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1、现代食品科技ModernFoodScienceandTechnology2015,Vol.31,No.4基于聚吡咯的胆固醇电化学生物传感器的制备及性能研究12211张秀花,万凯,梁振兴,金峰,朴金花(1.华南理工大学轻工与食品学院,广东广州510640)(2.华南理工大学化学与化工学院,广东广州510640)摘要:本文以胆固醇氧化酶和辣根过氧化物酶为催化剂,通过电化学聚合吡咯单体,制备了电流型胆固醇传感器。实验中采用电化学聚合方法制备了聚吡咯膜(PPY),用扫描电子显微镜(SEM)对聚吡咯膜进行微观结构表征,采用循环伏安(CV)法研究了传感器的电化学特
2、性及其抗干扰能力。结果表明,聚合圈数为300圈时得到的聚吡咯膜制备的传感器性能最佳,传感器最佳工作pH值为8.0,胆固醇氧化酶浓度为30mg/mL,辣根过氧化物酶浓度为20mg/mL,制备的胆固醇传感器,具有良好的检测性能,线性范围为app-6-4K-62.0×10~1.6×10mol/L,表观米氏常数m为5.6×10mol/L,葡萄糖、抗坏血酸、尿酸等组分对传感器响应电流的影响分别为8.1%、8.5%、10.8%,抗干扰效果较好。该传感器对胆固醇具有良好的选择性响应,可以用于胆固醇含量的测定。关键词:生物传感器;聚吡咯;胆固醇氧化酶;辣根过氧化物酶;
3、循环伏安法文章篇号:1673-9078(2015)4-170-174DOI:10.13982/j.mfst.1673-9078.2015.4.027DevelopmentandPropertiesofaPolypyrrole-basedElectrochemicalBiosensorforCholesterolDetection12211ZHANGXiu-hua,WANKai,LIANGZhen-xing,JINFeng,PIAOJin-hua(1.CollegeofLightIndustryandFoodSciences,SouthChinaUniv
4、ersityofTechnology,Guangzhou510640,China)(2.SchoolofChemistryandChemicalEngineering,SouthChinaUniversityofTechnology,Guangzhou510640,China)Abstract:Anovel,current-basedcholesterolbiosensorwasproducedbyelectrochemicalpolymerizationofpyrrolemonomers,usingcholesteroloxidase(ChOx)an
5、dhorseradishperoxidase(HRP)ascatalysts.Polypyrrole(PPY)waspreparedbyelectrochemicalpolymerizationandthemicrostructureofthePPYfilmwascharacterizedbyscanningelectronmicroscopy(SEM).Theelectrochemicalcharacteristicsandanti-interferencecapacityofthebiosensorwereevaluatedbycyclicvolt
6、ammetry(CV).TheresultsofthisanalysisrevealedthatthePPYfilmobtainedafter300polymerizationcircleshadoptimumsensorperformance.ThebiosensordisplayedoptimaloperationatapHof8.0andshowedgooddetectionperformanceatcholesteroloxidaseandhorseradishperoxidaseconcentrationsof30and20mg/mL,res
7、pectively.Theappbiosensordisplayedalinearrangeof2.0×10-6to1.6×10-4mol/LandanapparentMichaelis-Mentenconstant(Km)of5.6×10-6mol/L.Thebiosensoralsoexhibitedexcellentanti-interferenceactivityaftertheadditionofglucose,ascorbicacid(AA),anduricacid(UA),whichaffectedthecurrentby8.1%,8.5
8、%,and10.8%,respectively.Thecholesterolbiosensor