TABLE 7

INT-formazan formation by E. coli O157:H7 and L. monocytogenes cells suspended in PBS after treatment with continuous or pulsed (1,000 Hz/10% or 20 Hz/50%) UVC-LED irradiation

TreatmentFormazan formation (%)a
E. coli O157:H7L. monocytogenes
Control100.00 ± 2.01 A100.00 ± 1.87 A
Continuous90.12 ± 2.44 B98.12 ± 0.90 A
1,000 Hz/10%65.18 ± 1.56 C93.65 ± 1.59 B
20 Hz/50%45.32 ± 2.10 D85.37 ± 3.40 C
  • a The non-UV-treated groups were designated the controls. Data represent means ± standard deviations from three replications. Values followed by the same uppercase letters within columns for each microorganism are not significantly different.