Effect of pH of the recovery medium on the apparent heat resistance of three strains of Bacillus cereus.
The influence of pH of the recovery medium, in the range 7.6-5.4, on the apparent heat resistance of three strains of Bacillus cereus (ATCC 4342, 7004 and 9818) has been investigated. The highest counts of heat-injured spores were obtained at pH near neutral, decreasing markedly as pH was reduced, especially with longer heating times. When the media were acidified, the apparent D-values tended to decrease, although some exceptions related to the strain and the nature of the medium were observed. z-Values determined were not affected by the pH of the medium.
González
I
I
Tecnologia de los Alimentos, Facultad de Veterinaria, León, Spain.
López
M
M
Mazas
M
M
Bernardo
A
A
Martín
R
R
D001409:Bacillus cereus / Q000254:growth & development* / Q000302:isolation & purification; D015169:Colony Count, Microbial; D003470:Culture Media / Q000737:chemistry*; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D013171:Spores, Bacterial / Q000254:growth & development / Q000302:isolation & purification
D003470:Culture Media