摘要
【目的】对新疆额尔齐斯河5种达到商品鱼规格的土著鱼:北极茴(Thymallus arcticus)、江鳕(Lota lota)、丁鲑(Tinca tinca)、白斑狗鱼((Esox lucius)、河鲈(Perca fluviatilis)的肌肉18种氨基酸含量进行了测定,并对其营养价值进行评估。【方法】酸水解法与碱水解法。【结果】5种鱼氨基酸总量介于82.65%~59.37%间,其中北极茴鱼含量显著低于其他种;8种必需氨基酸质量分数为53.52%~39.95%,除丁鲑和白斑狗鱼外,其他种间差异显著;鲜味氨基酸含量在34.99%~26.37%,北极茴和丁鲑含量显著低于其他种。与WHO/FAO模式谱相比较,5种鱼的必需氨基酸含量符合度好,氨基酸比值系数分为93.27%~83.33%。【结论】5种野生土著鱼氨基酸含量丰富,必需氨基酸比例平衡,鲜味氨基酸比值高。以氨基酸比值系数分为参比来看,在满足商品鱼规格时,5种鱼营养价值顺序为丁鲑>白斑狗鱼>河鲈>北极茴>江鳕。
【Objective】To determine the contents of 18 kinds of amino acids in muscle of Tinca tinca,Esox lucius,Perca fluviatilis,Thymallus arcticus and Lota lota living in the Irtysh River and evaluate the nutritional quality.【Method】Using acid hydrolysis and alkaline hydrolysis.【Result】Their total amino acids composition vary from 82. 65% to 59. 37,of which Thymallus arcticus was lower than the others signally; Mass fraction of essential amino acids varied from 53. 52% to 39. 95%,except Tinca tinca and Esox lucius,the other three species showed a remarkable difference; Delicious amino acids composition varied from 34. 99% to26. 37%,of which Thymallus arcticus and Tinca tinca were lower than the others notably. Compared with the ideal pattern of WHO/FAO,they showed a fine fitness of the essential amino acids composition in the five fishes. RC of the five fishes was 93. 27%- 83. 33%.【Conclusion】These five kinds of fish contain rich amino acids and a balanced essential amino acids proportion,and they also have a high proportion of delicious amino acids. The nutritional value order of the five kinds of fish is: Tinca tinca > Esox lucius > Erca fluviatilis > Thymallus arcticus > Lota lota evaluated by the ratio of amino acid to the reference point and in the meanwhile they reach the specification of commercial fish.
引文
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