Ultratrace determination of adenine in the presence of copper by adsorptive stripping voltammetry |
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Authors: | Farias P A de Luca Rebello Wagener A Castro A A |
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Institution: | Departament of Chemistry, Pontificia Universidade Católica, Rua Marquês de S?o Vicente, 225, CEP 22453-900 Rio de Janeiro, Brazil. |
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Abstract: | An electrochemical stripping procedure for ultra-trace measurements of adenine is described based on the adsorption of the adenine-copper complex on a static mercury drop electrode. Cyclic voltammetry was used to characterize the interfacial and redox behavior. Optimum experimental conditions were found when using a 0.005 M NaOH solution containing 0.4 ppm of copper, an accumulation potential of -0.30 V, a scan rate of 100 mV s(-1) and a linear scan mode. There is a linear response to adenine concentration in the range of 0.1-1.0 ppb and the detection limit for 6 min accumulation time was of 4.0 ppt (3.0x10(-11) M). Proper conditions for measuring the adenine in presence of guanine, thymine and cytosine were also investigated. The method was applied for the determination of adenine in a sample of single-stranded calf thymus DNA. |
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