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Citation: SUN Shi-Yu, FANG Yun, MIN Rui, XIA Yong-Mei. Effect of Microwave Irradiation on 1,3-Specificity of Novozyme 435 in Glyceride Synthesis[J]. Chinese Journal of Applied Chemistry, ;2007, 24(7): 778-781. shu

Effect of Microwave Irradiation on 1,3-Specificity of Novozyme 435 in Glyceride Synthesis

1.
School of Chemical and Material Engineering, Southern Yangtze University, Wuxi 214122

Corresponding author: FANG Yun,
Received Date: 12 August 2006
Available Online: 12 October 2006
Fund Project: 国家自然科学基金资助项目(20476038) (20476038)江苏省自然科学基金资助项目(BK2006021) (BK2006021)教育部新世纪优秀人才支持计划资助项目(2006) (2006)江苏省自然科学基金资助项目(BK2006021) (BK2006021)

Enzymatic esterification of glycerol and n-caprylic acid was studied under the catalysis of Novozyme 435 by means of microwave irradiation and conventional heating.Microwave irradiation increased initial reaction rate more than conventional heating did,and the initial reaction rate increased with increasing reaction temperature for both heating modes at 50~75℃.The contents of 2-monoglyceride and 1,2-diglyceride in the microwaved reaction mixture were higher than those in thermo heated reaction mixture,but the irradiation didn't change the lipase's 1,3-specificity.In general the microwave irradiation weakens the 1,3-specificity of enzymatic glycerol esterification of Novozyme 435 and the weakening effect is related to the reaction conditions.By conventional heating,the molar ratios of 1-monoglyceride to 2-monoglyceride (1-MG/2-MG) in the product were 26.9~43.4,and the ratio of 1,3-diglyceride to 1,2-diglyceride (1,3-DG/1,2-DG) were 10.5~19.6;whereas by microwave irradiation,the 1-MG/2-MG were decreased to 16.2~40.4 and the 1,3-DG/1,2-DG became 7.6~15.3.
- microwave,
- specificity,
- caprylic acid,
- glycerol,
- glyceride,
- lipase,
- regionspecificity,
- esterification
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