Effect of Thermosonic Pretreatment and Microwave Vacuum Drying on the Water State and Glass Transition Temperature in Agaricus bisporus Slices
文献类型： 外文期刊
作者： Jiang, Ning 1 ; Liu, Chunquan 1 ; Li, Dajing 1 ; Zhang, Jing; Zhang, Zhongyuan 1 ; Huang, Jiapeng 1 ; Yu, Zhifang;
作者机构： 1.Jiangsu Acad Agr Sci, Inst Farm Prod Proc, Nanjing 210014, Jiangsu, Peoples R China
2.Jiangsu Acad Agr Sci, Jiangsu Key Lab Hort Crop Genet Improvement, Nanjing 210014, Jiangsu, Peoples R China
3.Nanjing Agr Univ, Coll Food Sci & Technol, Nanjing 210
关键词： Water state;Glass transition temperature;Thermosonic pretreatment;Microwave vacuum drying (MVD);Low-field nuclear magnetic resonance (LF-NMR);Magnetic resonance imaging (MRI)
期刊名称：FOOD AND BIOPROCESS TECHNOLOGY （ 影响因子：4.465； 五年影响因子：4.793 ）
ISSN： 1935-5130
年卷期： 2018 年 11 卷 1 期
页码：
收录情况： SCI
摘要： This study aimed to understand the micromechanism of thermosonic pretreatment and microwave vacuum drying on Agaricus bisporus. The water state and glass transition temperature (T-g ) of fresh and thermosonically treated Agaricus bisporus slices during microwave vacuum drying were studied using differential scanning calorimetry (DSC), low-field nuclear magnetic resonance (LF-NMR), and magnetic resonance imaging (MRI). Results showed that four population groups were contained in the initial distribution of transverse relaxation time (T-2) data of fresh A. bisporus slices: T-21 (0.38-7.05 ms), T-22 (9.33-32.75 ms), T-231 (37.65-265.61 ms), and T-232 (305.39-811.13 ms). Thermosonic pretreatment significantly decreased the initial free water content of A. bisporus sample but was accompanied by a sharp increase in its immobilized water. "Semi-bound water transfer" appeared during microwave vacuum drying (MVD) at moisture contents (X-w ) of 0.70 and 0.60 g/g (wet basis (w.b.)) for untreated and thermosonically treated samples, respectively. MVD caused dramatic changes in the water state and enhanced the T-g by decreasing the content and mobility of immobilized water in A. bisporus tissues. The mobility of semi-bound water for thermosonically and MVD-treated samples was higher than for MVD-untreated samples, resulting in T-g values decreasing by approximately 2-11.5 A degrees C, but the uniformity of water distribution in thermosonic-treated and MVD-treated samples was better at X-w <= 0.52 g/g (w.b.).
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