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

Figure 4

Optimization of chromatographic conditions. (a) Column temperature (20, 25, and 30°C). (b) Flow rate (0.5, 0.8, and 1.0 mL/min). (c) Mobile phase (acetonitrile-0.1% formic acid aqueous solution, acetonitrile-water, and acetonitrile-0.1% phosphoric acid aqueous solution).

(a)

(b)

(c)