Sweet potato amylose and amylopectin with narrower distribution of molar mass and chain length obtained by a repeated retrogradation-hydrolysis procedure

文献类型: 外文期刊

第一作者: Dong, Shirui

作者: Dong, Shirui;Zhao, Pei;Gao, Kai;Kang, Haiqi;Li, Lin;Li, Lin

作者机构:

关键词: aging;biodegradable;microscopy;polycarbonates;self-assembly

期刊名称:JOURNAL OF APPLIED POLYMER SCIENCE ( 影响因子:3.125; 五年影响因子:2.754 )

ISSN: 0021-8995

年卷期: 2016 年 133 卷 34 期

页码:

收录情况: SCI

摘要: The wide molar mass distribution of native starch creates obstacles in investigating the physicochemical characteristics of starch, such as retrogradation, because samples thought to be the same are actually compounds containing many chains with different molar masses. In this paper, the sweet potato amylose and amylopectin isolated from retrograded starch were treated with the retrogradation-hydrolysis method three times, and their physicochemical changes in this process were determined by absorbance of the starch-iodine complex, light microscopy, and molar mass and chain length distributions. The results showed that repeated retrogradation and hydrolysis caused the molar mass distribution of sweet potato amylose and amylopectin to reduce from 4.2x10(7)-205 and 7971-223 to 6.0x10(4)-730 and 4533-211g mol(-1), respectively. This retrogradation-hydrolysis cut the chain length distribution of sweet potato amylose from DP 9-35 to DP 3-13, but that of amylopectin remained unchanged. The double helix in sweet potato amylopectin will not form if the percentage of chain length with DP4 is less than 25%. Repeated retrogradation and hydrolysis was an appropriate method to obtain amylose or amylopectin with a narrower molar mass distribution. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43849.

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