Comparison of the Physicochemical Properties of Carboxymethyl Agar Synthesized by Microwave-Assisted and Conventional Methods

文献类型： 外文期刊

第一作者： Qi, Bo

作者： Qi, Bo;Yang, Shaoling;Zhao, Yongqiang;Wang, Yueqi;Yang, Xianqing;Chen, Shengjun;Wu, Yanyan;Pan, Chuang;Hu, Xiao;Li, Chunsheng;Wang, Lunan;Qi, Bo;Yang, Shaoling;Wang, Lunan

作者机构：

关键词： carboxymethyl agar; physicochemical characterization; microwave-assisted synthesis

期刊名称：GELS （ 影响因子：4.432； 五年影响因子：5.523 ）

ISSN：

年卷期： 2022 年 8 卷 3 期

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收录情况： SCI

摘要： The microwave-assisted carboxymethylation of agar to improve its physicochemical properties was investigated. Microwave power, reaction time, and temperature, ethanol concentration, and amounts of chloroacetic acid and sodium hydroxide were assessed for their effects on synthetic yield and degree of substitution (DS). All factors were positively correlated with DS within a certain range. Using optimized conditions, samples with different DS were prepared, and the physicochemical properties of unmodified and carboxymethyl agars prepared by microwave and conventional methods were compared. Carboxymethylation significantly changed the physicochemical properties of the agar, improving gel transparency and reducing dissolution temperature, gel strength, gel hardness, molecular weight, and molecular size; DS was the key factor. Specifically, higher DS values resulted in greater changes. The microwave-assisted method significantly shortened the reaction time and preserved molecular weight, gel strength, and texture hardness of the agar. Therefore, as an environmentally friendly method, microwave-assisted synthesis shows great promise for producing carboxymethyl agar.

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