Evaluation of Two Parts of Lithocarpus polystachyus Rehd. from Different Chinese Areas by Multicomponent Content Determination and Pattern Recognition

Figure 3

Optimization of LP extraction conditions. (a) Solvent type (methanol, 50% methanol, 70% methanol, ethanol, 50% ethanol, and 70% ethanol). (b) Solvent volume (10, 15, 20, 25, and 30 mL). (c) Ultrasonic time (10, 15, 20, 25, and 30 min).

(a)

(b)

(c)