Alkaloids and flavonoids from peanut skins

Separation of the water-soluble fraction of peanut skins led to the isolati on of 8 flavonoids and two novel indole alkaloids. Two new flavonoid glycos ides have been identified as isorhamnetin 3-O-[2-O-beta -glucopyranosyl-6-O -alpha -rhamnopyrano-syl]-pi beta -glucopyranoside and 3'5,7-trihydroxyisof lavone-4'-methoxy-3'-O-beta -glucopyranoside. Two alkaloids are 2-methoxyl- 3-(3-indolyl)-propionic acid and 2-hydroxyl-3-[3-(l -N-methyl)-indolyl]-pro pionic acid. These isolated flavonoids were evaluated for their free radica l scavenging activity and protein glycation inhibitory effects.