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Type: Artigo
Title: Modeling growth kinetic parameters of salmonella enteritidis SE86 on homemade mayonnaise under isothermal and nonisothermal conditions
Author: Elias, Susana de Oliveira
Alvarenga, Veronica Ortiz
Longhi, Daniel Angelo
Sant’Ana, Anderson de Souza
Tondo, Eduardo Cesar
Abstract: During the last decade, a specific strain of Salmonella Enteritidis (named SE86) has been identified as the major etiological agent responsible for salmonellosis in the State of Rio Grande do Sul, Southern Brazil, and the main food vehicle was homemade mayonnaise (HM). This study aimed to model the growth prediction of SE86 on HM under isothermal and nonisothermal conditions. SE86 was inoculated on HM and stored at 7, 10, 15, 20, 25, 30, and 37°C. Growth curves were built by fitting data to the Baranyi's DMFit, generating r2 values greater than 0.98 for primary models. Secondary model was fitted with Ratkowsky equation, generating r2 and root mean square error values of 0.99 and 0.016, respectively. Also, the growth of SE86 under nonisothermal conditions simulating abuse temperature during preparation, storage, and serving of HM was studied. Experimental data showed that SE86 did not grow on HM at 7°C for 30 days. At 10°C, no growth was observed until approximately 18 h, and the infective dose (assumed as 106 CFU/g) was reached after 8.1 days. However, the same numbers of SE86 were attained after 6 hours at 37°C. Experimental data demonstrated shorter lag times than those generated by ComBase Predictive Models, suggesting that SE86 is very well adapted for growing on HM. SE86 stored under nonisothermal conditions increased population to reach about 106 CFU/g after approximately 30 hours of storage. In conclusion, the developed model can be used to predict the growth of SE86 on HM under various temperatures, and considering this pathogen, HM can be produced if safe eggs are used and HM is stored below 7°C
Subject: Salmonella
Country: Estados Unidos
Editor: Mary Ann Liebert
Rights: Fechado
Identifier DOI: 10.1089/fpd.2015.2045
Date Issue: 2016
Appears in Collections:FEA - Artigos e Outros Documentos

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