Microwave airflow drying of pecans at variable microwave power

文献类型： 外文期刊

第一作者： Zhang, Jigang

作者： Zhang, Jigang;Liu, Xinmin;Li, Maoye;Ding, Zhien;Cheng, Jianghua;Yang, Song

作者机构：

期刊名称：JOURNAL OF FOOD PROCESS ENGINEERING （ 影响因子：2.356； 五年影响因子：2.417 ）

ISSN： 0145-8876

年卷期： 2019 年 42 卷 1 期

页码：

收录情况： SCI

摘要： In this study, the dielectric properties of two varieties of pecan nuts at different moistures (10-30% w.b.), temperatures (25-85 degrees C) were determined and the effect of microwave (MW) power density (0.8-2.6 W/g) and exposure time (30-300 s) on moisture content of pecan were approximated by response surface analysis. According to a comprehensive assessment of these results, phased varying power design for MW-assisted air drying (PPMAD) was appropriate designed to dry pecan nuts. The result indicated that the penetration depths of MW at 2,455 MHz to pecan nuts was distributed in the range of 4.05-10.45 cm in terms of different moisture content and temperature. The moderate output power density (1.7 W/g) is an optimized parameter during the primary stage of MW drying. In PPMAD scheme, 1.7 W/g was delivered in first 150 s, followed by cooling 30 s, and 2.6 W/g was applied in the final 120 s. The results showed that the hybrid drying of PPMAD was efficacious, leading to water losses of 19% in pecan and 16% in hickory without affecting their major compositions and sensory qualities. Further preservation showed that the oxidation degree of PPMAD-dried nuts was lower than that of the control after 90 days of storage.

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