Inactivation of Planktonically Grown Habituated Salmonella Serovars Through Application of Elevated Hydrostatic Pressure

Inactivation of Planktonically Grown Habituated Salmonella Serovars Through Application of Elevated Hydrostatic Pressure

At 380 MPa, for treatments of 1 to 10 minutes, D-value of 1.35, 4-D reduction of 3.4, and inactivation Kmax of 3.34 were observed for Salmonella serovars.

D-values were 5.90 and 14.68 for treatments of 241 and 103 MPa, respectively.

Up to 1.01 and >7.22 log CFU/mL (i.e. >99.99999%) reductions (P<0.05) of habituated Salmonella serovars at planktonic stages were achieved using application of pressure at 380 MPa for 1 and 10 minutes, respectively.

Similarly, background microflora counts were reduced (P<0.05) by 1.68 to 5.29 log CFU/mL after treatment at 380 MPa for 1 and 10 minutes, respectively.

Treatments below two minutes were less efficacious (P≥0.05) against the pathogen and background microflora, in vast majority of time and pressure combinations.

Results of this study could be incorporated as a part of risk-based food safety management systems and risk assessment analyses for mitigation of public health burden of non-typhoidal Salmonella serovars.