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EFFECT OF CONCURRENT HIGH HYDROSTATIC PRESSURE, ACIDITY AND HEAT ON THE INJURY AND DESTRUCTION OF LISTERIA MONOCYTOGENES
Author(s) -
STEWART CYNTHIA M.,
JEWETT FREDERICK F.,
DUNNE C. PATRICK,
HOOVER DALLAS G.
Publication year - 1997
Publication title -
journal of food safety
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.427
H-Index - 43
eISSN - 1745-4565
pISSN - 0149-6085
DOI - 10.1111/j.1745-4565.1997.tb00173.x
Subject(s) - listeria monocytogenes , chemistry , hydrostatic pressure , strain (injury) , cabin pressurization , high pressure , nuclear chemistry , materials science , bacteria , composite material , thermodynamics , biology , physics , genetics , anatomy
The effect of concurrent use of high hydrostatic pressure, heat and acidity on Listeria monocytogenes Scott A and CA was investigated. In general, lethality was enhanced when cells were pressurized at higher temperatures or lower pH. Strain CA demonstrated an additional 3‐log 10 reduction when pressurized at pH 4.0 as compared with pH 6.0 at 353 MPa, 45C for 10 min. Scott A was reduced an additional 1 log 10 by increasing the temperature from 25C to 45C with pressurization at 252 MPa, pH 6.0 for 30 min. Exposure to 404 MPa at 45C for 30 min demonstrated complete injury or death of CA cells with an initial concentration of >10 8 CFU/mL. At least an 8‐log 10 reduction was observed for both L. monocytogenes strains Scott A and CA when exposed to the combined treatments of 252 MPa, 45C, pH 4.0 for 30 min .