Sensitivity of Listeria monocytogenes to irradiation.
Irradiation of Listeria monocytogenes was carried out in culture media and pork meat paste at room temperature with 60Co radiation source of 6.6 kGy.h-1 dose rate. The employed doses were 0, 0.5, 1, 2, 3, 4 and 6 kGy. Because of the expected great number of injured cells, parallel to the direct counting at selective media, liquid as well as solid resuscitation methods were used. One strain of out 3 survived as high as 4 kGy irradiation. Radiation with 2 kGy resulted 7 log cycles reduction of cell count. After lower irradiation doses the L. monocytogenes count decreased in proportion to increasing doses. It has been concluded that L. monocytogenes, compared with Gram-negative pathogens, are less sensitive to irradiation.
Tarján
V
V
Central Food Research Institute, Budapest, Hungary.
D004307:Dose-Response Relationship, Radiation; D004755:Enterobacteriaceae / Q000528:radiation effects; D005516:Food Microbiology; D005720:Gamma Rays; D008089:Listeria monocytogenes / Q000528:radiation effects*; D012680:Sensitivity and Specificity