Ultrasound irradiation promoted enzymatic alcoholysis for synthesis of monoglyceryl phenolic acids in a solvent-free system

文献类型： 外文期刊

第一作者： Xu, Chunfang

作者： Xu, Chunfang;Zhang, Haiping;Shi, Jie;Zheng, Mingming;Xiang, Xia;Huang, Fenghong;Zheng, Mingming;Xiang, Xia;Xiao, Junyong;Zheng, Mingming;Xiang, Xia;Xiao, Junyong

作者机构：

关键词： Ultrasound irradiation;Enzymatic alcoholysis;Monoglyceryl phenolic acids;Solvent-free;Antioxidation

期刊名称：ULTRASONICS SONOCHEMISTRY （ 影响因子：7.491； 五年影响因子：7.537 ）

ISSN： 1350-4177

年卷期： 2018 年 41 卷

页码：

收录情况： SCI

摘要： Monoglyceryl phenolic acids (MPAs) were known as the natural hydrophilic antioxidants which could be used in different fields such as food, pharmaceutical, cosmetic etc. A novel enzymatic route of MPAs synthesis by the alcoholysis of phenolic acid ethyl esters with glycerol under ultrasound irradiation in solvent free system was developed. Optimization of reaction parameters shows that a high conversion of above 97.4% can be obtained under the following conditions: phenolic acid ethyl esters to glycerol molar ratio of 1:10, with 6% catalyst (Novozym 435), at 60 degrees C and 200 rpm, with ultrasound input of 250 W, at 20 kHz frequency. Compared to the conventional stirring method, the activation energy for phenolic acid ethyl esters conversion was decreased from 65.0 kJ/mol to 32.1 kJ/mol under ultrasound promotion; the apparent kinetic constant (V-m/K-m) increased above 1.2-folds; the lipase amount decreased to 50%; the time required for the maximum conversion reduced up to 3-folds without damaging the lipase activity, which is the fastest report for enzymatic synthesis of MPAs.

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