Optimization of Extraction of Compound Flavonoids from Chinese Herbal Medicines Based on Quantification Theory and Evaluation of Their Antioxidant Activity

Table 6

The correlation between antioxidant activity and concentration of CFs.

Antioxidant arrays	Optimal fitting functions	Determination coefficients (R^2)
DPPH	Ya = 4.5121Ln(Xc) + 86.613	0.9707
ABTS	Ya = 17.607Ln(Xc) + 65.62	0.9983
Hydroxyl	Ya = 9.9148Ln(Xc) + 100.5	0.9623
Reducing power	Ya = 0.5229Xc + 0.0288	0.9585

X_c is the concentration of CFs and Y_a is the antioxidant activity corresponding to X_c.