Effect of modified atmosphere with varying O_2 concentrations on the quality of packed Pacific White Shrimp (Penaeus vannamei) during cold storage

摘要

The purpose of this study was to evaluate the effect of modified atmosphere packaging (MAP) with varying O_2 concentrations on the quality changes of Pacific white shrimp during cold storage at (4±1)°C by using the quality indices such as Total viable counts (TVC), TVB-N, pH, firmness, whiteness and sensory evaluation. Results showed that MAP inhibited the microbial growth and the spoilage which was confirmed by the lowered TVC and TVB-N. Among the four MAP groups, shrimp packaged in bags 40%CO_255%O_25%N_2 showed the lowest level of TVC and TVB-N, and shrimp in 40%CO_25%O_255%N_2 had the best appearance with lighter blackspots during storage. Low O_2 concentration packaging exhibited the ability to retard melanosis, but weakening the ability to impede the spoilage. Extremely high O_2 concentration with low CO_2 concentration packaging inhibit the microbial growth compared to the CK, but improved the melonasis of shrimp and reduced its sensory quality rapidly.