The survivals of SM101 spores were reduced by 2.66 and
2.90 log CFU/ml when 200 ppm Quats were applied for 1 min to
spores germinated with AK at RT and 40
C(Fig. 3A), respectively.
In contrast, no significant reduction in survival of NB16 spores
was observed after inducing AK germination at 40
C followed by
1 min treatment with 200 ppm Quats (Fig. 3B). These results
suggest that spores of NFB isolates exhibit higher resistance to
Quats than that of FP isolates as was observed in the case of nisin
resistance (Udompijitkul et al., 2012). These differences might be
due to strain-specific susceptibility to Quats (Dawson et al., 2011).