Table 2. Parameters and their levels in biosynthesis of ZnO NPs .
| Symbol | Parameters | Unit | Level 1 | Level 2 | Level 3 |
| A | ZnCl2 concentration | Molar (M) | 0.1 | 0.01 | 0.001 |
| B | Glucose concentration | Molar (M) | 0.05 | 0.07 | 1 |
| C | Incubation temperature | °C | 25 | 30 | 37 |
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