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J Agric Food Chem. 2005 Feb 23;53(4):923-7.

Effects of rhodium heterogeneous catalyst and isomerization conditions on linoleic acid conjugation of soybean oil.

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  • 1School of Food Technology, Institute of Agricultural Technology, Suranaree University of Technology, Nakhon Ratchasima, Thailand 3000.

Abstract

Rhodium heterogeneous catalyst was used to catalyze isomerization of linoleic acid in soybean oil to conjugated linoleic acid (CLA). A central composite rotatable design with five levels of three variables, namely, reaction temperature, stirring speed, and reaction time, was used to determine the maximum CLA yield. The formation of CLA during isomerization was greatly dependent on the reaction temperature and time. The CLA content of soybean oil increased from 0.63 to 202.42 mg/g oil when isomerization was done at 200 degrees C, with a stirring speed of 200 rpm for 49 min. Analysis of triacylglycerol positions showed that linoleic acid at any position in a triacylglyceride could possibly be isomerized to CLA.

PMID:
15712999
DOI:
10.1021/jf048957z
[PubMed - indexed for MEDLINE]
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