%0 Journal Article
%T ACarbonNanotubeModifiedElectrodeforDeterminationofCaffeinebyDifferentialPulseVoltammetry
%A Biuck HABIBI
%A Mehri ABAZARI
%A Mohammad Hossien POURNAGHI-AZAR
%J ´ß»¯Ñ§±¨
%P 1783-1790
%D 2012
%R 10.1016/S1872-2067(11)60438-5
%X £¿Asimpleandsensitiveelectrochemicaldetectionofcaffeine(CAF)usingasingle-walledcarbonnanotubesoncarbon-ceramicelectrode(SWCNT/CCE)isreported.CAFwasoxidizedatthesurfaceofthemodifiedelectrodetoproduceananodicpeakat1.38Vversusthesaturatedcalomelelectrodein0.01mol/L,pH1.7H2SO4solutionincyclicvoltammetry.Theexperimentalparameters,namely,typeofelectrolyte,pHvalue,andamountofSWCNTscasted,wereoptimized.Usingtheoptimumconditions,theanodicpeakcurrentindifferentialpulsevoltammetrywaslinearwithCAFconcentrationintherangeof2.5¡Á10-7-1.0¡Á10-4mol/L.Thedetectionlimitwas1.2¡Á10-7mol/L(S/N=3).Themodifiedelectrodeexhibitedgoodstabilityandcanbeeasilyregenerated.Therelativestandarddeviationofthepeakcurrentobtainedfora5.0¡Á10-5mol/LCAFsolutionwas3.0%.Theinfluenceofsomeimportantbiologicalcompounds,namely,ascorbicacid,dopamine,anduricacidandaddictivecompoundslikecodeine,morphine,andacetaminophenontheCAFanodicpeakcurrentwasexamined.ThemethodwassuccessfullyappliedforthedeterminationofCAFinsomepracticalsamples.
%K caffeine
%K electrocatalysis
%K electrochemicaldetermination
%K single-walledcarbonnanotube
%K carbon-ceramicelectrode
%U http://www.chxb.cn/CN/abstract/abstract20846.shtml