Preliminary Studies on Liquiritin, Deoxyschizandrin, and Tanshinone II A as Potential Anti-Neurodegenerative Disease Agent: Determination by Reverse-Phase Liquid Chromatography in Tianwang Buxin Pills

Table 3

The calibration curve of liquiritin, deoxyschizandrin, and tanshinone II A under the internal standard method.

	Range (μg/mL)	Slope (mean ± SD)^a	Intercept (mean ± SD)^a	R^2
Liquiritin	10.00–150.00	(1.5 ± 0.1) × 10^−3	(4.8 ± 0.3) × 10^−3	0.9994
Deoxyschizandrin	15.00–180.00	(1.9 ± 0.1) × 10^−3	(4.8 ± 0.2) × 10^−3	0.9984
Tanshinone II A	5.00–150.00	(1.2 ± 0.1) × 10^−3	(6.3 ± 0.2) × 10^−3	0.9992

^aData presented as mean ± SD (n = 3).