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dc.contributor.authorDong, YM
dc.contributor.author董炎明
dc.contributor.authorRuan, YH
dc.contributor.author阮永红
dc.contributor.authorWu, YS
dc.contributor.author吴玉松
dc.contributor.authorWang, MA
dc.contributor.author王勉
dc.contributor.authorQiu, WB
dc.contributor.author丘蔚碧
dc.contributor.authorXu, CY
dc.contributor.author许聪义
dc.date.accessioned2012-05-18T01:02:19Z
dc.date.available2012-05-18T01:02:19Z
dc.date.issued2002
dc.identifier.citationCHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,2002,23(3):490-495zh_CN
dc.identifier.issn0251-0790
dc.identifier.urihttps://dspace.xmu.edu.cn/handle/2288/12440
dc.description.abstractBeing different from the literature results, the chemical reactivity of beta-chitin was found to be poorer than that of alpha-chitin for O-propionylation reaction (basically a heterogeneous reaction). But the chemical reactivity of beta-chitin was almost the same as that of alpha-chitin for N-acetylation reaction(a homogeneous reaction). The poor reactivity of beta-chitin is explained by the higher crystallinity shown by the results of X-ray diffraction, the closer fibrillar structure shown by microscopy, and the higher stability of crystals shown by higher decomposition temperature in the thermogravimetric curves. After beta-chitin was fibrillated by wet grinding, the O-propionylation reactivity increases evidently, but was still lower than that of achitin. Four levels of fibril structure can be distinguished in fibrillated beta-chitin by polarized optical microscopy and scanning electron microscopy, i.e. fibrillar bundle, fibril, microfibril and elementary fibril with diameter in the order of 10(1), 10(0), 10(-1) and 10(-2) mum respectively. A model for four levels of fibril structure of beta-chitin is first suggested. Because more free hydroxyl groups are exposed on all levels of fibrils, the chemical reactivity of fibrillated P-chitin enhances.zh_CN
dc.language.isozhzh_CN
dc.publisherHIGHER EDUCATION PRESSzh_CN
dc.subjectchitinzh_CN
dc.subjectchitosanzh_CN
dc.subjectbeta-chitinzh_CN
dc.subjectchemical reactivityzh_CN
dc.titleChemical reactivity characteristics of beta-chitin from squid pen and its comparison with alpha-chitinzh_CN
dc.typeArticlezh_CN


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