| In order to explore the quality differences among the main varieties of Carya illinoinensis introduced in Yunnan, and lay a theoretical foundation for their further processing and variety breeding, 9 representative varieties of Carya illinoinensis were selected, and the contents of crude protein, crude fat, vitamin E, microelements and fatty acid composition of the kernel were determined, and correlation analysis on various indicators was conducted. The results showed that the crude protein content of 9 varieties of Carya illinoinensis was 4.37-7.96 g/100 g, with an average value of 5.88 g/100 g; the crude fat content was 53.21%-74.91%, with an average value of 65.90%; the content of vitamin E was 089-1.22 mg/g, with an average value of 1.04 mg/g. The average values of Zn, Fe and Ca contents were 0.068, 0.118 mg/g and 0.514 mg/g, respectively; the average value of Pb content was 0.115 μg/g, lower than the national standard limit value. The fatty acids composition of 9 varieties of Carya illinoinensis was basically the same, and the order of their contents was oleic acid, linoleic acid, palmitic acid, stearic acid, linolenic acid, etc. Correlation analysis showed that there was varying degrees of positive or negative correlation between various indicators. Different varieties of Carya illinoinensis have their own emphasis on basic nutritional composition，fatty acid composition, and microelements content. In the process of deep processing of Carya illinoinensis, targeted selection of different varieties is required based on the finished product, ingredients, processing technology, etc. In terms of variety cultivation, targeted cultivation can also be carried out based on the characteristics of each variety. |
