母乳脂替代品的分子蒸馏脱酸工艺研究

Molecular distillation deacidification of human milk fat substitutes

采用分子蒸馏技术对由脂肪酶Lipozyme RM IM催化猪板油和油茶籽油脂肪酸甲酯制备的母乳脂替代品(HMFS)粗产物进行了脱酸工艺研究。在单因素试验的基础上,通过Box-Behnken响应面试验对工艺条件进行优化。结果表明,最优工艺条件为温度209℃、刮膜转速180 r/min、进料速度2 m L/min,在此条件下,重相分离所得HMFS酸值(KOH)为0.036 mg/g,得率可达49.19%。HMFS的主要融熔峰在4.68℃,HMFS甘油三酯脂肪酸组成中的C16∶0有69.98%分布在Sn-2位上。

The deacidification of the crude products of human milk fat substitutes（HMFS） which were prepared by lard and oil-tea camellia seed oil fatty acid methyl esters catalyzed by Lipozyme RM IM was carried out by molecular distillation. Based on the single factor experiment, the Box-Behnken response surface experiment was used to optimize the process conditions. The optimal operation conditions were obtained as follows： temperature 209？℃,rotation speed 180 r/min and feed speed 2 mL/min. Under these conditions, the acid value of the heavy phase was 0.036 mgKOH/g, and the yield of HMFS was 4919%. The main melting peak of HMFS was 4.68？℃. The relative content of C16∶？0 at Sn-2 position of HMFS reached 69.98%.