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催化学报  2014 

Applicationof3,4-dihydroxycinnamicacidasasuitablemediatorandmultiwallcarbonnanotubesasasensorfortheelectrocatalyticdeterminationofL-cysteine

DOI: 10.1016/S1872-2067(14)60065-6, PP. 1166-1172

Keywords: L-Cysteine,Multiwallcarbonnanotube,Voltammetry,3,4-Dihydroxycinnamicacid

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Abstract:

？AhighlysensitiveelectrochemicalsensorwaspreparedforthedeterminationofL-cysteineusingamodifiedmultiwallcarbonnanotubespasteelectrodeinthepresenceof3,4-dihydroxycinnamicacid(3,4-DHCA)asamediator,basedonanelectrocatalyticprocess.TheresultsindicatethattheelectrodeiselectrocatalyticallyefficientfortheoxidationofL-cysteineinthepresenceof3,4-DHCA.TheinteractionbetweenthemediatorandL-cysteinecanbeusedforitssensitiveandselectivedetermination.Usingchronoamperometry,thecatalyticreactionrateconstantwascalculatedtobe2.37×102mol-1Ls-1.ThecatalyticpeakcurrentwaslinearlydependentontheL-cysteineconcentrationintherangeof0.4-115μmol/L.Thedetectionlimitobtainedbylinearsweepvoltammetrywas0.25μmol/L.Finally,themodifiedelectrodewasexaminedasaselective,simple,andprecisenewelectrochemicalsensorforthedeterminationofL-cysteineinrealsamples.

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