Table 4.
Independent variables and levels in BBD.
| Independent Variables | Symbol | Level | ||
|---|---|---|---|---|
| −1 | 0 | 1 | ||
| Extraction temperature (°C) | X 1 | 60 | 70 | 80 |
| Extraction time (min) | X 2 | 20 | 25 | 30 |
| Liquid-solid ratio (mL/g) | X 3 | 80 | 100 | 120 |
| Ultrasonic power (W) | X 4 | 180 | 225 | 270 |
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.