作　　者： ; ; ; ; (万紫媛）;

机构地区： 华南农业大学食品学院

出　　处： 《现代食品科技》 2015年第8期177-183 198,共8页

摘　　要： 利用耗散粒子动力学(DPD)方法对吐温80/正构醇(C2~C8)/丁酸乙酯/水四组分微乳体系形成过程进行了模拟,研究了醇类浓度及烃链长度对微乳形成过程相行为及微观结构的影响。研究发现:正构醇浓度和烷烃链长度对体系自组装形态变化有显著影响,当醇类浓度较低时,微乳粒径随醇浓度的增大而增大,当浓度增加到一定程度后,继续增加醇浓度则导致微乳形态从球状依次变为管道状、网格状;通过比较不同烷烃链长的微乳体系发生形态变化时醇的浓度大小,发现醇烷烃链长的增加促使微乳体系在醇浓度较低时就发生形态转变,且体系界面张力较快趋于稳定。同时,研究发现醇链长的增加会使吐温80/正构醇/丁酸乙酯/水体系的W/O型和双连续型微乳区增大。该结果为微乳类型及形态尺寸的调控从而实现蛋白质的选择性萃取提供指导。 The Tween80/n-alkanol(C2~C8)/ethyl butyrate/water four-component microemulsion system was simulated using the dissipative particle dynamics(DPD) method. Effect of n-alkanol concentration and n-alkanol alkyl chain length on the phase behavior and microstructure during the formation of microemulsion was also studied. The simulation results indicated that the concentration and alkyl chain length of n-alkanol greatly affected morphological changes in the self-assembly of the system. When the n-alkanol concentration was low, particle size of the microemulsion increased with an increase in alcohol concentration. After the n-alkanol concentration was increased to a certain extent, a further increase in concentration led to a change in the structure of microemulsion from spherical shape to pipe-like and net-like shapes. A comparison of the n-alkanol concentrations when morphological changes occurred in microemulsion systems with different alkyl chain lengths revealed that an increase in alkyl chain length of n-alkanol promoted morphological changes in the microemulsion system at low n-alkanol concentrations and the interfacial tension of the system stabilized rapidly. In addition, the results showed that increasing chain length of alcohol increased the water/oil(W/O) and bicontinuous microemulsion region of Tween80/n-alkanol(C2~C8)/ethyl butyrate/water system. This result provides guidance for the control of type, morphology, and size of the microemulsion system, to thus achieve selective extraction of proteins.

关 键 词： 介观模拟 微乳体系 表面活性剂 界面张力 相变

领　　域： [理学] [理学]