Figure 4.

Viable counts of E. coli ATCC 25922 after incubation at 20 °C on modified polyurethane squares for (a) 4 h in the dark and (b) 2 h with exposure to white-light illumination with an average light intensity of 6600 ± 900 lx at a distance of 25 cm from the samples. *Bacterial counts were reduced to below the detection limit of 100 cfu/mL. OA indicates NPs synthesized with OA capping. Error bars are based on the standard deviation of three experimental replicates.