期刊
DRYING TECHNOLOGY
卷 35, 期 11, 页码 1312-1326出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/07373937.2017.1319854
关键词
Color parameters; PVD-EPC; PVD-FIR; volatile compounds; Weibull distribution model; wolfberry
资金
- Project in the National Science & Technology Pillar Program during the Twelfth Five-year Plan Period [2015BAD19B010201]
- National Natural Science Foundation of China [31501548]
- Chinese Transformation Fund of Agricultural Scientific and Technological Achievements [2014GB2G410112]
The drying kinetics and quality attributes of wolfberry were investigated under pulsed vacuum drying based on two different heating ways of far-infrared radiation (PVD-FIR) and electronic panel contact (PVD-EPC) heating. They were operated at different drying values of heating panel temperatures (60, 65, and 70 degrees C) with 15 and 2min as the constant vacuum pressure and atmospheric pressure duration, respectively. Drying time for wolfberry dried by PVD-FIR was lower by 17-19% compared with that by PVD-EPC at the same drying temperature. The effective moisture diffusivity (D-eff) determined by Weibull distribution model ranged from 3.72x10(-10) to 6.59x10(-10)m(2)/s and 3.34x10(-10) to 6.88x10(-10)m(2)/s for PVD-FIR and PVD-EPC, respectively. The drying activation energy was 54.30 and 68.59kJ/mol for the samples dried by PVD-FIR and PVD-EPC, respectively. The color parameters L*, a*, and b* of wolfberry dried by PVD-FIR were higher than those dried by PVD-EPC. The product dried by PVD-FIR contained more vivid luster compared to that dried by PVD-EPC. The contents of aldehydes, esters, phenols, and the heterocyclic compound in PVD-FIR sample were higher than those in PVD-EPC samples. Additionally, the alcohols, ketones, and acid contents in PVD-FIR sample were lower than those in PVD-EPC sample. In summary, PVD-FIR is more suitable for wolfberry drying as it enhances drying rate and product's quality compared with PVD-EPC.
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