收缩率
褐变
含水量
体积热力学
水分
动力学
热扩散率
材料科学
化学
冷冻干燥
复合材料
食品科学
色谱法
热力学
物理
工程类
量子力学
岩土工程
作者
Jun Wang,Chung Lim Law,Prabhat K. Nema,Jinhong Zhao,Zi-Liang Liu,Li‐Zhen Deng,Zhen-Jiang Gao,Hong‐Wei Xiao
标识
DOI:10.1016/j.jfoodeng.2018.01.002
摘要
The effect of drying temperature (60, 65, 70, and 75 °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 °C. Weibull model could precisely describe the drying of samples under different drying temperatures (R2 > 0.99). Moisture effective diffusivity (Deff), 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 (R2 > 0.98). In terms of color evaluation, temperature of 75 °C significantly caused color deterioration and it recorded the highest color change (ΔE) of 14.23, Browning Index (BI) of 27.14 and lowest Hue Angle (H0) 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.
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