Table 6.

Stability of the analytes in rat plasma

Analyte	Conc. added (ng/ml)	Short-term stability		Autosampler stability		Freeze-thaw stability (three cycles)		Four-week stability
		Conc. found (%)	RSD (%)	Conc. found (%)	RSD (%)	Conc. found (%)	RSD (%)	Conc. found (%)	RSD (%)
GC	2.5	98.42±5.67	5.76	95.28±9.00	9.45	97.15±10.03	10.32	98.10±7.21	7.35
	10	101.02±4.35	4.31	104.95±2.84	2.71	102.94±3.48	3.38	103.76±8.29	7.99
	50	103.40±9.78	9.46	97.40±5.16	5.29	98.37±4.81	4.89	97.57±3.42	3.51
BB	12.5	87.60±4.52	5.16	84.59±10.79	12.76	90.10±5.27	5.85	105.67±10.12	9.58
	50	97.56±4.66	4.78	122.30±2.19	1.79	109.64±5.00	4.56	96.74±9.01	9.31
	250	105.12±10.24	9.74	100.84±5.90	5.85	102.29±5.30	5.18	97.11±10.08	10.38
QCT	2.5	101.65±3.41	3.35	104.43±7.73	7.40	98.72±6.81	6.90	101.31±11.09	10.95
	10	104.42±4.56	4.37	113.21±7.98	7.05	101.21±8.75	8.65	97.10±7.23	7.45
	50	101.74±7.88	7.75	98.97±9.05	9.14	105.31±7.64	7.25	102.35±8.22	8.03
GB	6.25	93.72±5.67	6.05	105.71±3.57	3.37	105.20±9.27	8.81	98.70±8.34	8.45
	25	98.67±6.78	6.87	114.43±1.55	1.35	104.52±5.65	5.41	100.78±5.48	5.44
	125	104.14±7.99	7.67	108.76±5.10	4.69	110.19±3.39	3.07	95.77±5.63	5.88
GA	12.5	106.24±10.34	9.73	79.73±5.88	7.37	89.05±4.91	5.51	97.70±6.80	6.96
	50	109.12±4.01	3.67	118.25±3.20	2.71	103.68±6.47	6.24	101.21±5.84	5.77
	250	90.31±6.74	7.46	89.14±3.13	3.52	90.97±2.98	3.28	98.81±4.45	4.50
KMF	2.5	107.34±5.43	5.06	96.83±9.89	10.21	96.55±7.32	7.58	97.99±7.22	7.37
	10	100.72±2.45	2.43	98.73±4.82	4.88	104.93±7.54	7.19	102.31±6.78	6.63
	50	98.97±3.21	3.24	102.3±7.15	6.99	99.74±8.71	8.73	108.98±12.11	11.11
ISR	2.5	104.54±4.54	4.34	87.98±5.75	6.54	89.74±5.25	5.85	101.16±9.12	9.02
	10	101.23±6.77	6.69	112.32±5.78	5.15	101.72±5.67	5.57	103.45±7.76	7.50
	50	98.78±7.68	7.77	100.44±6.91	6.88	105.50±9.78	9.27	98.79±6.34	6.42

The values for the concentration found are expressed as mean±SD, n=3. GC: ginkgolide C; BB: bilobalide; QCT: quercetin; GB: ginkgolide B; GA: ginkgolide A; KMF: kaempferol; ISR: isorhamnetin; RSD: relative standard deviation