Fatty acid content and nutritional evaluation of Yunnan purple kernel walnut

Comparing with Yunnan sigillate walnut,the fatty acid compositions of twenty-eight purple kernel walnuts samples were analysed.The results showed that the contents of palmitic acid,palmitoleic acid,stearic acid,oleic acid,linoleic acid,linolenic acid,arachidic acid and arachidonic acid were3.70%-7.68%,0.02%-0.48%,0-2.80%,15.80%-43.16%,44.67%-67.80%,4.10%-10.40%,0-0.29% and 0-0.22%,respectively.The analysis results of variation,correlation and principal component of the fatty acid content showed that the greatest variation was arachidic acid,and the less variations were palmitic acid and linoleic acid; oleic acid had great negative correlation with linoleic acid and linolenic acid; the accumulative contribution of the first three principal components reached 75.028%,which almost included the main information of all the eight fatty acids contents; the fuzzy comprehensive evaluation on fatty acid contents and nutritional characteristics of purple kernel walnut was carried out,and the fatty acid contents and nutritional values of twenty-seven purple kernel walnuts samples were higher than those of sigillate walnut.