斑石鲷肌肉营养成分分析

Analysis of muscle nutrition composition and the nutrition evaluation of Oplegnathus punctatus

为评价斑石鲷的营养价值,对斑石鲷的含肉率进行了测定,并采用国家标准方法测定了斑石鲷肌肉中的水分、粗蛋白质、粗脂肪、粗灰分、氨基酸、脂肪酸和矿物质元素含量。结果表明,斑石鲷的含肉率为56.1%;肌肉中水分、粗蛋白、粗脂肪和粗灰分的含量分别为78.26%、13.9%、1.48%和1.34%;肌肉中含19种氨基酸,总含量(鲜重)为21.28%,其中必需氨基酸含量为8.83%,占氨基酸总量的39.17%;必需氨基酸与非必需氨基酸含量的比值为64.32%;鲜味氨基酸含量为7.78%,占氨基酸总量的36.58%;肌肉中多不饱和脂肪酸百分比含量为35.24%,DHA和EPA含量分别为12.4%和3.74%;肌肉中矿物质元素Ca,Mg和P的含量分别为720、1510μg/g和9930μg/g,微量元素中锌的含量最高(15μg/g),其次为铁(4.9μg/g)。斑石鲷肌肉中富含必需氨基酸和鲜味氨基酸,且DHA和EPA及矿物质元素含量丰富,因此斑石鲷是营养价值较高的优质食用鱼类。

In order to evaluate the nutritive value of Oplegnathus punctatus,biochemical composition,amino acids composition,fatty acid composition and mineral composition in the muscle of O.punctatus were determined with routine methods.The results showed that the contents of moisture,crude protein,crude fat and crude ash of muscles were 78.26%,13.9%,1.48% and 1.34%,respectively.The amino acid composition of muscle contained 19 common amino acids,including 8 essential amino acids for human needs.The total amount amino acids were21.28%（ wet weight）.The essential amino acids were 8.33%,accounting for 39.17% of total amino acids,the ratio of essential amino acids to non- essential amino acids was 64.32%,the content of delicious amino acids was 7.78%,accounting for 36.58% of total amino acids.The total percentage of poly- unsaturated fatty acids was 35.24% in muscle,the EPA and DHA contents were 3.74% and 12.4%,respectively.The contents of calcium,phosphorus,magnesium in muscle were 720,9930 μg / g and 1510 μg / g,respectively.The dominant trace mineral content in the muscle of O.punctatus was Znic（ 15 μg / g）,iron was the second（ 4.9 μg / g）.The results indicated that the O.punctatus possessed high nutrition value and health effect and could be an important species for aquaculture in the future.