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Levels of Independent Variables
| Factors (independent variables) | Levels of variables |
|---|---|
| X1: Chitosan grade | L-CH |
| M-CH | |
| H-CH | |
| X2: Concentration of chitosan solution (%) | 0.5 |
| 1 | |
| 2 |
L-CH Low molecular weight chitosan, M-CH medium molecular weight chitosan, H-CH high molecular weight chitosan
