Title of article :
Simultaneous determination of dopamine, uric acid, and tryptophan using an MWCNT modified carbon paste electrode by square wave voltammetry
Author/Authors :
BEITOLLAHI, Hadi International Center for Science, High Technology Environmental Sciences - Research Institute of Environmental Sciences - Environment Department, ايران , Mohadesi, Alireza payame noor university - Department of Chemistry, تهران, ايران , KHALILIZADEH MAHANI, Saeedeh payame noor university - Department of Chemistry, تهران, ايران , KARIMI-MALEH, Hassan islamic azad university - Department of Chemistry, ايران , AKBARI, Ali jiroft university - Department of Chemistry, جيرفت, ايران
Abstract :
A highly sensitive method was investigated for the simultaneous determination of dopamine (DA), uric acid (UA), and tryptophan (TRP) using a multiwall carbon nanotubes/5-amino-3’,4’-dimethoxy-biphenyl -2- ol modified carbon paste electrode (5ADMBCNPE). The 5ADMBCNPE displayed excellent electrochemical catalytic activities towards the oxidation of DA, UA, and TRP. The electrochemical profile of the proposed modified electrode was analyzed by cyclic voltammetry (CV), which showed a shift in the oxidation peak potential of DA at 160 mV to a less positive value compared with an unmodified carbon paste electrode. Square wave voltammetry (SWV) in 0.1 M phosphate buffer solution (PBS) at pH 7.0 was performed to determine DA in the range from 1.2 to 800.0 μM, with a detection limit of 0.16 μM. The present method was applied to the determination of DA in some real samples.
Keywords :
Dopamine , uric acid , tryptophan , carbon nanotube paste electrode , modified electrode
Journal title :
Turkish Journal of Chemistry
Journal title :
Turkish Journal of Chemistry
