Spectrum-Effect Relationship between HPLC Fingerprints and Antioxidant Activity of Yangyin Tongnao Prescription

Table 5

The content of each group sample.

Compounds	Standard curve (R^2)	The content of each group sample (mg/mL)
		S1	S2	S3	S4	S5	S6	S7	S8	S9
Vanillic acid	Y = 1 × 10^7X − 7.89 × 10^4 (R^2 = 0.999)	0.059	0.056	0.048	0.069	0.059	0.068	0.054	0.064	0.063
Puerarin	Y = 1 × 10^7X − 1.30 × 10^4 (R^2 = 0.999)	2.397	2.230	1.940	2.458	2.071	2.460	1.807	2.198	2.182
Ferulic acid	Y = 3 × 10^7X + 6.59 × 10^4 (R^2 = 0.998)	0.024	0.021	0.018	0.028	0.013	0.026	0.017	0.022	0.025
Daidzein	Y = 8 × 10^6X + 9.69 × 10^4 (R^2 = 0.998)	0.124	0.130	0.124	0.116	0.106	0.130	0.043	0.064	0.086
Formononetin	Y = 2 × 10^6X + 1.63 × 10^4 (R^2 = 0.999)	0.155	0.163	0.162	0.159	0.159	0.158	0.158	0.157	0.155

R² is the square of the correlation coefficient, which can judge the fitting degree of the linear regression line.