title: Functionalized polypyrrole nanotube arrays as electrochemical biosensor for the determination of copper ions.
abstract: A novel electrochemical biosensor based on functionalized polypyrrole (PPy) nanotube arrays modified with a tripeptide (Gly-Gly-His) proved to be highly effective for electrochemical analysis of copper ions (Cu(2+)). The vertically oriented PPy nanotube arrays were electropolymerized by using modified zinc oxide (ZnO) nanowire arrays as templates which were electrodeposited on indium-tin oxide (ITO) coated glass substrates. The electrodes were functionalized by appending pyrrole-α-carboxylic acid onto the surface of polypyrrole nanotube arrays by electrochemical polymerization. The carboxylic groups of the polymer were covalently coupled with the amine groups of the tripeptide, and its structural features were confirmed by attenuated total reflection infrared (ATR-IR) spectroscopy. The tripeptide modified PPy nanotube arrays electrode was used for the electrochemical analysis of various trace copper ions by square wave voltammetry. The electrode was found to be highly sensitive and selective to Cu(2+) in the range of 0.1-30 μM. Furthermore, the developed biosensor exhibited a high stability and reproducibility, despite the repeated use of the biosensor electrode.
authors.affiliation: Key Laboratory of Coastal Zone Environmental Processes, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Yantai 264003, PR China.
authors.forename: Meng
authors.initials: M
authors.lastname: Lin
authors.forename: Xiaoke
authors.initials: X
authors.lastname: Hu
authors.forename: Zhaohu
authors.initials: Z
authors.lastname: Ma
authors.forename: Lingxin
authors.initials: L
authors.lastname: Chen
mesh_terms: D015374:Biosensing Techniques / Q000379:methods*; D003300:Copper / Q000032:analysis* / Q000737:chemistry; D055664:Electrochemical Techniques; D004566:Electrodes; D008855:Microscopy, Electron, Scanning; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D053770:Nanowires / Q000737:chemistry* / Q000648:ultrastructure; D009842:Oligopeptides / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D011758:Pyrroles / Q000737:chemistry*; D015203:Reproducibility of Results; D013055:Spectrophotometry, Infrared; D017971:Tin Compounds / Q000737:chemistry; D015034:Zinc Oxide / Q000737:chemistry
chemical_list: D009842:Oligopeptides; D011108:Polymers; D011758:Pyrroles; D017971:Tin Compounds; C067635:polypyrrole; C109984:indium tin oxide; C037026:diglycyl-histidine; D003300:Copper; D015034:Zinc Oxide