Add time:09/09/2019 Source:sciencedirect.com
A method for purification of cis-9,trans-11 isomer of conjugated linoleic acid (CLA) is described. Lipase from Candida cylindracea (CCL) was highly selective towards cis-9,trans-11 isomer and was chosen to catalyze esterification of a mixture of two CLA isomers. The effect of various parameters on the esterification process of an almost equimolar mixture of cis-9,trans-11 (44.0%), trans-10,cis-12 (42.5%) and other CLA isomers (13.5%) was studied. The influence of alcohol substrate, CLA/alcohol molar ratio, lipase amount, reaction temperature, pH and time of the reaction on the total esterification and cis-9,trans-11 isomer purity in ester fraction were examined. The highest isomeric excess of cis-9,trans-11 isomer on trans-10,cis-12 CLA and good esterification degree was observed when the esterification condition were as follows: CLA/2-propanol molar ratio, 1:5; water, 200% wt of CLA; CCL, 24 μg of CCL/mg CLA; temperature 30 ̊C; time of reaction 6 h and when mixture enriched in cis-9,trans-11 CLA was used as a substrate for esterification. A preparative scale purification combining crystallization and one step enzymatic process were made to afford purified cis-9,trans-11 (94.2%) with total recovery of 31%.
We also recommend Trading Suppliers and Manufacturers of METHYL ESTER OF CLA (9-CIS, 11-TRANS) (cas 13058-52-1). Pls Click Website Link as below: cas 13058-52-1 suppliers
About|Contact|Cas|Product Name|Molecular|Country|Encyclopedia
Message|New Cas|MSDS|Service|Advertisement|CAS DataBase|Article Data|Manufacturers | Chemical Catalog
©2008 LookChem.com,License: ICP
NO.:Zhejiang16009103
complaints:service@lookchem.com Desktop View