文献类型： 外文期刊
作者： Lagnika, Camel 1 ; Huang, Jiapeng 1 ; Jiang, Ning 1 ; Li, Dajing 1 ; Liu, Chunquan 1 ; Song, Jiangfeng 1 ; Wei, Qiuyu; 1 ;
作者机构： 1.Jiangsu Acad Agr Sci, Inst Farm Prod Proc, Nanjing 210014, Jiangsu, Peoples R China
2.Univ Natl Agr, Ecole Sci & Tech Conservat & Transformat Prod Agr, Porto Novo, Benin
3.Jiangnan Univ, State Key Lab Food Sci & Technol, Wuxi, Peoples R China
关键词： Drying; microwave vacuum; osmotic dehydration; sweet potato; ultrasound
期刊名称：DRYING TECHNOLOGY （ 影响因子：4.452； 五年影响因子：4.034 ）
ISSN： 0737-3937
年卷期： 2018 年 36 卷 11 期
页码：
收录情况： SCI
摘要： The effects of pretreatment before microwave vacuum drying (MVD) on texture, color, expansion, rehydration, drying rate, microstructure, sensory evaluation, and other properties of sweet potato were investigated in this study. The pretreatment consisted in five processing conditions, using blanching; osmotic dehydration at 35 degrees Brix of sucrose (OD); ultrasound in distilled water (US); ultrasound in distilled water before osmotic dehydration (US + OD), and ultrasound-assisted osmotic dehydration (USOD). Pretreatments of sweet potato before MVD have shown success in reducing drying time with US treatment relatively more effective regarding drying time than other treatments. Compared with other treatments, US showed the highest rehydration ratio values. The osmotic group pretreatment exhibited a pronounced effect on water loss and solid gain, improved the color, aroma, and taste of dried sweet potato, whereas sucrose impregnation resulted in a hard texture observed with OD sample. USOD samples had a higher expansion ratio, lower hardness and color difference values, appeared less cell damaged, and recorded better overall quality than the other samples. There was a slight difference between USOD and US + OD samples. Combining osmotic dehydration with ultrasound as a pretreatment can significantly accelerate the heat transfer rate, reducing the dried time accordingly and increasing energy efficiency.
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