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| Acyl migration during preparation of diacylglyceride by enzymatic esterification |
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| DOI： |
| KeyWord:diacylglyceride preparation enzymatic esterification acyl migration |
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| Abstract: |
| The diacylglyceride(DAG) was produced by esterification of glycerol with oleic acid catalyzed with a Sn-1,3-specific lipase of Lipozyme RM IM. The effects of esterification time, esterification temperature, molar ratio of oleic acid to glycerol and enzyme dosage on acyl migration in system were studied. The results showed that the molar ratio of oleic acid to glycerol had little effect on the acyl migration in the reaction system. Esterification time and esterification temperature were the main factors to determine the degree of acyl migration. The degree of acyl migration increased with the increasing of esterification time and esterification temperature. The acyl migration rates were 26.1% and 15.1% for the 10 h reaction at 65?℃ and for the 2 h reaction at 75?℃, respectively. The enzyme dosage had little effect on the acyl migration before the Lipozyme RM IM reached the equilibrium at the oil-water interface(enzyme dosage 6%). The acyl migration was obviously aggravated with the increasing of enzyme dosage after the Lipozyme RM IM reached the equilibrium at the oil-water interface. |
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