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標題: Simultaneous determination of guanine and adenine contents in DNA, RNA and synthetic oligonucleotides using a chemically modified electrode
作者: Zen, J.M.
Chang, M.R.
Ilangovan, G.
關鍵字: performance liquid-chromatography;adsorptive stripping voltammetry;capillary zone electrophoresis;amperometric detection;nucleic-acids;carbon-paste;purine-bases;electrochemical detection;uric-acid;oxidation
Project: Analyst
期刊/報告no:: Analyst, Volume 124, Issue 5, Page(s) 679-684.
Simultaneous determination of guanine and adenine contents in DNA, RNA and synthetic oligonucleotides an a Nafion-ruthenium oxide pyrochlore modified electrode is described. This chemically modified electrode shows very pronounced electrocatalytic effects towards the oxidation of guanine and adenine. The experimental parameters for individual determinations of guanine and adenine on the modified electrode were first optimised. Excellent detection limits (S/N = 3) of 0.86 ng ml(-1) (5.7 nM) and 2.7 ng ml(-1) (20 nM) for guanine and adenine, respectively, were obtained. Simultaneous determination of guanine and adenine in a mixture was also optimised. The denatured calf thymus DNA and yeast RNA showed oxidation peaks corresponding to guanine and adenine with a linear calibration line up to 5 mu g ml(-1) in pH 4.0 phosphate buffer. The detection limit estimated for these nucleic acids were 11.5 ng ml(-1) and 37.7 ng ml(-1) for guanine and adenine, respectively. The new method provides an alternative to estimate the guanine and adenine contents more selectively and sensitively than currently applied techniques.
ISSN: 0003-2654
DOI: 10.1039/a900532c
Appears in Collections:化學系所

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