Different walnut oil physical and chemical properties analysis and fatty acid gas chromatography analysis before and after storage

To make better use of domestic and foreign walnut resources,seven kinds of walnut oil of palmitic acid,stearic acid,oleic acid,linoleic acid and linolenic acid content was analyzed by capillary gas chromatography before and after the storage. And it was measured the seven kinds of walnut oil acid value and peroxide value.The results showed that the content of unsaturated fatty acids in walnut at about 90%. Significant difference was found in some walnut varieties each fatty acid content(p <0.05). The fatty acid content changed after storage,different varieties of walnut fatty changed differently. The acid value increased slowly first,then increased rapidly. The peroxide value increased first and then decreased. Different varieties of walnut acid value and peroxide value changes had differences,but the trend was the same. Walnut oil acid value,peroxide value and the unsaturated fatty acids had a certain correlation.