Experimental levels of variables.
| Variables | Codes | Levels | ||||
|---|---|---|---|---|---|---|
| −α (lowest) | −1 (lower) | 0 (center) | +1 (higher) | +α (highest) | ||
| GO (mg mL−1) | A | 1.98223 | 2.5 | 3.75 | 5 | 5.51777 |
| AuNR (mL) | B | 3.9645 | 5 | 7.5 | 10 | 11.0355 |
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