The soapnuts contain saponins which are a natural surfactant. It is a rich source of saponins. It contains saponin A, saponin C, sapindosid A, sapindosid B, emarginatoside-B, emarginatoside-C, carrageenan, histamine, serotonin, zymosan, type II cyanolipids, fatty acid, oleic acid, arachidic acid, 11-iecosenoic acid, cisvaccenic acid, and 13-eicosenoic acid. Phenolic acids and the related enzymes as polyphenol oxidase and peroxidase were also identified and estimated in the pericarp, mesocarp, endocarp and endosperm of ripened and dried seeds of Sapindus trifoliatus. Phenolic acids such as proto catechuic acid, cis -p- coumaric acid, p-hydrobenzoic acid and cinnamic acid are present in all parts of S. trifoliatus seeds (1). A Sapindus trifoliatus seed also contains hederagenin, arachidic, behenic, linoleic, oleic, palmitic, stearic and oleanolic acid, sapindic acid, trifolioside A sapindiside C, D, E glucopyranosides of stigmasterol, kaempferol, quercetin, B-sitosterol, fatty acid, eicisenoic acid, protein, carbohydrate, and starch. Saponin from pericarp of nuts yielded the genins, methylhedragenate, sapindic acid and methyl oleanolate.