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Position: Home > Articles > Enzymatic Acylation of Epigallocatechin Gallate (EGCG) and Antioxidant Activity of Acylated EGCG in Soybean Oil FOOD SCIENCE 2013,34 (8) 1-5

酶法酰化儿茶素EGCG及其产物在大豆油中的抗氧化性

作  者:
李哲;朱松;王洪新
单  位:
江南大学食品科学与技术国家重点实验室;江南大学食品学院
关键词:
酶法;乙酰化;表没食子儿茶素没食子酸酯(EGCG);抗氧化
摘  要:
利用脂肪酶在非水相反应体系中催化茶多酚中EGCG(表没食子儿茶素没食子酸酯)的乙酰化反应,以增加EGCG的脂溶性。研究了反应体系溶剂、加酶量、反应时间、反应温度、底物物质的量比等条件对EGCG乙酰化转化率的影响。利用单因素试验和正交试验确定了最佳的反应条件:反应体系溶剂为乙腈、温度45℃、时间10h、乙酸乙烯酯与EGCG物质的量比0.5:1、加酶量7%。并且初步研究了乙酰化产物在大豆油中的抗氧化性,实验表明在相同添加量的情况下,乙酰化EGCG的抗氧化性要高于未改性EGCG及BHT,低于TBHQ。
译  名:
Enzymatic Acylation of Epigallocatechin Gallate (EGCG) and Antioxidant Activity of Acylated EGCG in Soybean Oil
作  者:
LI Zhe1,ZHU Song2,WANG Hong-xin1,(1.School of Food Science and Technology,Jiangnan University,Wuxi 214122,China;2.State Key Laboratroy of Food Science and Technology,Wuxi 214122,China)
关键词:
enzymatic acetylation;epigallocatechin gallate(EGCG);antioxidant activity
摘  要:
The acetylation of EGCG as a green tea polyphenol was catalyzed by lipases in a non-aqueous phase reaction system so as to increase the lipophilicity of EGCG.This study investigated the effects of solvent type,enzyme dosage,reaction temperature and vinyl acetate/EGCG molar ratio on the conversion rate of EGCG.These reaction conditions were optimized by one-factor-at-a-time method and orthogonal array design.As a result,the optimum conditions for EGCG acetylation were found to be reaction at 45 ℃ for 10 h in acetonitrile with a vinyl acetate-to-EGCG molar ratio of 0.5:1 and an enzyme dosage of 7%.In soybean oil,the antioxidant activity of acylated EGCG was higher than that of EGCG and BHT but lower than that of TBHQ at equal concentration.

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