Table 3.
Antibacterial efficacy of silver, zinc oxide, and silver–zinc oxide nanoparticles against Escherichia coli and Staphylococcus aureus on polyester surfaces. Average of the bacterial counts expressed in log CFU/cm2 with standard deviation included.
| Type of Biocidal Surface | Concentration | Antibacterial Efficacy | |
|---|---|---|---|
| E. coli | S. aureus | ||
| Ag-NPs | 400 | 2.35 ± 0.46 d G | 2.38 ± 0.41 c F |
| 500 | 4.14 ± 0.44 c F | 2.89 ± 0.33 b E | |
| 650 | 4.67 ± 0.40 b DE | 3.62 ± 0.43 a CD | |
| 850 | 4.90 ± 0.31 a BC | 3.84 ± 0.37 a C | |
| ZnO-NPs | 400 | 0.12 ± 0.51 c K | 0.17 ± 0.58 d J |
| 500 | 0.25 ± 0.71 c J | 0.47 ± 0.83 c I | |
| 650 | 0.83 ± 0.57 b I | 0.83 ± 0.65 b H | |
| 850 | 2.07 ± 1.01 a H | 1.19 ± 0.92 a G | |
| Ag-ZnO NPs | 400 + 400 | 4.57 ± 0.36 d E | 3.63 ± 0.33 c D |
| 500 + 400 | 4.75 ± 0.37 c CD | 3.77 ± 0.41 c C | |
| 650 + 400 | 4.89 ± 0.36 b C | 4.39 ± 0.41 b B | |
| 850 + 400 | 5.11 ± 0.31 a A | 4.80 ± 0.47 a A | |
a–d Mean values in the same column with different lowercase letters corresponding to each type of biocide are significantly different (p < 0.05). A–K Mean values in the same row with different capital letters are significantly different (p < 0.05).