عنوان مقاله [English]
Interest in biodegradable films has been intensified in recent years. Chitosan and gelatin are biopolymers with preservative effects film forming ability to form antimicrobial and antioxidant films. In the current study, the effect of chitosan (1% w/v) and gelatin (3% w/v) film (composite and bilayer) incorporated with pomegranate peel extract was investigated on the storage of Belanger's croaker fillet in refrigerator (4±1°C) for 16 days. 5 treatment were packed including 1: control sample, 2: composite film, 3: bi-layer film, 4: composite film with pomegranate peel extract, 5: bi-layer film with pomegranate peel extract. Bacterial experiments (total count and pscychrotrophic bacteria) showed the anti bacacterial effect of chitosan-gelatin coating and film with or without pomegranate peel extract (p<0.05) but there was no significant difference between composite and bilayer (p>0.05). The count of Enterobacteriaceae bacteria of chitosan-gelatin film with pomegranate peel extract was lower than other samples. Lipid oxidation value experiments (thiobarbituric acid and free fatty acid values) showed lower oxidation value in film wrapped fillets in comparison with control sample. Thus, chitosan-gelatin as edible film (composite and bilayer) would enhance shelf life of Johnius belangerii fillet during refrigerated (4 ± 1°C) storage. The best of packaging method was the using of chitosan-gelatin film with pomegranate peel extract.
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