%0 Journal Article
%T Voltammetricdeterminationofascorbicacidinthepresenceofacetaminophenandtryptophanusinganimprovedcarbonnanotubepasteelectrode
%A Hadi BEITOLLAHI
%A Somayeh MOHAMMADI
%J ´ß»¯Ñ§±¨
%P 1098-1104
%D 2013
%R 10.1016/S1872-2067(12)60544-0
%X £¿Acarbonpasteelectrode(CPE)modifiedwithcarbonnanotubesand5-amino-3',4'-dimethyl-biphenyl-2-ol(5ADB)isprepared.UndertheoptimumpHof7.0,theoxidationofascorbicacid(AA)onthemodifiedCPEoccursatapotentialabout280mVlesspositivethanthatontheunmodifiedCPE.SomekineticandthermodynamicparametersforelectrocatalyticoxidationofAA,includingelectrontransfercoefficient(¦Á=0.58)anddiffusioncoefficient(D=2.2¡Á10-6cm2/s),arealsodetermined.AA,acetaminophen(AC),andtryptophan(TRP)weredetectedsimultaneouslyusingthemodifiedCPE.ThepeakpotentialsrecordedusingthemodifiedCPEinphosphate-bufferedsolutionatpH7.0were265,465,and780mVforAA,AC,andTRP,respectively.ThemodifiedCPEwassuccessfullyusedtodeterminetheconcentrationsofAA,AC,andTRPinrealsamples.
%K Ascorbicacid
%K Acetaminophen
%K Tryptophan
%K Carbonnanotubepasteelectrode
%K Electrocatalysis
%U http://www.chxb.cn/CN/abstract/abstract20923.shtml