Amir Jalili, Shahriar Alipour , Asra Sadegzadeh
Persian walnut show genetic diversity and have a large distribution. Different species of these walnuts have more variation in genes resistant to dryness, diseases, pests, and other factors. In order to compare the antioxidant and antiradical activity of Persian walnut hull and shell phenolic extracts, 3 species (J. duclouxiana Dode, J. fallax Dode, J. orientis Dode) were selected from Barandoz,Khaletabad and Jamalabad, West Azerbaijan province, Iran, in 2010. The fruits of these walnuts were collected, their hulls and shells were dried and then ground, and then methanolic extracts were prepared from these hulls and shells. Total phenolic content was determined using the FolinÃ?¢Ã?â?¬Ã?â??Ciocalteu (FÃ?¢Ã?â?¬Ã?â??C) method. The extractsÃ?¢Ã?â?¬Ã?â?¢ reducing power and scavenging capacity for radical nitrite, hydrogen peroxide, and superoxide were evaluated. The results show that the antioxidant and antiradical activities of the walnut hull are higher than those of its shell phenolic extract among different species of walnut. In addition, the reducing power of walnut hull and shell phenolic extract was positively correlated with the phenolic content and radical scavenging capacities of walnut hull and shell extracts in different species were positively correlated with phenolic content and reducing power.
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