Fabrication of TiO2-Carbon Paste Modified Electrochemical Sensor for 4-Aminophenol in Pharmaceutical Samples


  • Wollo University, Department of Chemistry, Dessie, Ethiopia
  • Mekelle University, Department of Chemistry, College of Natural and Computational Sciences, Mekelle, Ethiopia
  • Baba Mastnath University, SBMN Institute of Pharma Sci and Res, Harayana, 124021, India


In this study the electrochemical behavior of 4-aminophenol at titanium dioxide modified carbon paste electrode was investigated using cyclic voltammetry. The working parameters for both, cyclic- and square wave- voltametric studies have been optimized using 5.0 mM 4-aminophenol (4-APOH) in 0.1 M NaH2PO4.2H2O buffer solution. The modified rather than unmodified carbon paste sensor, in neutral medium, has exhibited strong electro-catalytic activity towards the redox characteristics of 4-aminophenol by showing two-fold peak current enhancement and 174 mV peak potential shift towards negative direction. The red-ox peak current ratio (I pa/I pc = 1.6) suggested high accumulation efficiency of 4-APOH at the modified sensor. The redox process is quasi reversible and involves the transference of 2e-s and 2H+s followed by diffusion controlled, non-adsorptive behavior of 4-APOH on the surface of sensor at the interface. Further, the electro-catalytic behavior of the modified sensor has been exploited for quantitative determination of 4-aminophenol in pharmaceutical samples using square wave voltammetry. Under optimal experimental conditions, there was a linear relationship between peak current and concentration in the range 2.5 × 10-5 to 2.0 × 10-4 M with a correlation coefficient of 0.998 and limit of detection 1.38 × 10-8 M. The method was successfully applied for the quantitative determination of 4-aminophenol in pharmaceutical formulations against the commercial drugs viz., PANADOL, and Paracetamol at recovery level of 100 ± 1.7 %.


4-Aminophenol, Cyclic Voltammetry, Commericial Drugs, TiO2-Carbon Sensor, Square Wave Voltammetry.

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