Standardization of Tragopogon graminifolius DC. Extract Based on Phenolic Compounds and Antioxidant Activity

Table 1

Validation parameters of applied HPLC method.

Compounds	Precision (%)		Accuracy (%)	Slope	Correlation coefficient (%)	LOD (mg/mL)	LOQ (mg/mL)
	Intraday	Interday
Gallic acid	1.01	2.17	94.83	5.623	0.9959	0.105	0.319
Catechin	2.59	3.09	106.02	0.988	0.9939	0.130	0.393
Caffeic acid	2.46	2.32	105.14	3.719	0.9950	0.135	0.408
ρ-Coumaric acid	0.72	2.87	92.24	8.770	0.9905	0.162	0.490
Ferulic acid	1.46	2.93	107.21	4.943	0.9957	0.109	0.329