Analysis of Appearance Characters and Nutritional Quality of Different Varieties of Walnut in Xinjiang and Yunnan
[Objective]To analyze the appearance characters and nutritional quality of walnuts in different origins of Xinjiang and Yunnan(13 batches from Xinjiang,2 batches from Yunnan).[Method]The variation of 8 external quality indexes and 26 internal quality indexes of 15 bat-ches and 6 varieties of walnuts from Xinjiang and Yunnan were studied by conventional observation,Soxhlet extraction,gas chromatography,Kjeldahl nitrogen determination and ICP-MS method.[Result]The longitudinal diameter,mean value of three diameters(longitudinal diame-ter,transverse diameter,edge diameter)and fruit shape index of walnut from different regions had little difference,and the transverse diameter of walnut from Xinjiang was generally larger.The output rate of 13 batches of walnuts in Xinjiang(52.24%-64.33%)was significantly higher than that of 2 batches in Yunnan(46.22%and 47.68%,respectively).The coefficient of variation for palmitoleic acid and α-linolenic acid in 15 batches of walnut nuts were 52.06%and 16.04%,respectively,with significant differences.The protein content of walnut kernels varied sig-nificantly in different regions,with a coefficient of variation of 8.78%;the coefficient of variation of trace elements in walnut kernels was rela-tively large among different regions(9.39%-66.69%),the difference is obvious.The heavy metal mercury was not detected in the 15 batches of walnut nut samples,arsenic,cadmium and chromium were detected,the lead content detection ranged between 0.021-0.032 mg/kg,howev-er,it did not exceed the limit requirements of GB 2762-2022 National Standard for Contamination in Food.[Conclusion]This study provides scientific basis for the development and utilization of walnut resources.
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