Table 1. The Independent Variables of BBD.
| levels |
|||||
|---|---|---|---|---|---|
| variables | symbol | unit | lowest (−1) | central (0) | highest (+1) |
| concentration of sodium cholate | A | % | 1.5 | 2.5 | 3.5 |
| concentration of PLGA | B | mg/mL | 15 | 20 | 25 |
| ratio of oil–water | C | % | 30 | 50 | 70 |
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