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 2

The Calibration curve of liquiritin, deoxyschizandrin, and tanshinone II A under the external standard method.

	Range (μg/mL)	Slope (mean ± SD)^b	Intercept (mean ± SD)^b	R^2	LOD^a (μg/mL)	LOQ^a (μg/mL)
Liquiritin	10.00–150.00	7.20 ± 0.41	23.14 ± 1.52	0.9994	3	10
Deoxyschizandrin	15.00–180.00	9.45 ± 0.11	21.77 ± 0.62	0.9984	5	15
Tanshinone II A	5.00–150.00	6.07 ± 0.06	30.90 ± 1.05	0.999	1.5	4.5

^aLimit of detection (LOD) at S/N = 3 and limit of quantification (LOQ) at S/N = 10. ^bData are presented as mean ± SD (n = 3).