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分离式阴极光电化学检测致病菌的新方法研究
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作者单位
杨高霞,董玉明,王光丽 江南大学化学与材料工程学院 
基金项目:国家自然科学基金项目(21275065,21575052)
中文摘要:利用液相法合成了水溶性的巯基乙酸修饰的硒化铅(PbSe)量子点(QDs),并将其修饰至氧化铟锡(ITO)电极,制备了ITO/PbSe电极。Zn2+可与电极上修饰的PbSe QDs进行离子交换形成ZnSe/PbSe/ZnSe量子阱(QW),促进电子-空穴分离,提高ITO/PbSe电极的阴极光电流。以抗菌肽为识别探针,开发出一种分离式光电化学(PEC)检测大肠杆菌O157∶H7(E.coli O157∶H7)的方法。该方法避免了生物分子固定在电极上所导致的PEC信号传输的延误,具有更好的检测效果。E.coli O157∶H7的检测范围为10.0~5.0×106 CFU/mL,检出限为4.0 CFU/mL,回收率为94.7%~104%,相对标准偏差为1.9%~2.8%。
中文关键词:光电化学分析  ZnSe/PbSe/ZnSe量子阱  大肠杆菌O157∶H7
 
A Novel Split-type Cathodic Photoelectrochemical Method for Detection of Pathogenic Bacteria
Abstract:A split-type photoelectrochemical(PEC)method was developed for the detection of Escherichia coli O157∶H7(E.coli O157∶H7)with antibacterial peptide as a recognizer.Firstly,water soluble thioglycolic acid capped lead selenide quantum dots(PbSe QDs)were synthesized by a simple water bath method,then PbSe QDs were assembled on surface of indium tin oxide(ITO)electrode through electrostatic interaction,and the Pb2+ on surface of PbSe QDs could be exchanged with Zn2+ to form a ZnSe/PbSe/ZnSe quantum well(QW),which could promote the electron-hole separation and improve the cathode photocurrent on the ITO/PbSe electrode.This method avoided the immobilized biomolecules on the electrodes to retard the PEC signal,and showed a highly efficient detection.The detection range of the method for E.coli O157∶H7 ranged from 10.0 CFU/mL to 5.0×106 CFU/mL with a detection limit of 4.0 CFU/mL.The recoveries varied from 94.7% to 104% with relative standard deviations of 1.9%-2.8%.
Key Words:photoelectrochemical sensor  ZnSe/PbSe/ZnSe quantum well  Escherichia coli O157∶H7
引用本文:杨高霞,董玉明,王光丽.分离式阴极光电化学检测致病菌的新方法研究[J].分析测试学报,2019,(8):897-904.
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