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    Please use this identifier to cite or link to this item: http://asiair.asia.edu.tw/ir/handle/310904400/16100

    Title: Effects of blanching, drying and extraction processes on the antioxidant activity of yam (Dioscorea alata).
    Authors: 王建國;Wang, Chien-Kuo
    Contributors: 生物科技學系
    Keywords: Antioxidant;blanching;drying;peel;yam
    Date: 2008
    Issue Date: 2012-11-23 17:08:33 (UTC+8)
    Abstract: The effects of blanching, drying and extraction processes on the antioxidant activities of one kind of Taiwanese yam peel, Darsan (Dioscorea alata), were investigated. The antioxidant measurements included total phenolic content, reducing power and α ,α-diphenyl-β-pricryl-hydrazyl (DPPH) radical-scavenging activity. The 50% ethanolic, hot water and water extracts from the peel all had much higher antioxidant activities than those extracts from the flesh. Among three extraction methods, 50% ethanolic extraction resulted in the highest antioxidant activities in the peel, while hot water extraction was more appropriate for the flesh. Blanching by immersing the peel in 85 °C water for 30 s caused significant reductions in the antioxidant activities of all the extracts from the peel. Generally speaking, freeze-dried peel maintained higher antioxidant activities than hot air-dried peel.
    Appears in Collections:[生物科技學系] 期刊論文

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