TABLE 1.
Independent variables and their levels were used in the response surface design.
| Independent variables | Levels | ||
|---|---|---|---|
| −1 | 0 | +1 | |
| Sonication time (X1) (min) | 30 | 50 | 70 |
| Sonication temperature (X2) (°C) | 50 | 60 | 70 |
| Stirring speed (X3) (rpm) | 500 | 750 | 1000 |
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.