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Comparison of pulsed vacuum and ultrasound osmotic dehydration on drying of Chinese ginger (Zingiber officinale Roscoe): Drying characteristics, antioxidant capacity, and volatile profiles

文献类型： 外文期刊

作者： An, Kejing 1 ; Tang, Daobang 1 ; Wu, Jijun 1 ; Fu, Manqin 1 ; Wen, Jing 1 ; Xiao, Gengsheng 1 ; Xu, Yujuan 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Guangdong Key Lab Agr Prod Proc, Key Lab Funct Foods, Minist Agr,Sericulture & Agrifood Res Inst, Guangzhou, Guangdong, Peoples R China

关键词： antioxidant activity; ginger (Zingiber officinale Roscoe); intermittent microwave & air-drying; microstructure; PPO and POD activity; volatiles

期刊名称：FOOD SCIENCE & NUTRITION （ 影响因子：2.863； 五年影响因子：3.141 ）

ISSN： 2048-7177

年卷期：

页码：

收录情况： SCI

摘要： The effects of pulsed vacuum osmotic dehydration (PVOD) and ultrasound osmotic dehydration (USOD) on drying characteristics and quality attributes of ginger were investigated. PVOD was subjected to pulsed vacuum at 13 kPa for 30 min, and USOD was subjected to ultrasound with the frequency of 40 kHz for 30 min. After PVOD and USOD treatments, the samples were then dried at intermittent microwave & air-drying oven with an output of 700 W and temperature of 60 degrees C to the final moisture content of 0.12 g water/g d.w. The results showed PVOD and USOD treatments could improve the total phenolic contents by -1.8% to 16.4%, total flavonoid content by 7.7%-18.7%, DPPH radical scavenging by 9.5%-12.2%, and ABTS+ antioxidant activity by 17.8%-27.4%, although they prolonged the later stages drying of ginger. Besides, the PVOD- and USOD-pretreated dried samples had less brownings than the untreated-dried samples which could be attributed to the inactivation of polyphenol oxidase (PPO) and peroxidase (POD). The PPO activity was significantly reduced in the PVOD and USOD ginger, whereas POD activity was decreased in USOD ginger but increased in PVOD ginger. Moreover, PVOD pretreatment also led to a better preservation of volatile profiles and cell structure than USOD treatment. Therefore, both PVOD and USOD are effective pretreatments for drying of ginger.

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