Table 2.

Linearity, LOD, and LOQ of oleanolic acid and ursolic acid.

Compound	tR (min)	Equation (Linear Model) a	Linear Range (mg/mL)	r2 b	LOD c (μg/mL)	LOQ d (μg/mL)
Oleanolic acid	21.35	y = 5417.6554x − 0.1599	0.005–0.05	0.9999	0.5520	1.6463
Ursolic acid	24.04	y = 4692.4373x + 0.1368	0.005–0.05	0.9999	0.5458	1.6783

^a y: peak area at 210 nm; x: standard concentration (mg/mL); ^b r²: coefficient of determination with 5 indicated points in the calibration curves; ^c LOD: limit of detection, S/N = 3 (n = 6); ^d LOQ: limit of quantification, S/N = 10 (n = 6).