Preparation and characterization of non-crystalline granular starch and corresponding carboxymethyl starch

文献类型： 外文期刊

第一作者： Li, Xiaomin

作者： Li, Xiaomin;Tao, Han;Wang, Wu;Chen, Han-Qing;Tao, Han;Xie, Qiutao

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关键词： Non-crystalline granular starch;Ethanol-heating treatment;Carboxymethyl starch

期刊名称：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES （ 影响因子：6.953； 五年影响因子：6.737 ）

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收录情况： SCI

摘要： Native corn starch slurried in 50% ethanol solution was treated at 60 degrees C, 70 degrees C, 80 degrees C, and 85 degrees C, respectively. The resultant starches were investigated by polarized microscopy, scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and X-ray diffractometry (XRD). The Maltese cross of ethanol-heating treated starch gradually weaken with increasing temperature and completely disappeared at 85 degrees C. SEM data indicated the treated granular exhibited a rougher surface with more pores and grooves than native starch granular, but the shape of the treated starch was still intact. DSC and XRD data confirmed ethanol-heating treated starch changed from crystalline to non-crystalline structure at 85 degrees C. The highest degree of substitution (DS) and corresponding reaction efficiency (RE) for the carboxymethylation of native starch were 0.66 and 36.7%, respectively, while the corresponding DS and RE for non-crystalline granular starches increased by 0.29 and 16.1% at the same reaction condition, respectively. (C) 2017 Elsevier B.V. All rights reserved.

分类号： Q71

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