| In order to compare and evaluate the higher-order nutrients (compositions of amino acid and fatty acid) of different walnut species in China,the compositions of amino acid and fatty acid of four nuts of Juglandaceae (Juglans regia Linn., Juglans sigillata Dode,Carya cathayensis Sarg., and Carya illinoensis (Wangenh.) K. Koch)from Zhejiang, Anhui, Gansu, Shaanxi, Sichuan and Xinjiang were analyzed according to the national standard method,and the nutritional evaluation of amino acid and fatty acid components were carried out by using essential amino acid index, matching degree and balance degree of amino acid, amino acid ratio coefficient method and fatty acid index evaluation method. The results showed that the total amino acids contents of Juglans sigillata Dode and Juglans regia Linn.were higher than the other two nuts. The content of essential amino acids in the four nuts accounted for about 1/3 of the total amino acid content. There was a positive correlation between total amino acids content and essential amino acids content. The contents of aspartic acid,glutamic acid and argininein of non-essential amino acids were higher. Juglans sigillata Dode from Aksu，Xinjiang was the best in the evaluation results of essential amino acid index and amino acid matching degree, and the amino acid balance degrees of the four nuts were similar. The amino acid ratio coefficient method showed that the Carya cathayensis Sarg. from Linan, Zhejiang was the best, followed by Juglans sigillata Dode from Aksu, Xinjiang. Carya cathayensis Sarg.and Carya illinoensis (Wangenh.) K. Koch had higher oleic acid content, while Juglans sigillata Dode and Juglans regia Linn. had higher linoleic acid content. The results provided some basic data for the breeding, production and processing of Juglandaceae nuts. |
