𝔖 Bobbio Scriptorium
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Isoflavone contents of red and subterranean clovers

✍ Scribed by E. Wong

Publisher
John Wiley and Sons
Year
1963
Tongue
English
Weight
313 KB
Volume
14
Category
Article
ISSN
0022-5142

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✦ Synopsis

Abstract

The concentrations of the isoflavones biochanin A, genistein, formononetin, pratensein and daidzein in leaves of four varieties of red clover and two of subterranean clover have been measured by a paper chromatographic‐spectrophotometric method.

Biochanin A and formononetin are the predominant isoflavones in red clovers whereas biochanin A and genistein are the most abundant in subterranean clovers. For both species the isoflavone levels differed between varieties and between sampling dates. Higher levels were found during flowering for red clovers and before flowering for subterranean clovers.

The isoflavone contents have been calculated to have oestrogenic activity equivalent to 2–17 ΞΌg. of stilboestrol (% dry wt.) for the red clover samples and 22–48 ΞΌg. of stilboestrol (% dry wt.) for the subterranean clover samples. The potency of some of these samples is much higher than potencies previously reported in the literature.

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