Simultaneous determination of dopamine, uric acid, and tryptophan using an MWCNT modified carbon paste electrode by square wave voltammetry

Authors : Hadi BEITOLLAHI, Alireza MOHADESI, Saeedeh KHALILIZADEH MAHANI

Pages : 526-536

View : 11 | Download : 5

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :A highly sensitive method was investigated for the simultaneous determination of dopamine insert ignore into journalissuearticles values(DA);, uric acid insert ignore into journalissuearticles values(UA);, and tryptophan insert ignore into journalissuearticles values(TRP); using a multiwall carbon nanotubes/5-amino-3`,4`-dimethoxy-biphenyl-2-ol modified carbon paste electrode insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(SWV); in 0.1 M phosphate buffer solution insert ignore into journalissuearticles values(PBS); at pH 7.0 was performed to determine DA in the range from 1.2 to 800.0 m M, with a detection limit of 0.16 m M. 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