Effect of ethanol concentrations on rice bran protease activity and ester synthesis during enzymatic synthesis of oleic acid ethyl ester in a fed-batch system using crude rice bran (Oryza sativa) lipase

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	Effect of ethanol concentrations on rice bran protease activity and ester synthesis during enzymatic synthesis of oleic acid ethyl ester in a fed-batch system using crude rice bran (Oryza sativa) lipase
	Hidayat, C.
	2014
Source Publication	Biocatalysis and Biotransformation
ISSN	1024-2422
Volume	32 Issue:4 Pages:231-235
Abstract	Crude rice bran lipase was used for the enzymatic synthesis of Oleic Acid Ethyl Ester (OAEE) in a fed-batch system. It was found that rice bran contains protease (4.19 U/g) and lipase (324.03 U/g). The results show that protease inhibits lipase at a low concentration of ethanol (5 mu mol/ml), in which lipase esterification activity was only 45.02 U/g. However, protease activity decreased about 11 times at a higher concentration of ethanol (5-50 mu mol/ml). It resulted in an increase in the esterification activity of lipase (324.03 U/g). This finding could be used for explaining the effects of ethanol on the enzymatic synthesis of OAEE using crude rice bran lipase in a fed-batch system. When the ethanol concentration in the reaction system was low (<= 4 mu mol/ml), the final OAEE conversion was only 30%. It was caused both by the inhibition of lipase by rice bran protease and by the effect of low ethanol concentration on the equilibrium position of the lipase-catalysed esterification reaction. However, the final OAEE conversion reached 76-92% when higher ethanol concentrations (12.5-50 mu mol/ml) were added at initial reaction. It is suggested that the addition of higher ethanol concentrations (12.5-50 mu mol/ml) into the reaction system may reduce protease activity and also increase ethanol concentration in the reaction system to be converted into OAEE.
Document Type	期刊论文
Identifier	https://ir.xtbg.ac.cn/handle/353005/7684
Collection	热带植物资源可持续利用重点实验室特色文献_小桐子相关文献
Recommended Citation GB/T 7714	Hidayat, C.. Effect of ethanol concentrations on rice bran protease activity and ester synthesis during enzymatic synthesis of oleic acid ethyl ester in a fed-batch system using crude rice bran (Oryza sativa) lipase[J]. Biocatalysis and Biotransformation,2014,32(4):231-235.
APA	Hidayat, C..(2014).Effect of ethanol concentrations on rice bran protease activity and ester synthesis during enzymatic synthesis of oleic acid ethyl ester in a fed-batch system using crude rice bran (Oryza sativa) lipase.Biocatalysis and Biotransformation,32(4),231-235.
MLA	Hidayat, C.."Effect of ethanol concentrations on rice bran protease activity and ester synthesis during enzymatic synthesis of oleic acid ethyl ester in a fed-batch system using crude rice bran (Oryza sativa) lipase".Biocatalysis and Biotransformation 32.4(2014):231-235.

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