摘要:
对新疆阿克陶县玉麦乡引种栽植的5个果桑品种的成熟桑葚的氨基酸含量进行了检测,分析了不同品种间的氨基酸组成、总氨基酸、必需氨基酸、鲜味氨基酸、药用氨基酸及支链氨基酸含量的差异,采用RAA、RC、SRC等氨基酸评价指标进行了营养评价。结果表明:5个果桑品种的成熟桑葚中均含有16种氨基酸,总含量为0.802~1.323 g/100 g,其中谷氨酸含量最高,色氨酸和蛋氨酸含量最低,不同品种之间EAA/TAA差异不显著(P>0.05);8632的总氨基酸、必需氨基酸、鲜味氨基酸、药用氨基酸和支链氨基酸的含量均显著高于其它品种,红果2号次之;与FAO/WHO氨基酸模式谱比较得出,除蛋氨酸+胱氨酸之外,其它必需氨基酸接近或符合FAO/WHO氨基酸模式要求;氨基酸比值系数法评定可知第一限制氨基酸为蛋氨酸+胱氨酸,不同品种的SRC评分依次为红果2号>8632>台果>大10>果选2号,红果2号和8632的SRC分别为84.863和82.859。说明5个果桑品种中8632和红果2号的氨基酸营养价值高,作为新疆地区推广的果桑品种具有明显的优势。
关键词:
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阿克陶
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果桑
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桑葚
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氨基酸
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营养评价
Abstract:
The content of amino acids was detected in 5 fruit mulberry varieties coming from Yu mai County in Xinjiang,Aktao. The amino acids composition,total amino acids,essential amino acids,amino acids with flavor enhancement effect,amino acids with medicinal function and branched-chain amino acids among different varieties were compared and amino acid evaluation index(RAA,RC and SRC)was adopted to make comprehensive nutritional evaluation.The results showed that 16 kinds of amino acid were detected in 5 mature mulberry,with the total content ranging from 0.802 to 1.323 g/100 g and with the highest content of glutamate and the lowest content of tryptophan and methionine. There was no significant difference in EAA/TAA among different varieties(P>0.05).The content of total amino acids,essential amino acids,amino acids with flavor enhancement effect,amino acids with medicinal function and Branched-chain amino acids of 8632 were significantly higher than those of other varieties,followed by Hongguo no.2. The essential amino acids were conformed to or close to FAO/WHO amino acid model,except methionine+cystine. Methionine+cystine were the first limiting amino acid in mulberry fruit by amino acid ratio coefficient method. The SRC score order of different varieties was Hongguo no.2> 8632>Taiguo> Da 10>Guoxuan no.2,and SRC scores of Hongguo no.2 and 8632 were 84.563 and 82.859 respectively,which higher than those of other varieties. The results showed that the amino acid nutritional value of 8632 and Hongguo no.2 was higher among the five fruit mulberry varieties,which had obvious advantages as the fruit mulberry varieties popularized in Xinjiang.
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