ความสามารถในการต้านออกซิเดชันและปริมาณสารฟีโนลิครวมของเยื่อหุ้มเมล็ดถั่วลิสง

Abstract

Peanut testae or peanut skins are normally discarded as a by-product of peanut processing. Peanut testae contain some beneficial phytochemicals that can show the antioxidant effect in vitro and in food. Therefore, the aim of this study was to determine the antioxidant capacity of the peanut testae of 9 peanut varieties. The average amount of peanut testa was 3.62 ± 0.80 % of whole seed. The average moisture content of peanut testae was 11.00 ± 0.90 %. The methanol extracts of peanut testae exhibited the ability to scavenge both DPPH radical and hydroxyl radical in vitro . The total phenolic contents of peanut testae were 6,267.70 – 10,292.08 mg GAE/100 g, with an average of 8,554.97 ± 1,264.80 mg GAE/100 g. The total phenolics of peanut testae exhibited a negative correlation with IC50 values of peanut testa methanol extracts obtained from both DPPH assay and deoxyribose assay, by giving the correlation coefficient (r) values of -0.69 and -0.64, respectively. This implied the positive relationship between total phenolics and antioxidant capacity of peanut testae. Keywords: peanut testa, antioxidant capacity, total phenolics