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Power ultrasound as a pretreatment to convective drying of mulberry (Morus alba L.) leaves: Impact on drying kinetics and selected quality properties

文献类型： 外文期刊

作者： Tao, Yang 1 ; Wang, Ping 1 ; Wang, Yilin 1 ; Kadam, Shekhar U. 2 ; Han, Yongbin 1 ; Wang, Jiandong 1 ; Zhou, Jianzhong 3 ;

作者机构： 1.Nanjing Agr Univ, Coll Food Sci & Technol, Nanjing 210095, Jiangsu, Peoples R China

2.Univ Coll Dublin, UCD Sch Biosyst & Food Engn, Dublin 4, Ireland

3.Jiangsu Acad Agr Sci, Inst Agroprod Proc, Nanjing 210014, Jiangsu, Peoples R China

关键词： Ultrasound pretreatment;Mulberry leaves;Convective drying;Drying kinetics;Quality property

期刊名称：ULTRASONICS SONOCHEMISTRY （ 影响因子：7.491； 五年影响因子：7.537 ）

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收录情况： SCI

摘要： The effect of ultrasound pretreatment prior to convective drying on drying kinetics and selected quality properties of mulberry leaves was investigated in this study. Ultrasound pretreatment was carried out at 25.2-117.6 W/L for 5-15 min in a continuous mode. After sonication, mulberry leaves were dried in a hot-air convective dryer at 60 degrees C. The results revealed that ultrasound pretreatment not only affected the weight of mulberry leaves, it also enhanced the convective drying kinetics and reduced total energy consumption. The drying kinetics was modeled using a diffusion model considering external resistance and effective diffusion coefficient D-e and mass transfer coefficient h(m) were identified. Both D-e and h(m) during convective drying increased with the increase of acoustic energy density (AED) and ultrasound duration. However, D-e and h(m) increased slowly at high AED levels. Furthermore, ultrasound pretreatment had a more profound influence on internal mass transfer resistance than on external mass transfer resistance during drying according to Sherwood numbers. Regarding the quality properties, the color, antioxidant activity and contents of several bioactive compounds of dried mulberry leaves pretreated by ultrasound at 63.0 W/L for 10 min were similar to that of mulberry leaves without any pretreatments. Overall, ultrasound pretreatment is effective to shorten the subsequent drying time of mulberry leaves without damaging the quality of final product. (C) 2016 Elsevier B.V. All rights reserved.

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