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| Lipozyme RM IM催化大豆卵磷脂与棕榈硬脂酯交换 |
| Transesterification of soybean lecithin and palm stearin catalyzed by Lipozyme RM IM |
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| DOI： |
| 中文关键词: 大豆卵磷脂 棕榈硬脂 酯交换 酯交换量 卵磷脂回收率 |
| 英文关键词:soybean lecithin palm stearin transesterification acyl incorporation recovery rate of lecithin |
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| 中文摘要: |
| 为了得到富含棕榈酸的卵磷脂，研究了正己烷溶剂体系下Lipozyme RM IM催化大豆卵磷脂与棕榈硬脂的酯交换反应。通过单因素实验，探讨了大豆卵磷脂质量浓度、底物摩尔比、加水量、加酶量和温度等对酯交换过程中酯交换量和卵磷脂回收率的影响，并采用响应面法对该酯交换反应的条件进行了优化。得到的最佳工艺条件为大豆卵磷脂质量浓度0.3 g/mL（大豆卵磷脂在加入的正己烷中的质量浓度），加酶量25%（以底物总质量计），加水量4%（以大豆卵磷脂质量计），底物摩尔比1∶2（大豆卵磷脂中脂肪酰基与棕榈硬脂中脂肪酰基摩尔比），温度46.7℃，时间27.4 h；在最佳工艺条件下，酯交换量可达19.8%，卵磷脂回收率为50.6%。 |
| 英文摘要: |
| The transesterification of palm stearin and soybean lecithin catalyzed by Lipozyme RM IM in n-hexane was studied so as to obtain lecithin rich in palmitic acid. The effects of mass concentration of soybean lecithin，molar ratio of substrates，water dosage，lipase dosage and temperature on the acyl incorporation and recovery rate of lecithin during transesterification were investigated by single factor experiment，and the transesterification reaction conditions were optimized by response surface methodology. The results showed that the optimal reaction conditions were obtained as follows：mass concentration of soybean lecithin 0.3 g/mL（in n-hexane），lipase dosage 25% （based on the total mass of substrates），water dosage 4% （based on the mass of soybean lecithin），molar ratio of fatty acyl group in soybean lecithin to fatty acyl group in palm stearin 1∶2，temperature 46.7℃，time 27.4 h. Under these conditions，the acyl incorporation and recovery rate of lecithin were 19.8% and 50.6%，respectively. |
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