Comparison of fresh-keeping effects of Portunus trituberculatus by different package methods

Portunus trituberculatus is a famous aquatic variety in Ningbo city and melanin is often found in storage period. It is a big problem to prohibit melanin phenomenon and prolong storage period of Portunus trituberculatus. The study was made by three package methods: vacuum package, coating package and modified atmosphere package(MAP) .The fresh-keeping effects of Portunus Trituberculatus were investigated. The results showed the efects were better when air components and ratios of MAP were CO2 50% N2 50%. Compared with coating package and MAP, vacuum packing could inhibit the production of melanin in Portunus Trituberculatus gills and legs and prolong storage period effectively at 0-4℃.