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). However, the results of ORAC, ABTS and DPPH methods showed no significant difference between the two groups (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.

中文翻译：

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花生皮原花青素的组成及抗氧化研究

花生皮富含原花青素（PC），并具有生物活性。据报道，从花生皮和葡萄籽获得的PC之间存在差异。该研究的目的是评估从花生皮中获得的PC与从天然葡萄籽中获得的PC的化学结构和抗氧化能力。葡萄籽中的PC作为PC标准品，用于评估花生皮中的PC。发现PC标准品的含量高于花生皮。花生皮中的PC主要由具有儿茶素和表儿茶素单体单元的A型PC组成。PC标准主要由B型PC组成，其单体单元为表儿茶素，表儿茶素没食子酸酯和儿茶素。此外，花生皮的FRAP结果低于PC标准（p <0.05）。但是，ORAC，ABTS和DPPH方法的结果显示两组之间没有显着差异（p  > 0.05），这与细胞抗氧化活性的结果一致。这些研究支持花生皮可以用作PC的潜在丰富且廉价的来源，而PC可以很好地替代葡萄籽。