Multi-walled carbon nanotubes (MWCNTs) were immobilized on the surface of a glassy carbon electrode (GCE) in the presence of cetyltrimethylammonium bromide (CTAB) to form a MWCNTs-CTAB nanocomposite-modified electrode. The electrocatalytic response of the modified electrode towards tryptophan (Trp) was investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The surface...

a highly sensitive differential pulse polarographic (dpp) method has been developed for the determination of trace amounts of osmium, based on the catalytic effect of osmium (viii) on the oxidation of pyrogallol red (pgr) by sodium bromate at ph 7.00 and 25.0 0.1 ? c. the reaction rate was monitored by measuring the differential pulse cathodic current of the oxidation product of pgr and bromate...

In the presence of pyridine and other ligands osmium tetroxide binds covalently to pyrimidine bases in DNA. Properties of osmium-modified native and denatured calf thymus DNA, and plasmid Co1E1 DNA were investigated by means of differential pulse polarography, absorption spectrophotometry, circular dichroism, agarose gel electrophoresis, and nuclease S1 digestion. A great difference in the reac...

Flow-injection analysis (FIA) has become popular in many laboratories due to its flexibility. FIA is a type of continuousflow analysis which uses an analytical stream, unsegmented by air bubbles, into which highly reproducible volumes of sample are injected. Application of this principle to automated or semiautomated analysis yields a fast, precise, accurate and extremely versatile system that ...

In their brochure The Principles and Applications of Cathode-Ray Polarography Southern Analytical Ltd. (Camberley, Surrey, U.K.) refer to a paper in which one of their cathode-ray polarographs is used for the determination of amino acids containing thiol and disulphide groups (Coult, 1958). This work apparently takes no account of the fact that the shape of a rapid-sweep polarogram is more depe...

Quantitative and qualitative studies suggest that zinc is concentrated in the mossy fiber boutons of the hippocampus and is believed to exist as a chelatable cytosolic pool. These studies were aimed at testing the hypothesis that a zinc-binding protein(s) or an amino acid pool in the cytosol is responsible for the sequestration of zinc. For comparison with the hippocampus, the cerebellum was ch...