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Enzyme-Catalyzed Starch Esterification in Deep Eutectic Solvent

文献类型： 外文期刊

作者： Deng, Xiaonan 2 ; Han, Xiaozhao 1 ; Hu, Xianguo 2 ; Zheng, Shufeng 3 ; Liu, Kun 1 ;

作者机构： 1.Hefei Univ Technol, Coll Chem & Chem Engn, 193 TunXi Rd, Hefei 230009, Anhui, Peoples R China

2.Hefei Univ Technol, Coll Mech Engn, 193 TunXi Rd, Hefei 230009, Anhui, Peoples R China

3.Anhui Acad Agr Sci, Cotton Res Inst, 40 Nongke Rd, Hefei 230001, Anhui, Peoples R China

关键词： Starch; Esterification; Deep eutectic solvent; Enzyme; Phase transfer agent

期刊名称：CHEMISTRYSELECT （ 影响因子：2.109； 五年影响因子：2.054 ）

ISSN： 2365-6549

年卷期： 2019 年 4 卷 2 期

页码：

收录情况： SCI

摘要： For the first time the enzymatic esterification of starch in deep eutectic solvent (DES) was reported using DES of choline chloride (ChCl)-ethylene glycol (EG) as reaction solvent/medium, Novozyme 435 as catalyst, and PEG 400 as phase transfer agent to synthesize starch decanoate, starch laurate, and starch palmitate. The product samples of esterified starches were characterized by FTIR, H-1 NMR, GPC, SEM, XRD, and DSC tests. The results showed that, the degrees of substitution were in the range of 0.07-0.19 and the addition of PEG 400 was helpful to increase the DS. The optimal esterification temperature for DS was 338 K in the range studied. The degradation of starch was found to be minor due to the use of long-chain fatty acid and relatively low reaction temperatures. The dissolution, gelatinization, esterification, and recrystallization of starch in DES broke the particles into smaller ones and altered the crystal structure of native starch while the aggregation between particles was increased and the degree of crystallinity was decreased for the esterified starch with the length of carbon-chain in the fatty acids.

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