明確にSEM観察できた.

This research focused on the development of recyclable materials by using chitin and chitosan obtained from shells of crab, shrimp and lobster. The fabrication of chitin and chitosan films was investigated is terms of their mechanical properties and biodegradation. The tensile strength of chitin films was 30-40% lower than that of chitosan films, but the crystallinity of chitin film was much higher than that of chitosan films. The crystallinity and orientation of crystallites were hardly affected by the four kinds of solvent chosen to cast chitosan films, but a detailed analysis revealed that the cast film prepared with acetic acid provided slightly lower crystallinity than others. The degradation rate of chitin films by <I>Sphingobacterium multivorum</I>, a kind of decomposition bacteria separated from soil, was higher in comparison with the chitosan films. The degradation rate of chitosan samples prepared with acetic acid was the highest, followed in order by the films prepared with propionic acid, formic acid and butyric acid. SEM observation revealed that the degradation of chitosan films was followed by exfoliation of chitosan fibrils from the film surface.

Journal

  • Journal of Home Economics of Japan

    Journal of Home Economics of Japan 56(12), 889-897, 2005

    The Japan Society of Home Economics

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