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| Synthesis of diacylglycerol through glycerolysis of palm oil catalyzed by phospholipase Lecitase® Ultra in a solvent-free system |
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| KeyWord:diacylglycerol palm oil phospholipase Lecitase® Ultra glycerolysis molecular distillation |
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| Abstract: |
| The diacylglycerol （DAG） was prepared through glycerolysis of palm oil catalyzed by phospholipase Lecitase? Ultra in a solvent-free system. The enzyme catalyzed glycerolysis conditions of DAG were studied by single factor experiment and it was purified by molecular distillation，then its fatty acid composition was analyzed by GC-MS. The results showed that the optimal glycerolysis conditions were obtained as follows：molar ratio of glycerol to palm oil 7.5∶1，reaction temperature 40℃，initial water content 4%（based on the total mass of substrates），enzyme dosage 2% （based on the total mass of substrates），and reaction time 8 h. Under the optimal conditions，the content of DAG in the product was 59.2%. While the content of DAG could achieve 88.1% through two-step molecular distillation，in which the content of 1，3-DAG was 1.6 times as high as 1，2-DAG. Compared with palm oil，the saturated fatty acids of DAG were enriched largly. |
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