Impact of chitosan-based coatings on myofibrillar protein denaturation, muscle microstructure and lipid oxidation of oyster (Crassostrea hongkongensis) during 0 °C storage

ABSTRACT

The changes in myofibrillar protein, muscle microstructure, and lipid oxidation of oysters (Crassostrea hongkongensis) treated with chitosan-based coatings (CP-0°C) or aseptic water (CG-0°C) for 20 days storage at 0°C were investigated. Compared to the CG-0°C at day 20, the higher total sulfhydryl group content (83.24%), unfrozen water content (39.24%), and Ca²⁺-ATPase activity (96.79%) along with the lower myofibrillar protein solubility (80.15%) indicated that CP-0°C protected oysters from protein denaturation. Similarly, the CP-0°C better maintained muscle microstructure shown by the relatively higher quality of muscle and less ice crystals. Meanwhile, CP-0°C prevented lipid hydrolysis and oxidation, as evidenced by the lower contents of fatty acid (FA) content (total content of 12.16 ± 1.02 mg/g wet weight at day 20), peroxide value (POV) (15.13 meq oxygen/Kg lipid at day 20), and thiobarbituric acid-reactive substances (TBARS) (1.79 mg MDA eq/Kg sample at day 20) in CP-0°C. These results imply that CP-0°C could protect the quality of chilled oysters stored at 0°C.

KEYWORDS:

• Oysters (Crassostrea hongkongensis)
• lipid
• myofibrillar protein
• 0°C storage
• muscle microstructure

Acknowledgments

The Key R & D Projects of Guangxi Science and Technology Research, China (2018AB45010), and Scientific and Technological Innovation Major Base of Guangxi (AA17204095−4) and (AA17204088−1) supported this study.

Compliance with ethics requirements

This study does not involve any human or animal subjects.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Supplementary material

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