澳洲金鲈鱼种肌肉中氨基酸与脂肪酸组成的分析

目的研究澳洲金鲈肌肉中营养成分组成。方法采用色谱法和常规分析化学法检测出澳洲金鲈鱼种肌肉中蛋白质、脂肪、氨基酸和脂肪酸等含量,并对肌肉中氨基酸与脂肪酸组成进行分析和评价。结果澳洲金鲈鱼种肌肉中含有17种氨基酸(未测色氨酸),在必需氨基酸中含量最高的是赖氨酸,含量最低的是蛋氨酸,必需氨基酸占氨基酸总量的39.67%;第一限制性氨基酸是蛋氨酸和胱氨酸;氨基酸比值系数分为78.55%;必需氨基酸指数为89.64%;澳洲金鲈的蛋白质营养符合E/T应为40%左右和E/NT应为60%以上的参考蛋白质模式标准。澳洲金鲈含有22种脂肪酸,含量最高的是油酸,亚油酸次之;不饱和脂肪总量为64.4%。结论澳洲金鲈具有营养价值高、味道鲜美等特点,可以作为我国优良品种引进及产业化开发的淡水鱼。

Analysis on the amino acids and fatty acids compositions in muscle of juvenile Australian golden perch

Objective In order to study the nutrient composition in the muscle of Australian golden perch. Methods In this study, the contents of protein, fat, amino acid and fatty acid in the muscle of juvenile golden perch were detected by chromatography and conventional analytical chemistry, and the composition of amino acid and fatty acid in the muscle was analyzed and evaluated. Results The juvenile golden perch muscle contained 17 amino acids (undetected tryptophan), The first limiting amino acids are methionine and cystine. The amino acid ratio coefficient SRCAA score was 78.55%. The essential amino acid index EAAI was 89.64%. The protein nutrition of juvenile golden perch conforms to the WHO/FAO suggested that E/T should be about 40% and E/NT should be more than 60% of the reference protein model standard. The juvenile golden perch contains 22 kinds of fatty acids, the highest content is oleic acid, linoleic acid followed; The total amount of unsaturated fat was 64.4%. The ratio of sigma (n-6) PUFA/sigma (n-3) PUFA is 4, which is onsistent with the ratio 4 to 5 of a reasonable dietary structure to the United Nations health organization. The ratio of sigma PUFA to sigma SFA was 1.1, higher than the minimum recommended by the world health organization of 0.4 ~ 0.5.Conclusion The golden perch has the characteristics of high nutritional value, delicious taste and so on, and can be used as the freshwater fish for the introduction and industrial development of excellent species in China.