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Comparison of Kinetic Models To Describe High Pressure and Gamma Irradiation Used To Inactivate Vibrio vulnificus and Vibrio parahaemolyticus Prepared in Buffer Solution and in Whole Oysters

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Comparisons of different models in inactivation kinetics were conducted on data obtained from high-pressure and gamma-irradiation processing. Vibrio vulnificus (MO-624) and Vibrio parahaemolyticus (O3:K6 TX-2103) suspended in phosphate-buffered saline (pH 7.4, 107 CFU/ml) were exposed to pressures from 207 to 379 MPa for 1 to 20 min. Inoculated whole oysters (106 CFU/g) were exposed to pressure from 276 to 379 MPa for 1 to 15 min. Pure cultures and inoculated oysters (106 CFU/g) also were irradiated (gamma irradiation) at doses of less than 3 kGy. Four mathematical models, the Bigelow model, Arrhenius equation, Fermi equation, and Weibull frequency distributions, were applied to microbial survival data, and performances of the different kinetic models were compared. Weibull frequency distributions can predict the high-pressure inactivation of Vibrio spp. with more accuracy in both pure cultures and inoculated oyster samples. The Fermi model provided a better description of gamma-irradiation inactivation kinetics compared with the traditional Bigelow model.

Document Type: Research Article

Affiliations: 1: Biological Systems Engineering Department, Virginia Polytechnic Institute & State University, 200 Seitz Hall, Blacksburg, Virginia 24060 2: Virginia Seafood Agricultural Research and Extension Center, Virginia Polytechnic Institute & State University, Virginia Sea Grant Program, 102 South King Street, Hampton, Virginia 23693 3: Experimental Seafood Processing Laboratory, Coastal Research & Extension Center, Mississippi State University, 2710 Beach Boulevard, Biloxi, Mississippi 39531, USA

Publication date: February 1, 2005

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