McCann, M. S., McDowell, D. A. and Sheridan, J. J. (2009) Effects of reduction in beef surface water activity on the survival of Salmonella Typhimurium DT104 during heating. JOURNAL OF APPLIED MICROBIOLOGY, 106 (6). pp. 1901-1907. [Journal article]
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Aim: To investigate the influence of reducing beef surface water activity (aw) on the survival of Salmonella Typhimurium DT104 during heating.Methods and Results: Beef discs were surface inoculated with S. Typhimurium DT104 and either untreated or dried to achieve surface aw values of 0·95, 0·85 and 0·70. The samples were vacuum packed, heat-treated at 60°C and removed at predetermined times. The inactivation curves were influenced by aw and treatment time. Biphasic inactivation curves were observed for S. Typhimurium DT104 heat-treated on beef samples with altered aw values, which were characterized by an initial decline in cell numbers at commencement of heating followed by a much slower rate of inactivation during the remaining treatment period. Point estimates of the heating time required to achieve a 1 log reduction on beef surfaces with aw of 0·99, 0·95, 0·85 and 0·70 were 0·5, 1·55, 11·25 and 17·79 min, respectively.Conclusions: A decrease in beef surface aw can substantially enhance the survival of S. Typhimurium DT104 after heating.Significance and Impact of the Study: Caution needs to be taken using dry air as a decontamination method as this may rapidly decrease product surface and pathogen aw values resulting in enhanced survival.
|Item Type:||Journal article|
|Faculties and Schools:||Faculty of Life and Health Sciences|
Faculty of Life and Health Sciences > School of Health Sciences
|Research Institutes and Groups:||Biomedical Sciences Research Institute|
Biomedical Sciences Research Institute > Infection and Immunity/Microbiology
|Deposited By:||Professor David McDowell|
|Deposited On:||30 Jan 2010 17:34|
|Last Modified:||12 Mar 2013 14:04|
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