| Physicochemical property of six kinds of walnut kernels from different origins（Yunnan,Xinjiang,Shaanxi,Gansu,Shanxi and Hebei）and physicochemical property, fatty acid composition and oxidative stability of the six kinds of walnut oils were determined and the variance analysis and mutation analysis were carried out. Meanwhile, the oxidative stability indexes (OSI) of six kinds of walnut oils were assessed by Rancimat method and the correlation between fatty acid composition and oxidative stability index of walnut oil was studied by regression analysis. The results showed that the difference in moisture content of physicochemical property of the six kinds of walnut kernels was the greatest, followed by protein content and fat content; the difference in peroxide value of physicochemical property of the six kinds of walnut oils was the most, followed by acid value, saponification value, iodine value, relative density and refractive index; the difference in linolenic acid of fatty acid content of the six kinds of walnut oils was the most, followed by oleic acid, stearic acid, palmitic acid and linoleic acid; the influence of linoleic acid on the oxidative stability of walnut oil was the largest, followed by stearic acid, palmitic acid, oleic acid and linolenic acid. |
