数字农科院2.0

Ultrasound irradiation accelerates the lipase-catalyzed synthesis of methyl caffeate in an ionic liquid

文献类型： 外文期刊

作者： Wang, Jun;Wang, Shasha;Li, Zhongjian;Gu, Shuangshuang;Wu, Fuan;Wang, Jun;Wang, Shasha;Li, Zhongjian;Gu, Shuangshuang;Wu, Fuan;Wang, Jun;Wu, Xiangyang

作者机构：

关键词： Biocatalysis;Ionic liquid;Lipase;Methyl caffeate;Ultrasound irradiation

期刊名称： JOURNAL OF MOLECULAR CATALYSIS B-ENZYMATIC

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Methyl caffeate is a natural ingredient with several biological activities, but its preparation is generally limited to chemical synthesis. To set up a simple, high-yield and low-cost synthesis process for obtaining methyl caffeate, a novel synthesis method using the lipase-catalyzed esterification of methanol and caffeic acid in an ionic liquid under ultrasound irradiation was established. A maximum yield of 99.79% was obtained using ultrasound irradiation with an ultrasound frequency of 25 kHz and ultrasound power of 150W under the following optimal conditions: Novozym 435 as a biocatalyst, [Bmim][Tf2N] as the reaction medium, lipase concentration of 60 g/L, reaction temperature of 75 degrees C, and reaction time of 9 h. Using the optimal conditions under ultrasound irradiation, the reaction time was reduced 0.75-fold, and the apparent kinetic parameter (V-m/K-m) was increased 2-fold. The lipase could be reused 11 times without significant loss of activity. The results suggest that ultrasound irradiation can accelerate lipase-catalyzed synthesis of methyl caffeate in an ionic liquid. (C) 2014 Elsevier B.V. All rights reserved.

分类号： O64`Q55`O643

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