GROWTH KINETICS of LISTERIA IN the PRESENCE of OXYRASETMENZYME IN A BROTH MODEL SYSTEM1

摘要

The growth ofListeria monocytogenesand otherListeriaspecies (L. innocua, L. ivanovii, L. seeligeri, andL. welshimeri) (initial inocula of 103‐103CFU/mL) at 35C in the absence (as controls) or presence of OxyraseTMenzyme was studied using Fraser broth. the results showed that the generation times of these organisms ranged from 35.5 to 54.4 min for the studies with OxyraseTMand from 39.4 to 72.7 min for the studies without OxyraseTM. the degree of growth enhancement by OxyraseTMwas dependent on species/strains ofListeriaand population of inocula. an earlier initial increase in populations of three strains ofL. monocytogenesat 35C was observed in Fraser broth with OxyraseTMadded, and the lag phase durations computed for LM 101M, LM 103M, and Scott A were shown to be 3.2, 1.6, and 2.4 h shorter in the presence of OxyraseTMthan in the controls. For the range of 0 to 0.8 unit/mL added OxyraseTMtested, the growth ofL. monocytogenesdemonstrated a dose‐response to the amount of OxyraseTMin the broth sys