Acta Univ. Agric. Silvic. Mendelianae Brun. 2014, 62(5), 1125-1134 | DOI: 10.11118/actaun201462051125

Effects of Pretreatments and Drying Temperatures on Drying Characteristics, Antioxidant Properties and Color of Ginger Slice

Ratiya Thuwapanichayanan1, Charotorn Phowong1, Donludee Jaisut1, Jiøí ©tencl2
1 Department of Farm Mechanics, Faculty of Agriculture, Kasetsart University, Bangkok 10900, Thailand
2 Department of Agricultural, Food and Environmental Engineering, Mendel University in Brno, Zemìdìlská 1, 613 00 Brno, Czech Republic

To reduce the adverse effects of hot air drying, ginger slices were pretreated prior to drying. The effects of 2 pretreatment methods (blanching versus dipping in 0.1% ascorbic acid solution) and drying temperatures (60, 70 and 80 °C) on the drying characteristics and the qualities of the dried ginger slices in terms of total phenolic content (TPC), antioxidant activities (DPPH and ABTS methods) and color were investigated. It was noted that the moisture content for both un-pretreated and pretreated samples decreased more rapidly when drying was performed at higher drying temperatures. However, the drying time of un-pretreated and pretreated samples was not significantly different. The TPC and antioxidant activities of the ginger slices increased markedly after drying. The increase in these values was higher for pretreated samples. The dried ascorbic acid solution dipped sample exhibited the highest values of TPC and antioxidant activity. Moreover, the total color difference of the ascorbic acid solution dipped ginger was slightly lower than the total color difference of the un-pretreated ginger. However, the tested drying temperatures, ranging from 60 to 80 °C, did not affect the final TPC, antioxidant activities, and color of the ginger samples.

Keywords: antioxidant activity, ascorbic acid, blanching, color, drying, ginger, phenolic content
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The authors express their appreciation to the Kasetsart University Research and Development Institute and the Graduate School Kasetsart University for the financial support.

Published: December 2, 2014  Show citation

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Thuwapanichayanan, R., Phowong, C., Jaisut, D., & ©tencl, J. (2014). Effects of Pretreatments and Drying Temperatures on Drying Characteristics, Antioxidant Properties and Color of Ginger Slice. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 62(5), 1125-1134. doi: 10.11118/actaun201462051125
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