Here we report on the optimisation of a reagentless enzyme sensor for the detection of azide based on the mediated reduction of O2 by a laccase enzyme co-immobilised in a redox hydrogel on electrode surfaces. The sensor response is shown to be influenced by the enzyme loading, the electrolyte pH and ionic strength. The response of the sensor is stable, decreasing by only 25% over a sixteen-hour...

The acid-treated multi-walled carbon nanotubes (MWNTs), which were modified on the surface of gold electrode, offers substantial improvements in voltammetric sensitivity and selectivity towards the determination of dopamine (DA). It can inhibit the voltammetric response of ascorbic acid (AA) while the redox reaction of dopamine is promoted. When a differential pulse voltammetric (DPV) technique...

Thin-film gold electrodes were produced by radio-frequency sputtering using a polyvinyl chloride foil as substrate. The voltammetric behavior was characterized in various electrolyte solutions. In alkaline and neutral aqueous solutions reliable voltammetric measurements can be performed while in acidic media some nondefined phenomena occur. A novel type of electrode for batch injection analysis...

An amperometric metronidazole (MTZ) sensor using a glycosylated metalloporphyrin as a recognition element, which was incorporated in a carbon paste electrode, is reported. For the preparation of a MTZ-sensitive active material, 5, 10, 15, 20tetrakis [2-(2, 3, 4, 6-tetraacetyl-β-D-glucopyranosyl)-1-O-phenyl]porphyrin (T(oglu)PPH2) and its Mn(III) complex MnT(o-glu)PPCl were synthesized from the ...

This paper reports the characterization of an electrochemical biosensor for the continuous monitoring of Naproxen based on cytochrome P450. The electrochemical biosensor is based on the drop-casting of multi-walled carbon-nanotubes (MWCNTs) and microsomal cytochrome P4501A2 (msCYP1A2) on a graphite screen-printed electrode (SPE). The proposed biosensor was employed to monitor Naproxen (NAP), a ...

In this study, an electrochemical sensor for the quantification of folic acid with voltam­metric detection in physiological conditions was constructed. For purpose, nickel ferrite (NiFe2O4) nanoparticles were used to modify surface a screen-printed graphite electrode (NiFe2O4/SPGE) and applied determination acid. The modified displays strong response Folic determined electrochemically using dif...

Anionic detergents have been shown to lower markedly the differential-pulse voltammetric peak currents obtained for 12-molybdophosphate and 12molybdosilicate in aqueous solutions, but when ethanol water or acetone water (1 + 1 V / V ) solutions are used there is no interference. Static differential-pulse voltammetric and flow injection voltammetric procedures have been developed for the determi...

Electrochemical reactions in which H+ or OH? ions are produced consumed, affect the pH near electrode surface. Probing locally is therefore highly desired to understand and model reaction environment under operando conditions. We carried out interfacial measurements mass transport control using a rotating ring-disc (RRDE) coupled with our recently developed voltammetric sensor. The disc detecte...