This present study was conducted to compare the moisture, crude protein, crude lipid, ash, minerals, amino acids and fatty acids in abdominal foot muscles of different sizes of Hemifusus tuba (50, 100, 200, 300 and 400 g). The results showed that the contents of crude protein, crude lipid and moisture of Hemifusus tuba were significantly affected by the different sizes (P＜0.05), but the ash content showed no significant difference (P＞0.05). The highest values of crude protein (70.00%) and lipid contents (5.63%) were found in the 400 g group while the least values of crude protein (56.21%) and lipid contents (2.17%) were observed in 50 g group, respectively. The mineral analysis results showed that potassium (K) content was the highest among major elements, and iron (Fe) content was the highest among trace elements. The 300 g group had significantly higher mineral contents than the other groups (P＜0.05). The amino acid analysis results showed that the contents of glutamic acid, glycine, aspartic acid and arginine had higher values than the other amino acids, while the cystine content was the least in all amino acids. Total amino acid (TAA) and essential amino acids (EAA) in muscles in 300 g group had higher values (186.91 and 80.71 mg/g). Flavor amino acids (FAA) in 200 g size group had higher value (82.70 mg/g). The fatty acid analysis results showed that the amount of unsaturated fatty acids (UFA) was 63.50% to 66.13%. The contents of C20:5(EPA) and C22:6(DHA) values were 5.38% to 6.21% and 15.03% to 16.06%, respectively.
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