Table 2.
Antimicrobial activity of commercial ZnO, ZnO nano, ZnO/CAT and ZnO/CA against Escherichia coli
| Samples | Sample concentration (μg/mL) | Concentration of incorporated Zn2+ (μg/mL)a | E. coli inhibition (%) |
|---|---|---|---|
| Commercial ZnO | 200 | 198 | 12.7 ± 0.7 |
| 500 | 495 | 100 ± 0.00 | |
| ZnO nano | 250 | 195 | 26.7 ± 2.0 |
| 300 | 234 | 45.0 ± 0.6 | |
| 350 | 273 | 100 ± 0.0 | |
| ZnO/CAT | 1700 | 173 | 6.8 ± 0.3 |
| 2000 | 204 | 56.0 ± 0.6 | |
| 2250 | 229.5 | 100 ± 0.0 | |
| ZnO/CA | 500 | 63 | 4.6 ± 0.9 |
| 750 | 94.5 | 44.0 ± 1.1 | |
| 1000 | 126 | 100 ± 0.0 |
aAverage concentration of incorporated Zn2+ as determined by atomic absorption spectrophotometry: commercial ZnO, 99%; ZnO nano, 78 mass%; ZnO/CAT, 10.2 mass%; ZnO/CA, 12.6 mass%