Glennie, C.W. (1981) Preharvest changes in polyphenols, peroxidase, and polyphenol oxidase in sorghum grain. Journal of Agricultural and Food Chemistry, 29 (1). pp. 33-36.
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Abstract
At various stages of preharvest development. "bird-resistant" sorghum (Sorghum bicolor (I,.) Moench] grain was analyzed for tannin content and polyphenol oxidizing enzymes. Tannins appeared first at the milk stage, reached a maximum at the hard dough stage, and thereafter declined by 25%. Polyphenol oxidase (PPO) and peroxidase activities were detected during the flowering stage. PPO activity declined rapidly as the grain began to develop while the decline of peroxidase was slower. Neither activity could be detected in mature grain. Both enzymes were characterized and PPO behaved as a catechol oxidase. It appeared that these enzymes were not responsible for tannin deposition in sorghum grain. The decrease in extractable tannin was attributed to the high molecular weight tannin complexing with cellular components to become insoluble.
| Item Type: | Article |
|---|---|
| Author Affiliation: | Sorghum Breeding Unit, National Food Research Institute, Couucil for Scientific and Industrial Research, Pretoria, 0001, South Africa |
| Subjects: | Crop Improvement > Seed Technology |
| Divisions: | Sorghum |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 23 Feb 2012 09:29 |
| Last Modified: | 23 Feb 2012 09:29 |
| Official URL: | http://dx.doi.org/10.1021/jf00103a009 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/3188 |
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