Background: Preservative effect of melanin ‑ free extract of Sepia esculenta ink (MFESI) on Sparus latus fillet has been verified in our previous work. This study aims to further approach the mechanism of MFESI for extending the shelf ‑ life of fish fillet during cold storage. Tilapia fillets were treated with different dosage of MFESI (0, 15, 25 and 35 mg/ ml) and packed with preservative film for succedent cold ‑ storage at 4 °C for scheduled time. Contents of total volatile basic nitrogen and sulfydryl and carbanyl groups were measured for evaluating protein oxidation. Malondialdehyde contents were measured for estimating lipid peroxidation and loss of water was used to determine water‑ holding capacity of fillet. Results: The data indicated that MFESI not only possessed certain degree of antioxidant capacity in vitro, also lengthened shelf‑ life of tilapia fillet in cold ‑ storage condition. Apart from 15 mg/ml, both 25 and 35 mg/ml of MFESI obviously prevented lipid and protein from oxidation and reduced loss of water from tilapia fillets, and the latter was more effective than the former. Conclusion: MFESI can repress lipid peroxidation and protein oxidation and reduce water loss, maintain the tilapia fillets quality and, thus,
Chemistry Central Journal – Springer Journals
Published: Mar 14, 2018
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