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Ding S.H.,China Agricultural University | Ding S.H.,Technology Research Center for Fruits and Vegetable Processing | Ding S.H.,Key Laboratory of Fruits and Vegetables Processing | An K.J.,China Agricultural University | And 14 more authors.
Food and Bioproducts Processing | Year: 2012

Fresh ginger slices were dehydrated by air drying (AD), microwave drying (MD), vacuum drying (VD), and freezing drying (FD). Volatiles were extracted from fresh ginger pulp and dried ground ginger powder with solid-phase microextraction (SPME), and identified by gas chromatography-mass spectrometry (GC-MS). Results indicated that, 19, 28, 21, 20, 31 and 20 novel compounds (70 in total) appeared in dried gingers treated by AD at 50, 60 and 70°C, MD at 60 W, VD in 13.3 kPa at 60°C and FD in 0.203 kPa at chamber temperature of 22°C, respectively. Principal component analysis for the main volatiles indicated that drying increased the relative contents of benzene,1-(1,5- dimethyl-4-hexenyl)-4-methyl-, 1,3-cyclohexadiene,5-(1,5-dimethyl-4-hexenyl)-2- methyl-,[S-(R*,S*)]-, α-farnesene and cyclohexene,3-(1,5- dimethyl-4-hexenyl) -6-methylene-,[S-(R*,S*)]- while decreased those of 2,6-octadienal,3,7-dimethyl-,(Z) and 2,6-octadienal,3,7-dimethyl-. Cluster analysis disclosed that MD was the most favorite drying way, followed by AD at 60°C, VD, FD, and AD at 50 and 70°C. © 2011 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

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