Table 1.

Validation data for the target analytes in guava leaves.

Analyte	Concentration range (μg mL−1)	Calibration curve	LOD (μg mL−1)	LOQ (μg mL−1)	Spiked level (μg mL−1)	Precision, RSD%		Relative recovery, % (RSD, %) (n = 5)
						Intraday (n = 5)	Interday (n = 5)
Oleanolic acid	1–160	y = 2611x − 909.59	0.36	1.2	12	1.95	2.55	109.0 (0.38)
					24			97.4 (3.32)
					36			108.2 (3.18)
Ursolic acid	2–320	y = 1950x + 6240.8	0.18	0.6	60	1.48	1.18	101.6 (4.10)
					120			99.2 (2.53)
					180			111.4 (7.14)