Analysis on the Difference of Nutrient Composition in Muscle of Schizothorax wangchiachii with Different Sizes
[Objective]The aim of this study was to explore the difference of nutritional value of Schizothorax wangchiachii(S.wangchiachii)with different sizes.[Method]Three S.wangchiachii of large size(425.27 g±14.99 g)and 15 S.wangchiachii of small size(72.63 g± 11.31 g)were selected.The back muscles(Among them,S.wangchiachii of small size randomly mixed into one sample every 5)were taken to measure moisture content,crude ash content,crude protein,and crude fat content.The composition and content of amino acids were determined by automatic amino acid analyzer,and the composition and content of fatty acids were determined by gas chromatograph.Essential amino acid nutrition was evaluated by amino acid score(AAS),chemical score(CS)and essential amino acid index(EAAI).[Result]There were no significant differences in moisture and crude ash contents in muscle in S.wangchiachii of different sizes(P＞0.05),and the contents of crude protein,crude fat,total amino acid content(∑TAA),total essential amino acid content(∑EAA),and total fresh amino acid content(∑DAA)in the muscle of the fish in large size group were significantly lower than those of small size group(P＜0.05).The values of ∑EAA/∑TAA in fish muscle protein of two different sizes were 0.41 and 0.42,respectively,both greater than 0.4.The values of ∑EAA/total non essential amino acids(∑NEAA)were 0.71 and 0.72,respectively,both greater than 0.6.Methionine+cystine was the first limiting amino acid in muscle of two different sizes of S.wangchiachii,followed by valine.The contents of saturated fatty acids and monounsaturated fatty acids in small size group were significantly lower than those in large size group(P＜0.05),but the contents of polyunsaturated fatty acids,EPA+DHA,ω-3,ω-6 fatty acids in small size group were significantly higher than those in large size group(P＜0.05).[Conclusion]From the contents of crude protein and crude fat,nutritional evaluation of essential amino acids and nutritional value of fatty acids,small size S.wangchiachii had higher nutritional value than those of large size fish.
万方数据
维普
