Accuracy of the proposed method (n = 6).

Excess drug added to analyte (%)	Theoretical content (ng)	Conc. found (ng) ± SD	Recovery (%)	RSD (%)
0	200	199.33 ± 1.51	99.67	0.76
50	300	294.50 ± 2.74	98.17	0.93
100	400	395.00 ± 2.19	98.75	0.55
150	500	489.83 ± 4.40	97.97	0.90