Dehydrosoyasaponin I was identified as a minor componentwith antifeedant and insecticidal properties in extracts from yellow field peas (Piswn sativum L.). Chromatographic fractionation of crude methanolic extracts (C8 extracts) from commercial protein-rich pea flour yielded fractions containing soyasaponins and phospholipids in addition to other fractions containing the insecticidal pea albumin lb family of cysteine- rich plant peptides. Activity of the saponin fractions was determined by a flour disk bioassay with the rice weevil [Sitophilus oryzae (L.)], an insect pest of stored products. Synergists of dehydrosoyasaponin I were also present in C8 extracts, in the form of three phospholipids of the lysolecithin (lyso-phosphatidylcholine) type.
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