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High, medium and low levels for BBD to determine the influence of concentration of CH, TPP, as well as stirring speed on PS and EE of CH-NPs.
| Variables | Units | Levels | ||
|---|---|---|---|---|
| High (+1) | Medium (0) | Low (−1) | ||
| CH concentration | % w/v | 0.5 | 1 | 1.5 |
| TPP concentration | % v/v | 0.4 | 0.8 | 1.2 |
| Stirring speed | rpm | 500 | 750 | 1000 |
