Table 1. Variables and experimental design levels for RSM.
| Independent variables | Coded symbols | Levels | ||
|---|---|---|---|---|
| -1 | 0 | 1 | ||
| Ethanol concentration (%) | X1 | 40 | 60 | 80 |
| Ultrasonic intensity (W/cm2) | X2 | 1.6 | 3.3 | 5.0 |
| Solid-liquid ratio (mg/mL) | X3 | 20 | 25 | 30 |
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.