Voltammetric immunosensor for human chorionic gonadotropin using a glassy carbon electrode modified with silver nanoparticles and a nanocomposite composed of graphene, chitosan and ionic liquid, and using riboflavin as a redox probe

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• 作者：Mahmoud Roushani ; Akram Valipour
• 关键词：Cyclic voltammetry ; Electrochemical impedance ; Differential pulse voltammetry ; Nanomaterial ; Hexacyanoferrate ; Scanning electron microscopy ; Tumor marker ; Pregnancy marker ; Trophoblasts
• 刊名：Microchimica Acta
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：183
• 期：2
• 页码：845-853
• 全文大小：976 KB
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• 作者单位：Mahmoud Roushani (1)
  Akram Valipour (1)
  
  1. Department of Chemistry, Ilam University, P.O. Box 69315516, Ilam, Iran
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Analytical Chemistry
  Inorganic Chemistry
  Physical Chemistry
  Characterization and Evaluation Materials
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  
• 出版者：Springer Wien
• ISSN：1436-5073

文摘

The aim of this study was to develop an electrochemical immunoassay system to detect of human chorionic gonadotropin (hCG). The immunosensor was constructed by covalent immobilization of silver nanoparticles (AgNPs) onto a nanocomposite containing graphene, chitosan (Chit) and 1-methyl-3-octylimidazolium tetrafluoroborate as ionic liquid (IL). Silver nanoparticles were used as a linker to immobilize hCG antibody onto the modified electrode. The amino groups of the antibody were covalently attached to an AgNP/g-IL-Chit nanocomposite. Cyclic voltammetry and electrochemical impedance spectroscopy were employed to characterize the assembly process of the immunosensor. Riboflavin was used as the redox probe. Differential pulse voltammetry demonstrated that the formation of antibody–antigen complexes decreases the peak current of redox pair at the AgNP/Gr-IL-Chit/GCE (at a working potential of −0.38 V). The signal changes of riboflavin are used to detect hCG with broad response ranges from 0.0212 to 530 mIU.mL−1 and a low detection limit of 0.0066 ± 0.02 mIU.mL−1.