TABLE 2

Reductions of three pathogens on culture media after treatment with continuous or pulsed UVC-LED irradiation at different duty ratios

MicroorganismReduction (log CFU/ml)a
Continuous10%50%
SelectiveNonselectiveSelectiveNonselectiveSelectiveNonselective
E. coli O157:H72.10 ± 0.06 A2.33 ± 0.07 B1.91 ± 0.13 A2.63 ± 0.13 B2.93 ± 0.71 A2.80 ± 0.19 A
S. Typhimurium1.69 ± 0.42 A1.35 ± 0.18 A1.85 ± 0.28 A1.41 ± 0.10 A2.91 ± 0.06 A2.47 ± 0.48 A
L. monocytogenes0.86 ± 0.57 A0.57 ± 0.24 A0.92 ± 0.06 A0.96 ± 0.08 A1.56 ± 0.11 A1.26 ± 0.25 A
  • a Dosages of 1 mJ/cm2 for E. coli O157:H7 and 3 mJ/cm2 for S. Typhimurium and L. monocytogenes were irradiated onto the media. Data represent means ± standard deviations from three replications. Values followed by the same uppercase letters within rows for each treatment type are not significantly different.