Brian J Birch

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Addition of copper(II) to breakfast cereal samples was shown to significantly enhance the analytical signal obtained by electrochemical reduction of vitamin B(2) using linear sweep voltammetry on disposable carbon electrodes. The enhancement was observed only when dissolved oxygen was present. In model solutions the analytical signal was linear in the(More)
Hexacyanoferrate(III) was used as a mediator in the determination of total iron, as iron(II)-1,10-phenanthroline, at a screen-printed carbon sensor device. Pre-reduction of iron(III) at -0.2V versus Ag/AgCl (1M KCl) in the presence of hexacyanoferrate(II) and 1,10-phenanthroline (pH 3.5-4.5), to iron(II)-1,10-phenanthroline, was complete at the unmodified(More)
High-performance liquid chromatography with electrochemical detection (LCEC), incorporating a novel carbon-epoxy resin working electrode modified with cobalt phthalocyanine, has been employed for preliminary studies directed towards the determination of normal circulating levels of reduced glutathione (GSH) in human plasma. The mobile phase consisted of(More)
Methodologies for the determination of vitamin B(2) in food matrixes and a premix using simple sample conditioning steps coupled with a convenient and cheap electrochemical sensing device are presented. Electrochemical analysis based on differential pulse voltammetry (DPV) coupled to carbon electrodes gave a well-defined reduction peak at -0.42 V versus a(More)
High-performance liquid chromatography with electrochemical detection by means of a re-polishable graphite-epoxy resin composite electrode, modified with the electrocatalyst cobalt phthalocyanine, has been used for the determination of reduced glutathione (GSH) in 25-mul samples of whole blood. The mobile phase was O.O5M phosphate buffer (pH 2.3) containing(More)
Anodic voltammetry at a stationary glassy-carbon electrode has beeen applied to the determination of phosphate (in the presence of silicate), silicate (in the presence of phosphate), arsenate and germanate as beta-heteropolymolybdates stabilized with acetone, with the solution conditions of existing calorimetric procedures. bl.
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