Optimization of a CUPRAC-Based HPLC Postcolumn Assay and Its Applications for Ginkgo biloba L. Extracts

Table 1

Validation characteristics of the CUPRAC postcolumn assay.

Standards	Intraday RSD (%) ()	Interday RSD (%) ()		Regression equation	LOD (µg mL^−1)	LOQ (µg mL^−1)	Linearity range (µg mL^−1)
Trolox	0.04	0.08	0.999		0.52	2.00	0.59–605
Quercetin	0.51	0.54	0.998		0.95	3.18	4.6–74
Kaempferol	0.38	0.39	0.996		0.66	2.22	5.2–84
Isorhamnetin	0.37	0.37	0.991		2.37	7.92	5.3–85

RSD: relative standard deviation, : correlation coefficient; LOD: limit of detection; LOQ: limit of quantitation.