Table 2.

Intra-day and inter-day precisions and accuracies for the determination of the seven analytes (n = 3 days, 6 replicates per day).

Compounds and added concentration (ng/ml)	Intra-day (n = 6)			Inter-day (n = 6)
Found concentration (ng/ml)	Precision RSD (%)	Accuracy RE (%)	Found concentration (ng/ml)	Precision RSD (%)	Accuracy RE (%)
Quercetin
0.666	0.65 ± 0.03	4.99	−1.90	0.66 ± 0.03	3.11	−0.73
6.666	5.83 ± 0.13	2.35	−12.54	5.83 ± 0.14	2.77	−12.62
53.33	46.80 ± 1.20	2.08	−12.24	46.68 ± 0.98	2.27	−12.48
Kaempferol
0.25	0.25 ± 0.02	6.75	1.33	0.26 ± 0.02	3.72	2.22
2.5	2.38 ± 0.05	3.46	−4.67	2.33 ± 0.09	4.87	−6.78
20	19.19 ± 0.65	2.53	−4.07	19.75 ± 0.61	6.39	−6.27
Isorhamnetin
0.5	0.50 ± 0.04	5.94	0.67	0.51 ± 0.03	8.99	2.44
5	4.67 ± 0.08	2.55	−6.60	4.65 ± 0.11	0.76	−6.93
40	36.87 ± 0.89	2.14	−7.83	37.05 ± 0.97	4.92	−7.39
Bilobalide
0.666	0.60 ± 0.03	4.38	−10.66	0.59 ± 0.03	4.29	−10.99
6.666	6.54 ± 0.18	2.86	−1.94	6.45 ± 0.21	5.26	−3.28
53.33	53.44 ± 1.47	2.63	0.21	51.78 ± 1.76	6.98	−2.91
Ginkgolide A
0.5	0.49 ± 0.04	6.89	−3.00	0.47 ± 0.03	8.22	−5.67
5	5.17 ± 0.12	3.41	3.4	5.27 ± 0.18	3.92	5.34
40	43.48 ± 1.24	2.42	4.85	42.36 ± 1.26	5.65	5.90
Ginkgolide B
0.833	0.91 ± 0.05	3.45	9.04	0.92 ± 0.03	3.67	10.98
8.333	8.89 ± 0.26	3.34	6.62	8.83 ± 0.29	3.33	5.96
66.66	69.62 ± 2.34	2.57	4.44	69.01 ± 1.75	2.29	3.52
Ginkgolide C
0.833	0.81 ± 0.08	7.51	−3.36	0.80 ± 0.06	1.82	−3.56
8.333	8.36 ± 0.17	2.07	0.26	8.22 ± 0.23	5.71	−1.42
66.66	65.99 ± 1.97	2.64	−1.01	65.73 ± 1.64	0.82	−1.39