Quality Assessment of Ojeok-San, a Traditional Herbal Formula, Using High-Performance Liquid Chromatography Combined with Chemometric Analysis

Table 2

Regression, correlation coefficient (), LOD, and LOQ of the marker compounds of OJS.

Compound	UV wavelength	Regression equation		Linear range (g/mL)		LOD (g/mL)	LOQ (g/mL)
		Slope	Intercept
Gallic acid	270 nm	39,349	4,315	0.63–5.00	0.9995	0.015	0.047
Protocatechuic acid	260 nm	42,285	2,576	0.31–5.00	0.9994	0.014	0.043
Chlorogenic acid	325 nm	32,676	9,500	1.56–25.00	0.9994	0.019	0.056
Albiflorin	230 nm	10,703	2,218	1.56–25.00	0.9998	0.057	0.172
Paeoniflorin	230 nm	15,956	−377	4.69–75.00	1.0000	0.038	0.115
Ferulic acid	325 nm	44,533	17,050	1.56–25.00	0.9993	0.014	0.041
Liquiritin	275 nm	24,585	12,410	4.69–75.00	0.9999	0.025	0.075
Benzoic acid	230 nm	38,560	11,910	1.56–25.00	0.9998	0.016	0.048
Nodakenin	335 nm	34,254	17,529	4.69–75.00	0.9999	0.018	0.054
Hesperidin	280 nm	18,406	25,320	10.94–175.00	0.9999	0.033	0.100
Naringin	280 nm	15,468	20,566	10.94–175.00	0.9999	0.039	0.119
Neohesperidin	280 nm	25,094	24,132	7.81–125.00	0.9999	0.024	0.073
Ononin	250 nm	58,807	3,317	0.31–5.00	0.9994	0.010	0.031
Oxypeucedanin hydrate	310 nm	16,087	2,865	1.56–25.00	0.9993	0.038	0.114
Cinnamic acid	275 nm	93,234	10,584	0.63–10.00	0.9998	0.007	0.020
Byakangelicin	270 nm	23,738	5,392	1.56–25.00	0.9994	0.026	0.077
Cinnamaldehyde	290 nm	156,619	8,846	0.33–5.25	0.9996	0.004	0.012
Benzoylpaeoniflorin	230 nm	28,272	274	0.16–2.50	0.9997	0.021	0.065
Glycyrrhizin	250 nm	6,765	1,864	1.56–25.00	0.9993	0.090	0.272