Table 2.

Validation data from calibration curves of compounds (4) and (5).

Compounds	Regression Equation	Correlation Coefficient (R2)	Linear Range (mg/mL)	Detection Limit (mg/mL)	Quantitation Limit (mg/mL)	Purity (%)
p-coumaric acid (4)	y = 4 × 107×−14.4	0.9924	0.000000–0.000008	1.10 × 10−7	3.32 × 10−7	99
4-methoxycinnamic acid (5)	y = 8 × 107× + 14.5	0.9835	0.000000–0.000008	5.48 × 10−7	1.66 × 10−7	96