Species Classification and Quality Assessment of Cangzhu (Atractylodis Rhizoma) by High-Performance Liquid Chromatography and Chemometric Methods

Table 1

Orthogonal experimental design factors and levels for ultrasonic-assisted extraction process.

Variables	Levels
	1	2	3
(A) Extraction time (min)	30	60	90
(B) Amount of solvent (mL)	40	50	60
(C) Extraction temperature (°C)	30	40	50
(D) Ultrasonic frequency (kHz)	40	50	60