Aspergillus flavus strains were obtained from British and domestic sources, and were cultured in our laboratories. Aflatoxin, the toxic derivative, was extracted from peanut meal by the method of Sargeant, et al. and from wheat by our method. The amounts of toxic substances present were estimated by paper chromatography. Concentrates were obtained by precipitation. One concentrate was reduced. Toxicity tests on ducklings confirmed British findings.
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Armbrecht et al. (1963) studied this question.