Abstract

The seed of Pachyrrhizus erosus, commonly known as the yam bean, was examined several years ago as a possible commercial source of rotenone. Although the rotenone content is too small to make the seed of economic importance, several other poisonous substances are present, including pachyrrhizid, pachyrrhizone, erosone, and at least two saponins. The fatty oil, which constitutes about 20 per cent of the seed, is high in saturated glycerides and is nondrying. The unsaponifiable portion, about 1 per cent of the oil, contains saturated hydrocarbons and several phytosterols.

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