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Determination of Nanomolar Levels of ‎Guanine by Differential-Pulse Adsorptive ‎Cathodic Stripping Voltammetry of its ‎Copper(II) Complex‎

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Mon, 2014-07-07 10:07 — Raqi Mohammad Hasan Shubietah
Journal Title, Volume, Page: 
Fresenius, J. Anal Chem., 348, 754-757
Year of Publication: 
1994
Link: 
http://link.springer.com/article/10.1007%2FBF00323699
Authors: 
R. M. Shubietah
Chemistry Department, Faculty of Science, UAE University, P.O. Box 17551, Al-Ain, United Arab Emirates
Current Affiliation: 
Department of Pharmacy, Faculty of Medicine and Health Sciences, An-Najah National University, Nablus, Palestine
[email protected]
A. Z. Abu Zuhri
Chemistry Department, Faculty of Science, UAE University, P.O. Box 17551, Al-Ain, United Arab Emirates
A. G. Fogg
Chemistry Department, Loughborough University of Technology, LE 11 3TU, Loughborough, Leicestershire, UK
Preferred Abstract (Original): 

Guanine is determined at the 5.0×10−10 −2.0×10−7 mol/l level by differential-pulse adsorptive stripping voltammetry at a hanging mercury drop electrode using the reduction peak of its copper (II) complex at −0.21 V vs. Ag-AgCl electrode. The optimum analytical conditions were found to be Britton-Robinson buffer solution (pH 4.8), an accumulation potential of 0.0 V and an accumulation time of 3 min. Under these conditions, the detection limit is 5.0×10−10 mol/l and the relative standard deviation 2.6% for 1.0×10−7 mol/l guanine. The method is compared with the previous voltammetric methods. The presence of some purine derivatives does not interfere.