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標題: Chemical compositions and enzyme activity changes occurring in yam (Dioscorea alata L.) tubers during growth
作者: Huang, C.C.
Chiang, P.Y.
Chen, Y.Y.
Wang, C.C.R.
關鍵字: Dioscorea alata
yam tubers
chemical compositions
enzyme activity
dioscorin content
essential amino acids
taro colocasia-esculenta
期刊/報告no:: Lwt-Food Science and Technology, Volume 40, Issue 9, Page(s) 1498-1506.
摘要: The purpose of this study was to establish the chemical compositions, enzyme activity and nutritional values of four cultivars of yam tubers at different stages of their maturation, and compare such levels during yam growth. The results have indicated that yam tubers featured a reasonably substantial content of protein when compared with other root and tuber crops, the protein content being of the order of 10.4-13.0g/100g (dry basis (db)) at time of harvest (day 260 post-emergence). Starch content of the four yam tubers increased as growth progressed and remained in the range of 70.5-85.3g/100g (db) during their growth period. The activity of yam-contained polyphenol oxidase (PPO) decreased remarkably over the early period of harvest (day 155-225 post-emergence), and subsequently decreased only slightly as growth progressed to harvest for all tested species of yam with the exception of CH yam tubers. Contrasting this, however, the activity of alpha-amylase increased significantly over the growth period for all cultivars, and dioscorin content of yam tuber also increased as growth progressed for all cultivars. All yam cultivars contained remarkably substantial amounts of essential amino acids, all of which were superior to the FAO reference pattern for such amino acids except for sulfur-containing amino acids and lysine contents. (c) 2007 Swiss Society of Food Science and Technology. Published by Elsevier Ltd. All rights reserved.
ISSN: 0023-6438
Appears in Collections:食品暨應用生物科技學系



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