Thermal transition and state diagram of yacon dried by combined heat pump and microwave method

被引：16

作者：

Shi, Qilong ^{[1
]}

Zheng, Yaqin ^{[1
]}

Zhao, Ya ^{[1
]}

机构：

[1] Shandong Univ Technol, Sch Agr Engn & Food Sci, Zibo 255049, Shandong, Peoples R China

来源：

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2015年 / 119卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Glass transition temperature; State diagram; Differential scanning calorimetry; Adsorption isotherm; Yacon; WATER SORPTION ISOTHERMS; GLASS-TRANSITION; SMALLANTHUS-SONCHIFOLIUS; FOOD; TEMPERATURE; STABILITY; SLICES; FRUITS; VEGETABLES; SHRINKAGE;

D O I：

10.1007/s10973-014-4198-0

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Adsorption isotherm and thermal transition of yacon dried by combined heat pump and microwave method were developed to investigate the interactions between water and biopolymers. Adsorption isotherm of yacon was determined by the gravimetric method, and the data were modeled by GAB model. The GAB monolayer moisture content was observed to be 0.0795 g H2O g(-1) dry solids. Thermal transitions of yacon powders equilibrated at various water activities were analyzed using differential scanning calorimetry. The state diagram was developed using glass transition line and freezing curve, which were modeled by Gordon-Taylor equation and Clausius-Clapeyron equation, respectively. The maximal-freeze-concentrated condition was estimated as the solid content of 0.706 g g(-1) yacon with the glass transition temperature of -66.6 degrees C. The adsorption properties and state diagram of yacon are useful in optimizing conditions of freezing and drying of yacon as well as in evaluating its storage stability as a function of moisture content and temperature.

引用

页码：727 / 735

页数：9

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