摘要
研究了长链醇和甲酯使用耐热的固定化脂肪酶生产蜡酯的技术。酯交换反应是将两种反应物以不同的化学计量混合，在低浓度酶制剂存在下，于５５℃～６５℃温度范围内连续搅拌完成。最适宜的操作温度为６０℃，油酸甲酯（ＯＡＭＥ）与硬脂醇（ＳＡ）的摩尔比为１∶０５。一般能够得到高酯化率。基质抑制作用由硬脂醇引起。
Wax ester production from a long-chain alcohol and methyl ester has been investigated with an immobilized thermostable lipase.The transesterification reaction rate was monitored in solvent-free medium that was exclusively composed of the reactants and the enzyme.The transesterification is performed by simply mixing the two substrates in various stoichiometric amounts at a temperature range from 5565 under constant stirring in the presence of low concentrations of enzyme preparation (0.12% to 2%).Long-chain reactants produce waxes of high molecular mass that induce low solubility and high viscosity.On average,high transesterification yields are obtained (around 95%).Thermodynamic parameters involving substrate concentration and temperature have also been investigated.The balance between optimal working temperature and the molar ratio of substrates in such a complex medium appears to be 60,with a molar ratio methyl oleate/stearyl alcohol of 105,Substrate inhibition due to stearyl alcohol has been obser
出处
《日用化学品科学》
CAS
1999年第3期1-4,12,共5页
Detergent & Cosmetics
关键词
脂介酶
无溶剂系统
酯交换
蜡酯
脂肪酸酯
lipozymesolvent-free systemtransesterificationvegetable oilswax estersved.A study of kinetic parameters has confirmed these results.
