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KMID : 1134820090380070879
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Journal of the Korean Society of Food Science and Nutrition
2009 Volume.38 No. 7 p.879 ~ p.884
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Changes of Chlorophyll and SOD-like Activities of Chinese Chives Dehydrated at Different Heat Treatments
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Kwak Yeon-Ju
Kim Jeong-Sang
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Abstract
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Allium tuberosum Rotter (Liliaceae, Chinese chives) is a perennial herb of which leaves are used for food. This study investigated the effect of pretreatment on quality of dehydrated Chinese chives. Chinese chives was blanched at 80℃ for 20 sec, followed by drying at 70℃, 80℃, 100℃, or drying at 100℃ for 30 min and subsequent drying at 70℃, or 100℃ for 60 min and subsequent drying at 70℃. Optimum drying temperature and time was 100℃ for 30 min and subsequent drying at 70℃, or 100℃ for 60 min and subsequent drying at 70℃. These conditions were shortened time for dehydration and showed smaller decrease than others in Hunter color L, a, b. Dehydrated Chinese chives showed a constant decrease in greenness with storage, probably due to destruction of chlorophyll by light. In the measurement of Hunter color L, a, b, these conditions showed smaller decrease than others in Hunter color for 15 week storage. Chlorophyll content and SOD (superoxide dismutase)- like activity in that condition was higher than others. It was assumed that a phenolic compound that forms its thermostable activity. The fitness of drying models was conducted in order to explain reducing chlorophyll loss and SOD (superoxide dismutase)-like activity loss. Based upon the chlorophyll content, SOD-like activity, and retention of green color of the vegetable, optimum drying conditions was 100℃ for 30 min followed by 100℃ for 30 min and subsequent drying at 70℃, or 100℃ for 60 min and subsequent drying at 70℃.
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KEYWORD
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dehydrated Chinese chives, chlorophyll, SOD-like activity
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