Simple transfer across the water/nitrobenzene interface of three model quaternary ammonium cations: Tetramethylammonium (TMA+), Choline (Ch+) and Tetrabutylammonium (TBA+), was followed by Square Wave Voltammetry (SWV) which constitutes a more sensitive approach to ionic quantification compared to other conventional techniques. A linear and reproducible response was observed in the range of 10 ...

The voltammetric behaviour of Sulfadoxine (SDN) was studied at a glassy carbon electrode in 0.2 M phosphate buffer solutions using cyclic, differential-pulse (DPV) and square wave voltammetry (SWV). The dependence of the current on pH, concentration, and scan rate was investigated to optimize the experimental conditions for the determination of SDN. The oxidation process was shown to be diffusi...

Development of an electrochemical DNA biosensor based on a human interleukine-2 (IL-2) gene probe, using a pencil graphite electrode (PGE) as transducer and methylene blue (MB) as electroactive label is described. The sensor relies on the immobilization of a 20-mer single stranded oligonucleotide probe (hIL-2) related to the IL-2 gene on the electrode. The hybridization between the probe and it...

This work reports the use of modified screen-printed carbon electrodes (SPCEs) for identification three drugs abuse and two habitual cutting agents, caffeine paracetamol, combining voltammetric sensing chemometrics. In order to achieve this goal, codeine, heroin morphine were subjected Square Wave Voltammetry (SWV) at pH 7, in elucidate their electrochemical fingerprints. The optimized SPCEs el...

a fast and simple voltammetric method for the determination of methimazole in pharmaceutical products was reported. a glassy carbon electrode was pretreated by anodization at +1.75 v (vs. sce) for 5 min, followed by potential cycling in the range of 0.3-1.3 v (20 cycles). the pretreated electrode showed an excellent electrocatalytic effect on the oxidation of methimazole. compared with untreate...

a sensor, based on multi-wall carbon nanotubes modified glassy carbon electrode (mwcnt/gce), was developed for determination of fenitrothion. determining the surface area of mwcnt/gce showed that this surface is three times more active than that of a glassy carbon electrode. the experimental parameters, such as the amount of mwcnts, ph of the fenitrothion solution, preconcentration potential an...

Herein, fast Fourier transformation square-wave voltammetry (FFT-SWV) as a novel electrochemical determination technique was used to investigate the electrochemical behavior and determination of Riboflavin at the surface of a nanocomposite modified carbon paste electrode. The carbon paste electrode was modified by nanocomposite containing Samarium oxide (Sm2O3)/reduced gra...

Square-wave voltammetry (SWV) is applied to simulate two-step diffusional electrode mechanism, in which the electrochemically active species generated second redox step are involved a reversible follow-up chemical reaction. The model provides insight into relevant mechanistic and kinetic aspects of this complex mechanism. Alongside scenario separated SW voltammetric peaks for at least 150 mV (i...