| Three varieties of black sesame and three varieties of white sesame were selected to study the contents of total phenolics, lignans and antioxidant activity of seed, kernel and seed coat, and the correlation between total phenolics, lignans and antioxidant activity. The results showed that the total phenolics contents in black sesame seed, kernel and seed coat were higher than those in white sesame seed, kernel and seed coat. The lignans contents in sesame seed, kernel and seed coat of black sesame and white sesame varieties changed little, and the contents of sesamin and sesamolin were lower (<40 mg/100 g). The total antioxidant capacity of black sesame seed and seed coat were higher than those of white sesame seed and seed coat, while the total antioxidant capacity of black sesame kernel and white sesame kernel had little difference. The DPPH free radical scavenging rates of seed coats of black sesame and white sesame were much higher than those of sesame seed and kernel, and the hydroxyl free radical scavenging abilities of sesame seed and kernel of black sesame and white sesame were very weak, but the hydroxyl free radical scavenging rate of sesame seed coat was above 60%. Total phenolics contents and total antioxidant capacities of seed and seed coat of black sesame and white sesame were extremely, significantly and positively correlated (P＜0.01), and the total phenolics contents of seed and seed coat were extremely and significantly (P＜0.01) or significantly(P＜0.05)positively correlated with DPPH free radical scavenging rate. |
