Ultrasound pre-treatment prior to unripe banana air-drying: effect of the ultrasonic volumetric power on the kinetic parameters

被引:0
|
作者
Carla I. A. La Fuente
Carmen C. Tadini
机构
[1] University of São Paulo,Department of Chemical Engineering, Escola Politécnica
[2] University of São Paulo,Food Research Center (FoRC/NAPAN)
来源
Journal of Food Science and Technology | 2018年 / 55卷
关键词
Kinetics; Water effective diffusivity; Activation energy; Drying curves;
D O I
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中图分类号
学科分类号
摘要
Aiming to decrease the water content during the air-drying process of unripe banana slices, ultrasound (US) pre-treatments (25 °C) for 20 and 25 min at 9.38 and 25.63 W/L ultrasonic volumetric power were evaluated. Air-drying was performed at 50 and 60 °C for 360 min. Unripe banana slices pretreated at 25.63 W/L did not improve water migration, under either air-drying temperature, while slices pretreated at 9.38 W/L resulted in an increase in water effective diffusivity of 4.8 and 13.7% at 20 min US + air-drying at 50 °C and 25 min US + air-drying at 60 °C, respectively. The drying time saving of 7% and 9%, respectively, was achieved, showing that these treatments were alternative for processing unripe banana slices. Thus, ultrasound and air-drying operational parameters required accurately defined to achieve desirable results. Experimental data were adjusted to four models and the Midilli model resulted in the best experimental data fit, with r2 > 0.9988, RMSE < 0.0873 and χ2 < 0.00996.
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页码:5098 / 5105
页数:7
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