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Changes in invertase activities and reducing sugar content in sweetpotato stored at different temperatures

Author:
Huang, Y.H., Picha, D.H., Kiliki, A.W., Johnson, C.E.
Source:
Journal of agricultural and food chemistry 1999 v.47 no.12 pp. 4927-4931
ISSN:
0021-8561
Subject:
cultivars, reducing sugars, sweet potatoes, glucose, storage temperature, Ipomoea batatas, beta-fructofuranosidase, storage, fructose, enzyme activity, postharvest physiology
Abstract:
Cured sweetpotato roots were stored at different temperatures (4.5, 15.6, and 24 degrees C) for 7 weeks and assayed for invertase activities and reducing sugar levels during two separate years. Invertase activities and reducing sugar concentration significantly increased in the roots kept at low temperature. Of the three types of invertases assayed, acid invertase specific activity was the highest. Acid invertase was the most influential in determining reducing sugar levels in stored sweetpotato. Cultivar differences were found in invertase specific activities and reducing sugar concentration. Reducing sugar content was highly correlated to acid and total invertase activity, regardless of cultivar.
Agid:
1372165