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| Investigation of the contents of fat and fatty acids in Juglans sigillata cv. Yangbidapao based on a large sample size |
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| KeyWord:walnut fat fatty acid oleic acid α-linolenic acid sample size |
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| Abstract: |
| In order to evaluate the grades of Yangbidapao walnut and walnut oil，the fat and fatty acid contents in 91 Yangbidapao walnut samples from Yangbi county were analyzed according to GB 5009.6-2016 and GB 5009.168-2016, respectively, and their grades were determined by GB/T 20398-2006 and T/CCOA 2-2019. The results showed that the mean content of fat in 91 samples was 65.3%, and the coefficient of variation was 3.1%. Five fatty acids (linoleic acid, oleic acid, α-linolenic acid, palmitic acid and stearic acid) were detected in all 91 samples. The mean contents (content ranges) of these five fatty acids were 61.4%(38.7%-70.0%), 22.5%(11.1%-49.4%), 7.7%(3.9%-11.4%), 6.4%(4.3%-8.2%), 2.0%(1.5%-3.6%), respectively. The mean content of unsaturated fatty acids was up to 91.6%, and that of essential fatty acid was up to 69.1%. The coefficients of variation for oleic acid and α-linolenic acid were up to 30.1% and 20.4%, respectively. According to fat content, 63.7% of all samples conformed to the special grade and 1st grade of walnut, and 91.2% of all samples conformed to the special grade of walnut oil according to the contents of fatty acids. The maximum contents and coefficients of variation for oleic acid and α-linolenic acid suggest the possibility of selecting plants with high content of oleic acid or α-linolenic acid in Yangbidapao walnut. Additionally, a large sample size is probably necessary for the thorough investigation of the content differences of fat and fatty acids within or among walnut cultivars in Yunnan province. |
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