Amperometric aqueous sol–gel biosensor for low-potential stable choline detection at multi-wall carbon nanotube modified platinum electrode

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1、SensorsandActuatorsB115(2006)626633Amperometricaqueoussolgelbiosensorforlow-potentialstablecholinedetectionatmulti-wallcarbonnanotubemodifiedplatinumelectrodeZhaoSonga,Jia-DongHuanga,Bao-YanWua,Hai-BinShia,Jun-IchiAnzaib,QiangChena,∗aCollegeofLifeScience,NankaiUniver

2、sity,Tianjin300071,ChinabGraduateSchoolofPharmaceuticalSciences,TohokuUniversity,Aramaki,Aoba-ku,Sendai980-8578,JapanReceived1July2005;receivedinrevisedform23October2005;accepted24October2005Availableonline28November2005AbstractAnovelamperometricbiosensorbasedonthed

3、eterminationofH2O2liberatedbytheenzymecholineoxidase(ChOx)wasfabricatedbyimmobilizationofChOxintoasolgelsilicatefilmonthemulti-wallcarbonnanotubes(MWCNT)modifiedplatinumelectrode.Cyclicvoltammetricresultsclearlyshowedthatcarbonnanotubespossessanexcellentelectrocatalyt

4、icactivitytowardstheoxidationofH2O2atalowpotential(0.16VversusAg/AgCl).TheremarkablecatalyticpropertyofMWCNTwasfurtherexploitedasaselectivedeterminationschemeforcholineinthepresenceofsomeelectroactivecompounds.Experimentalparametersofthecholinesensor,suchasappliedpo

5、tential,pH,andtemperaturewerestudied.Theperformanceofthesensorshowedsensitivedeterminationofcholinewithalinearrangefrom5×10−6to1×10−4Mandaresponsetimeoflessthan8s.Thedetectionlimitofcholinewasdeterminedtobeabout1×10−7M.Thisbiosensorwasusedtodetectcholinereleasedfrom

6、LecithinbyphospholipaseD(PLD)inserumsamples.©2005ElsevierB.V.Allrightsreserved.Keywords:Electrocatalysis;Multi-wallcarbonnanotubes;Solgel;Choline;Hydrogenperoxide1.Introductionattemptshavebeenmadeduringpastyears,includingmak-inguseofnovelimmobilizationtechniquesandn

7、ewenzymeInseveraldifferentfieldscholinecanbefoundasamaincom-immobilizationmaterials[79].Glassycarbon(GC),graphite,ponentinmanyplantsandanimalorgans.Cholineisrequiredcarbonpaste,carbonfibers,andcarbonspheresarecommonlytomakeessentialmembranephospholipids,providingstruc

8、-usedaselectrodematerialsorbiosensorimmobilizationmatrixturetocellmembranesandfacilitatingtransmembranesignaling[1013].Amperometricbiosens