In order to investigate the fresh-keeping effect of the astaxanthin-carboxymethyl chitosan composite coating liquid on giant freshwater prawn, carboxymethyl chitosan and laboratory self-made astaxanthin used as the main raw materials in this study for the preparation of different concentrations (30, 60, 90 mg/L) astaxanthin-carboxymethyl chitosan composite coating liquid, coating treatment on giant freshwater prawn. The carboxymethyl chitosan group without astaxanthin were treated as the control and uncoated group as the blank. The samples were stored at (4±1) ℃ and the total viable count (TVC), pH, Thiobarbituric acid reactive substance (TBARS), total volatile base nitrogen (TVB-N) value, K value and, the sensory score of giant freshwater prawn were analyzed during preservation process. The results showed that: compared with the blank group, different concentrations of astaxanthin-carboxymethyl chitosan composite film preservation group can effectively restrain the spoilage of giant freshwater prawn during the storage. Among them, the 60 and 90 mg/L composite fresh-keeping liquid groups had good fresh-keeping effects. Compared with the control group, the TVB-N value, K value, TVC, pH, TBARS, and the sensory score showed significant changes after 7 days of refrigeration. Therefore, the astaxanthin-carboxymethyl chitosan composite coating film is a safe, effective and feasible method to keep giant freshwater prawn fresh. This could restrain the deterioration of sensory quality of giant freshwater prawn and lipid oxidation, which is beneficial to extend the shelf life of giant freshwater prawn by 3 to 4 days during refrigeration.
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