Research Article
Optimization Extraction of Shikonin Using Ultrasound-Assisted Response Surface Methodology and Antibacterial Studies
Table 1
Independent factors and their levels used in ultrasonic extraction.
| | Independent factors | Symbol | Levels | | −1 | 0 | 1 |
| | Liquid-solid ratio | A | 5 : 1 | 10 : 1 | 15 : 1 | | Ultrasonic time (min) | B | 75 | 90 | 105 | | Extraction temperature (°C) | C | 30 | 40 | 50 | | Ultrasonic power (W) | D | 60 | 90 | 120 |
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