Comparison of nutritional composition, physicochemical and antioxidant properties of muscle, liver, and shell from Grass Turtle (Chinemys reevesii)

Nutritional composition, functional and antioxidant properties of different parts from grass turtle were investigated. Muscle contained high protein, essential amino acids, and vitamin B6, which were 74.97%, 28363.84, and 14.47 mg/100 g, respectively. Unsaturated fatty acids, vitamin K were significantly higher in the liver which reached 7489.45 and 1591.67 mg/100 g, respectively. Hardshell high content of minerals and vitamin B3 (48998.06 and 17.52 mg/100 g), correspondingly. The molecular weight was obtained in the range of 0.27–87.38% (Mw˂1000 Da). Solubility, emulsifying activity, and emulsion stability index at different pH ranged from 3.89 to 45.89%, 47.53 to 90.22 m2/g, and 65.45 to 89.93%, respectively. Water and oil holding capacities were high in muscle (7.97 and 2.19 mL/g). The highest antioxidant activity was observed in the muscle (88.58% ABTS) and liver (66.71% DPPH and 0.49 FRAP). Muscle, liver, and hard shell properties will provide producers and consumers with useful new information about the nutritional value and health benefits.