Effect of Different Packaging Methods on Protein Oxidation and Degradation of Grouper (Epinephelus coioides ) During Refrigerated Storage

Foods
Xicai ZhangJing Xie

Abstract

This study investigates the effect of different packaging methods-namely, air packaging (AP), vacuum packaging (VP), and modified atmosphere packaging (MAP)-on the protein oxidation and degradation of grouper (Epinephelus coioides) fillets during refrigerated storage. The carbonyl group, myofibril fragmentation index, free amino acids, FTIR of myofibrillar proteins, and total protein SDS-PAGE were determined. The results showed that the protein oxidation degree of the fillets gradually increased as the storage time increased. The FTIR results indicated that the secondary structure transformed from an α-helix to an irregular curl. SDS-PAGE confirmed the degradation of the myosin heavy chain, and that myosin gradually occurred during refrigerated storage. Meanwhile, protein oxidation and degradation were highly correlated. Protein degradation was accelerated by protein oxidation in myofibrils, which included the increase of protein surface hydrophobicity and changes of the secondary structure. In fact, the protein oxidation and degradation of the grouper fillets were effectively inhibited by MAP and VP during refrigerated storage, and MAP (30% N2 and 70% CO2) had the best results.

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Citations

Apr 3, 2020·Journal of Agricultural and Food Chemistry·Michael Hellwig
May 4, 2021·Critical Reviews in Food Science and Nutrition·Zuhaib F BhatHina F Bhat

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Methods Mentioned

BETA
electrophoresis
carbonylation

Software Mentioned

Origin
PeakFit
Quantity One
Omnic
SPSS
Systat

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