Selective Electrochemical Determination of Etoposide Using a Molecularly Imprinted Overoxidized Polypyrrole Coated Glassy Carbon Electrode

Table 1

Effect of excipients on the differential pulse voltammetric response at the MIP/GCE sensor.

Interfering molecule	Concentration	Signal increase	R.S.D. ()
	(10^-6 M)	()	(n=3)
Benzyl Alcohol	0.8	1.47	1.17
	2	1.56	1.11
	5	1.61	1.44
	8	1.76	1.02
Citric Acid	0.8	1.13	0.88
	2	1.39	1.24
	5	1.56	1.55
	8	1.73	1.45
Polysorbate 80	0.8	1.11	0.69
	2	2.75	0.37
	5	3.16	1.67
	8	3.33	0.93
Macrogol 300	0.8	1.14	1.66
	2	1.98	0.75
	5	2.49	0.66
	8	2.66	1.31

Concentration added to 10.0 mL of 5.0×10⁻⁶ M Etoposide solution.
Percent increase of analytical response after the addition of interfering molecule.