Composition and antioxidant study of procyanidins from peanut skins

Abstract

Peanut skins are rich in procyanidins (PCs) and are shown to have bioactivity properties. It was reported that there were differences between PCs obtained from peanut skins and grape seeds. The aim of the research was to evaluate the chemical structure and antioxidant capacity of PCs gained from peanut skins compared with those from natural grape seeds. PCs from grape seeds were used as PC standard to evaluate those from peanut skins. It was found that the content of PC standard was higher than peanut skins. PCs from peanut skins were mainly composed of A-type PCs with monomeric units of catechin and epicatechin. PC standard was mainly composed of B-type PCs whose monomeric units were epicatechin, epicatechin gallate and catechin. Additionally, the result of FRAP from peanut skins was lower than PC standard (p 0.05), which was consistent with results of cell antioxidant activity. These researches support that peanut skins can be utilized as a potentially abundant and cheap source of PCs which can be great substitutes of grape seeds.