Cereal Chem 56:314 - 316.  |  VIEW ARTICLE
Grain Sorghum Condensed Tannins. II. Preharvest Changes.

A. B. Davis and R. C. Hoseney. Copyright 1979 by the American Association of Cereal Chemists, Inc. 

Condensed tannins from three varieties of bird-resistant grain sorghum were analyzed over 10 weeks before and at harvest to determine differences in alpha-amylase inhibitory activity and changes in composition of the condensed tannins. Composition of the condensed tannin fractions was determined by gel filtration on Sephadix LH-20. Compositional differences were noted among condensed tannins from the three grain varieties and among tannins extracted from the same variety harvested at different dates. For all varieties, enzyme inhibition determined on a per kernel basis rose gradually until six weeks before harvest. Thereafter, one variety maintained a constant level of inhibition; the other two varieties lowered their inhibition levels but at different rates.