Utility of Activated Glassy Carbon and Pencil Graphite Electrodes for Voltammetric Determination of Nalbuphine Hydrochloride in Pharmaceutical and Biological Fluids

Table 4

Determination of NP. HCl in urine samples using PGE and GCE electrodes.

Sample	Urine spiked (µM)	Detected (µM)	Recovery %	RSD %
PGE
1	3.33	3.31	99.39	1.13
2	6.66	6.70	100.60	0.72
3	10.0	9.97	99.7	0.43
4	13.3	13.29	99.92	0.68
5	16.6	16.51	99.46	1.24
GCE
1	12.5	12.39	99.12	0.942
2	25.0	24.71	98.84	1.22
3	37.5	37.1	98.93	1.07
4	50.0	50.23	100.46	0.88
5	62.5	62.12	99.39	0.954