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| Nutritional Composition Analysis and Evaluation of Eggs in American Shad Alosa sapidissima |
| SHI Yonghai, XU Jiabo, XIE Yongde, LIU Yongshi, SHUI Chun, LU Genhai, ZHANG Genyu, JIANG Fei |
| Shanghai Fisheries Research Institute, Shanghai Fisheries Technical Extension Station, Shanghai 200433, China |
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Abstract Nutritional composition and quality of eggs were analyzed and evaluated in American shad Alosa sapidissima by biochemical analysis methods in order to understand the nutritive value of the eggs. The results showed that there were moisture of 91.88%, crude protein of 5.33%, crude fat of 1.14%, and ash of 0.76% in the fresh eggs, with the top contents of lutamic acid, leucine, alanine, and aspartic acid in 18 kinds of amino acids found in the eggs. The eggs contained total amino acid (TAA) of 61.41%, total essential amino acid (EAA) of 27.05%, total non-essential amino acid (NEAA) of 30.54%, and total delicious amino acid (DAA) of 21.12%, with EAA/TAA=0.44, EAA/NEAA=0.89, and DAA/TAA=0.34. The amino acids score (AAS) and chemical score(CS) revealed that the first limited amino acid was Met+Cys,the second limited amino acid was Try, with the essential amino acid index (EAAI) of 3.17, and the ratio of branched chain amino acid to aromatic amino acid (F value) of 86.98. Three saturated fatty acids (∑SFA =30.43%),two mono-unsaturated fatty acids (∑MUFA=28.45%),and eight poly-unsaturated fatty acids (∑PUFA=41.04%) were found in the dry eggs, with the ∑SFA/∑UFA=0.44 and ∑n-3PUFA/∑n-6PUFA=0.51. The fatty acids in eggs were primarily comprised of C18:1n9c (27.13%), C16:0 (22.39%), C18:2n6c (14.56%), and C22:6n3 (DHA)(11.29%), accounting for 75.37% of the total fatty acids. Therefore, the egg dry matter of American shad has high nutritional value and delicious, although it has the high moisture.
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Received: 21 December 2018
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