title: Purification of conjugated linoleic acid isomers through a process including lipase-catalyzed selective esterification.
abstract: A mixture of conjugated linoleic acids (CLAs) was prepared by alkali conjugation of high purity linoleic acid. The preparation contained 45.1 wt% cis-9, trans-11 (c9,t11)-CLA, 46.8 wt% trans-10, cis-12 (t10,c12)-CLA, and 5.3 wt% other CLAs. A process comprising Candida rugosa lipase-catalyzed selective esterification with lauryl alcohol, molecular distillation, and urea adduct fractionation under strict conditions in ethanol was very effective for purification of c9,t11- and t10,c12-CLAs. In particular, the urea adduct fractionation efficiently eliminated CLAs except c9,t11- and t10,c12-isomers. Purification of c9,t11- and t10,c12-CLAs from 1.0 kg of the CLA mixture increased the c9,t11-CLA purity to 93.1% with 34% recovery of the initial content, and increased the t10,c12-CLA purity to 95.3% with 31% recovery.
authors.affiliation: Osaka Municipal Technical Research Institute, 1-6-50 Morinomiya, Joto-ku, Osaka 536-8553, Japan.
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Nagao
authors.forename: Yoshie
authors.initials: Y
authors.lastname: Yamauchi-Sato
authors.forename: Akio
authors.initials: A
authors.lastname: Sugihara
authors.forename: Toshio
authors.initials: T
authors.lastname: Iwata
authors.forename: Koji
authors.initials: K
authors.lastname: Nagao
authors.forename: Teruyoshi
authors.initials: T
authors.lastname: Yanagita
authors.forename: Shuji
authors.initials: S
authors.lastname: Adachi
authors.forename: Yuji
authors.initials: Y
authors.lastname: Shimada
mesh_terms: D002175:Candida / Q000201:enzymology; D002384:Catalysis; D005591:Chemical Fractionation; D004951:Esterification; D007202:Indicators and Reagents; D019787:Linoleic Acid / Q000302:isolation & purification* / Q000378:metabolism; D008049:Lipase / Q000378:metabolism*; D013237:Stereoisomerism
chemical_list: D007202:Indicators and Reagents; D019787:Linoleic Acid; D008049:Lipase