Microstructure characterization of a food-grade U-type microemulsion system by differential scanning calorimetry and electrical conductivity techniques

被引:37
作者
Zhang, Hui [1 ]
Taxipalati, Maierhaba [1 ]
Que, Fei [2 ]
Feng, Fengqin [1 ]
机构
[1] Zhejiang Univ, Dept Food Sci & Nutr, Hangzhou 310058, Zhejiang, Peoples R China
[2] Zhejiang Econ & Trade Polytech, Dept Appl Engn, Hangzhou 310018, Zhejiang, Peoples R China
基金
中国博士后科学基金;
关键词
Microemulsion; Microstructure; Differential scanning calorimetry; Electrical conductivity; DSC;
D O I
10.1016/j.foodchem.2013.05.141
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The microstructure transitions of a food-grade U-type microemulsion system containing glycerol monolaurate and propionic acid at a 1:1 mass ratio as oil phase and Tween 80 as surfactant were investigated along a water dilution line at a ratio of 80:20 mass% surfactant/oil phase, based on a previously studied phase diagram. From the water thermal behaviours detected by differential scanning calorimetry, three structural regions are identified along the dilution line. In the first region, all water molecules are confined to the water core of the reverse micelles, leading to the formation of w/o microemulsion. As the water content increases, the water gains mobility, transforms into bicontinuous in the second region, and finally the microemulsion become o/w in the third region. The thermal transition points coincide with the structural phase transitions by electrical conductivity measurements, indicating that the structural transitions occur at 35 and 65 mass% of water along the dilution line. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码:3050 / 3055
页数:6
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