Dispersion of multi-walled carbon nanotubes in [BMIM]PF 6 for electrochemical sensing of acetaminophen

The influence of functionalized multi-walled carbon nanotubes (fMWCNT) in the presence of 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM]PF6) in different ratios was investigated on the acetaminophen (ACOP) electrochemical determination. The electrochemical behavior of the ACOP exhibited a pair of well-defined redox peaks, suggesting that the reversibility of ACOP was significantly improved in comparison to irreversible oxidation peak on bare GCE. The redox process was controlled by adsorption, involves two electrons and the value of apparent rate constant (ks) was equal to 14.7 s-1 ± 3.6 s-1. The analytical curves were obtained for concentrations of ACOP ranging from 0.3 to 3.0 μmol L-1. The values of the detection limit were calculated from SWV and found to be 6.73 × 10-8 mol L-1. The proposed electrochemical sensor exhibited good stability and reproducibility and was applied for ACOP determination in tablets (Tylenol® and Tylenol®DC) with satisfactory results.The authors gratefully acknowledge funding provided by the following Brazilian agencies: CNPq-INCT (Proc. 573925/2008-9 and 573548/2008-0), CAPES/Funcap (2133/2012/Proc. 23038.007973/2012-90), CNPq-PVE (Proc. 400223/2014-7 and 303596/2014-7), PRONEX/FUNCAP (Proc. PR2-0101-00030.01.00/15) and CNPq (Proc. 302801/2014-6). R.N. Gomes thanks CAPES and C.P. Sousa thanks CAPES-PNPD for their grants. The authors also are grateful to the Central Analítica-UFC/CT-INFRA/MCTI-SISNANO/Pró-Equipamentos CAPES for technical support and Prof. Pierre Basílio Almeida Fechine and MsC. Davino Machado Andrade Neto for Zeta potential analysis.info:eu-repo/semantics/publishedVersio