Mathematical Analysis for Growth Depression of Vibrio parahaemolyticus in Shrimp under a High Carbon Dioxide Atmosphere

Growth depression of Vibrio parahaemolyticus in pink shrimp under a high CO2 atmosphere was studied. A strain was isolated from prawn and identified as V. parahaemolyticus. The identified strain was used to inoculate pink shrimp and stored at 20°C under air, N2, and CO2. The plate count under CO2 16 h after inoculation was significantly lower than those under air and N2. The plate count under a steady state of CO2 was lower by log 3.6 to log 3.7 than those under air and N2. The growth of V. parahaemolyticus in/on the shrimp was fitted and simulated using the Gompertz equation and a new logistic model, to determine its growth rate parameters. CO2 reduced the value of the parameter equivalent to maximum plate count.