Oleanane saponins in "kancolla", a sweet variety of Chenopodium quinoa

Abstract

Seven triterpenoid saponins were isolated from the seeds of "kancolla", a sweet variety of Chenopodium quinoa. Their structures were phytolaccagenic acid 3-O-[α-L-arabinopyranosyl-(1″→3′)-β -D-glucuronopy-ranosyl]-28-O-β-D-glucopyranoside, oleanolic acid 3-O-[β-D-glucopyranosyl-(1″→3′)-α -L-arabinopyranosyl]-28-O-β-D-glucopyranoside, hederagenin 3-O-[α-D-glucopyranosyl-(1″→3′)-α -L-arabinopyranosyl]-28-O-β-D-glucopyranoside, phytolaccagenic acid 3-O-[β-D-glucopyranosyl-(1″→3′)-a-L -arabinopyranosyl]-28-O-β D-glucopyranoside, oleanolic acid 3-O-[β-D-glucuronopyranosyl]-28-O-β-D-glucopyranoside, oleanolic acid 3-O-[α-L-arabinopyranosyl-(1″→3′)-β -D-glucuronopyranosyl]-28-O-β-D-glucopyranoside, and the new compound serjanic acid 3-O-[β-D-glucopyranosyl-(1″→-3′)-α-L -arabinopyranosyl]-28-O-β-D-glucopyranoside (1). The structure of 1 was characterized on the basis of spectroscopic and chemical evidence.