Pulsed vacuum drying enhances drying kinetics and quality of lemon slices

文献类型： 外文期刊

第一作者： Wang, Jun

作者： Wang, Jun;Liu, Zi-Liang;Deng, Li-Zhen;Gao, Zhen-Jiang;Xiao, Hong-Wei;Law, Chung-Lim;Nema, Prabhat K.;Zhao, Jin-Hong

作者机构：

关键词： Lemon slice;Pulsed vacuum drying;Shrinkage;Rehydration kinetics;Color profiles

期刊名称：JOURNAL OF FOOD ENGINEERING （ 影响因子：5.354； 五年影响因子：5.144 ）

ISSN： 0260-8774

年卷期： 2018 年 224 卷

页码：

收录情况： SCI

摘要： The effect of drying temperature (60, 65, 70, and 75 degrees C) on drying characteristics, shrinkage, rehydration kinetics, microstructure and color profiles of lemon slices were investigated using a far-infrared radiation heating assisted pulsed vacuum dryer. Results showed that the drying time of lemon slices was reduced from 10.5 to 5.5 h when the drying temperature was increased from 60 to 75 degrees C. Weibull model could precisely describe the drying of samples under different drying temperatures (R-2>0.99). Moisture effective diffusivity (D-eff), which was determined by taking shrinkage effect into consideration, varied with moisture content. At the initial drying stages, the volume shrinkage of samples followed a linear relationship with decreasing moisture content as the volume shrinkage is approximately equal to the volume of evaporated water. Microstructure observation illustrated that the "skeleton" was fixed when moisture content decreased to approximate 60% w.b. Page model could well model the rehydration kinetics (R-2> 0.98). In terms of color evaluation, temperature of 75 degrees C significantly caused color deterioration and it recorded the highest color change (Delta E) of 14.23, Browning Index (BI) of 27.14 and lowest Hue Angle (H-0) of 79.46. The findings indicate that FIR-pulsed vacuum drying is a promising alternative method for lemon slices as it can enhance drying process as well as preserve the quality attributes of lemon slices. (C) 2018 Elsevier Ltd. All rights reserved.

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