Table 1.
The levels of experimental factors.
| HS | co-HS | |
|---|---|---|
| 1 | RH40 | Glycerol |
| 2 | EL30 | Lecithin |
| 3 | RH40/Span80 = 9:1 | Propylene glycol |
| 4 | EL30/Span80 = 9:1 | / |
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