Degradation of meat quality has always been a burning issue in fish preservation. To maintain the quality, a novel combination of chlorogenic acid (CGA) and chitosan (CS) coating was applied to snakehead fish fillets. Fish fillets were soaked into 2% chitosan (2CS), 0.2% CGA in 2% chitosan (0.2CGA/2CS), 0.5% CGA in 2% chitosan (0.5CGA/2CS), or 1.0% CGA in 2% chitosan (1.0CGA/2CS) solution; and then, coated samples were vacuum-packaged and stored at 2 ± 0.5°C. pH values, color values, microbial loads, hardness, sensory qualities, and oxidization of lipids and proteins of stored fish fillets were investigated for 5 months. Antimicrobial activity was found to be nonsignificant ( ≤ .05) among different coated fish fillets, while color, antioxidant, and pH values were significantly ( ≤ .05) different. Lipid oxidation and protein oxidation were found to be inhibited in 2CS-, 0.5CGA/2CS- and 1.0CGA/2CS-coated fish fillet. All CGA/CS coating delayed increase in pH ( ≤ .05) and resulted brown color. However, only CS coating resulted in higher sensory scores ( ≤ .05) and controlled browning. Considering antioxidant properties and other quality parameters, CGA/CS coating might be applied commercially in fish preservation.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7020329 | PMC |
| http://dx.doi.org/10.1002/fsn3.1378 | DOI Listing |
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Article Synopsis
- Chitosan (CS) is a polysaccharide with beneficial properties but has limitations in solubility and antioxidant activity, which can be improved by grafting polyphenols onto it.
- The study successfully conjugated chlorogenic acid (CGA) and polydatin (PLD) to chitosan using a redox system, confirming the effectiveness of the bonding with various analytical techniques.
- The resulting polyphenol-chitosan conjugates exhibited enhanced antioxidant properties and strong antibacterial effects against several pathogenic bacteria, suggesting potential applications in food preservation.
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