Effects of modified atmosphere packaging combined with tea polyphenol treatment on the quality of grass carp during cold storage

In this study, the effect of tea polyphenols (TP) combined with modified atmosphere packaging on the quality change of Cri fish fillets in cold storage was studied, expecting to provide a new strategy for the biological preservation of fish fillets. Fresh fillets were packed in three different methods as follows: Sprayed in 0.5% tea polyphenols solution (CP group);Sprayed in 0.5% tea polyphenols combining 50% CO2 + 50% N-2 modified atmosphere packaging (MAPC group);50% CO2 + 50% N-2 modified atmosphere packaging (MAP group) and fresh filletsb was control group. All four groups were storaged at 0 degrees C condition. Total bacterial count, TVB-N, TBA, K and pH were periodically assessed. The microscopic morphology of muscle tissue after 10 days cold storage was observed. After 10 d of cold storage, the TVC in the MAPC group (4.43 +/- 0.25 lg cfu/g) was obviously lower than that in the MAP group (5.04 +/- 0.65 lg cfu/g) or CP group (4.90 +/- 0.21 lg cfu/g), and even lower than that in the control group (6.14 +/- 0.17 lg cfu/g). The control group revealed the most obvious growth trend, increasing from 0.15 +/- 0.03 mg MDA/kg to 0.65 +/- 0.14mg MDA/kg, followed by MAP group (0.15 +/- 0.08 mg MDA/kg to 0.52 +/- 0.07mg MDA/kg), and CP group (0.13 +/- 0.05 mgMDA/kg to 0.47 +/- 0.03mg MDA/kg), and the last was the MAPC group with the minimum amplification (0.14 +/- 0.02 mg MDA/kg to 0.47 +/- 0.13 mg MDA/kg).Tea polyphenols combining with modified atmosphere packaging is a new strategy in maintaining the quality of crisped grass carp during cold storage.