Condensed tannin,an antibiotic chemical from Gossypium hirsutum |
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| Authors: | Bock G Chan AC Waiss M Lukefahr |
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| Institution: | Western Regional Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Berkeley, California 94710, U.S.A.;Cotton Insects Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Brownsville, Texas, U.S.A. |
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| Abstract: | Antibiotic activity against Heliothis virescens was found in flower buds of Gossypium hirsutum, experimental stock Texas 254. Relatively low antibiotic activity was found in hexane extract, high activity in methanolic extract and residue, and no activity in acetone and water extracts. A condensed tannin having a molecular weight of 4850 was isolated from methanolic extract by column chromatography on Sephadex G-25. It was the major antibiotic component, 3.4% of the dried flower bud. The condensed tannin at 0.2% in the diet retarded larval growth by 84%. |
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