Planta Med. 2001 Jun; 67(4): 345-9.

Alkaloids and flavonoids from peanut skins.

Lou H, Yuan H, Yamazaki Y, Sasaki T, Oka S.

School of Pharmaceutical Sciences, Shandong University, Jinan, P. R. China. hxlou@jn-public.sd.cninfo.net

Separation of the water-soluble fraction of peanut skins led to the isolation of 8 flavonoids and two novel indole alkaloids. Two new flavonoid glycosides have been identified as isorhamnetin 3-O-[2-O-beta-glucopyranosyl-6-O-alpha-rhamnopyranosyl]- beta-glucopyranoside and 3',5,7-trihydroxyisoflavone-4'-methoxy-3'-O-beta-glucopyranoside. Two alkaloids are 2-methoxyl-3-(3-indolyl)-propionic acid and 2-hydroxyl-3-[3-(1-N-methyl)-indolyl]-propionic acid. These isolated flavonoids were evaluated for their free radical scavenging activity and protein glycation inhibitory effects.