Voltammetric Sensors and Sensor System Based on Gold Electrodes Modified with Polyarylenephthalides for Cysteine Recognition

Russian Journal of Electrochemistry - Voltammetric sensors and a sensor system based on gold electrodes modified with polyarylenephthalides (chlorinated polyphthalidylidene fluorene and...     

Voltammetric identification of insulin and its analogues using glassy carbon electrodes modified with polyarylenephthalides

Using chemometrics, we developed a voltammetric method for the identification and discrimination of pharmaceuticals containing insulin and its analogues from various manufacturers. Their electrochemical behavior on glassy carbon electrodes modified with polyarylenephthalide films is studied; analytical characteristics are evaluated; and the optimal conditions for recording the analytical signal and the nature of electrode processes are determined. Some examples of the voltammetric identification and recognition of pharmaceutical products containing insulin are given.     

A Sensor for the Recognition and Determination of Tryptophan Enantiomers Based on Carbon-Paste Electrode Modified by Enantiomorphic Crystals of Bromotriphenylmethane

Journal of Analytical Chemistry - We developed an enantioselective voltammetric sensor based on a carbon-paste electrode modified by enantiomorphic crystals of bromotriphenylmethane for the...     

Voltammetric determination of bisoprolol on a glassy carbon electrode modified by poly(arylene phthalide)

New voltammetric sensors based on glassy carbon electrodes (GCEs) modified by poly(arylene phthalide) are studied. The electrochemical behavior of bisoprolol on GCEs modified by poly(arylene phthalide) is investigated. The effects of potential scan rate, time of accumulation on the electrode, pH of supporting electrolyte, and concentration on the current of bisoprolol electrooxidation are estimated. A procedure is developed for the voltammetric determination of bisoprolol on glassy carbon electrodes modified by poly(arylene phthalide). The dependence of the analytical signal on the concentration of bisoprolol is linear in the range 10^–6–10^–5 M with the limit of detection (3.4–9.8) × 10^–8 M.     

An enantioselective voltammetric sensor for the recognition of propranolol stereoisomers

An enantioselective voltammetric sensor for the recognition of propranolol stereoisomers is developed based on a carbon-paste electrode modified with uracil supramolecular structures and the use of chemometric methods. The conditions for the formation of an enantioselective selector on the surface of graphite (graphene) particles and the selective registration of voltammograms of enantiomers, as well as the possibility of the recognition thereof, are studied by methods of molecular dynamics simulation and voltammetry.