Preparation of Chitosan with High Degree of Deacetylation from Amorphous Chitin

XU Lei; ZHANG Wenchang; ZHAO Yan; ZHANG Jinsong

doi:10.13386/j.issn1002-0306.2020100188

Volume 42 Issue 13

Jun. 2021

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Science and Technology of Food Industry > 2021 > 42(13): 216-220. > DOI: 10.13386/j.issn1002-0306.2020100188

XU Lei, ZHANG Wenchang, ZHAO Yan, et al. Preparation of Chitosan with High Degree of Deacetylation from Amorphous Chitin[J]. Science and Technology of Food Industry, 2021, 42(13): 216−220. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2020100188.

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Preparation of Chitosan with High Degree of Deacetylation from Amorphous Chitin

Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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Received Date: October 22, 2020
Available Online: April 24, 2021

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Abstract

By controlling the grinding time, four kinds of chitin powders with crystallinity of 80.91%, 58.06%, 31.94% and 8.09% were obtained by superfine grinding of chitin, then the heterogeneous deacetylation reaction of them and ordinary grinding chitin was comparative studied. The results showed that the degree of deacetylation of the prepared chitosan was increased with the decrease of crystallinity of chitin. Chitosan with high degree of deacetylation (>90%) could be obtained by single alkali treatment by using chitin powder with crystallinity of 31.94% and 8.09%, and the degree of deacetylation chitosan with ordinary grinding chitin was only 84%. According to the kinetic analysis, the activation energies of heterogeneous deacetylation of chitin powder obtained by ordinary grinding and four kinds of chitin powders obtained by superfine grinding were 58.71, 47.23, 42.30, 35.44 and 31.73 kJ/mol, respectively. The activation energy of the reaction decreased with the decrease of crystallinity, which indicated that amorphous treatment could enhance the heterogeneous deacetylation activity of chitin.
- chitin,
- superfine grinding,
- amorphization,
- degree of deacetylation,
- chitosan

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