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Electrochemical analysis of copper ion using a Gly–Gly–His tripeptide modified poly(3-thiopheneacetic acid) biosensor

A novel biosensor harnessing a conducting polymer functionalized with a copper ion specific peptide proved to be highly effective for electrochemical analysis of copper ions. The developed sensor comprised a transducer based on a conducting polymer (poly(3-thiopheneacetic acid)) electrode and a prob...

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Published in:Biosensors & bioelectronics 2009-09, Vol.25 (1), p.28-33
Main Authors: Lin, M., Cho, M.S., Choe, W.S., Lee, Y.
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description A novel biosensor harnessing a conducting polymer functionalized with a copper ion specific peptide proved to be highly effective for electrochemical analysis of copper ions. The developed sensor comprised a transducer based on a conducting polymer (poly(3-thiopheneacetic acid)) electrode and a probe (tripeptide, Gly–Gly–His) selectively cognitive of copper ions. For functionalization of the electrode, the carboxylic group of the polymer was covalently coupled with the amine group of the tripeptide, and its structural features were confirmed by X-ray photoelectron spectroscopy (XPS) and attenuated total reflection infrared (ATR-IR) spectroscopy. The peptide modified polythiophene biosensor was used for the electrochemical analysis of various trace metal ions by square wave voltammetry. The electrode was found to be highly sensitive and selective to Cu 2+ in the range of 0.02–20 μM with almost no cross binding to other metal ions such as Ni 2+ and Pb 2+. Furthermore, the developed sensor exhibited a high stability and reproducibility despite the repeated use of the sensor electrode and probe. With the advent of more diverse affinity bioprobes specific towards a broad range of analytes, the demonstrated strategy harnessing peptide modified polythiophene biosensor is likely to provide an excellent platform for the selective determination of trace amount of analytes whose detection is otherwise cumbersome.
doi_str_mv 10.1016/j.bios.2009.05.035
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The developed sensor comprised a transducer based on a conducting polymer (poly(3-thiopheneacetic acid)) electrode and a probe (tripeptide, Gly–Gly–His) selectively cognitive of copper ions. For functionalization of the electrode, the carboxylic group of the polymer was covalently coupled with the amine group of the tripeptide, and its structural features were confirmed by X-ray photoelectron spectroscopy (XPS) and attenuated total reflection infrared (ATR-IR) spectroscopy. The peptide modified polythiophene biosensor was used for the electrochemical analysis of various trace metal ions by square wave voltammetry. The electrode was found to be highly sensitive and selective to Cu 2+ in the range of 0.02–20 μM with almost no cross binding to other metal ions such as Ni 2+ and Pb 2+. Furthermore, the developed sensor exhibited a high stability and reproducibility despite the repeated use of the sensor electrode and probe. 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The developed sensor comprised a transducer based on a conducting polymer (poly(3-thiopheneacetic acid)) electrode and a probe (tripeptide, Gly–Gly–His) selectively cognitive of copper ions. For functionalization of the electrode, the carboxylic group of the polymer was covalently coupled with the amine group of the tripeptide, and its structural features were confirmed by X-ray photoelectron spectroscopy (XPS) and attenuated total reflection infrared (ATR-IR) spectroscopy. The peptide modified polythiophene biosensor was used for the electrochemical analysis of various trace metal ions by square wave voltammetry. The electrode was found to be highly sensitive and selective to Cu 2+ in the range of 0.02–20 μM with almost no cross binding to other metal ions such as Ni 2+ and Pb 2+. Furthermore, the developed sensor exhibited a high stability and reproducibility despite the repeated use of the sensor electrode and probe. 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Psychology</topic><topic>Gly–Gly–His</topic><topic>Methods. Procedures. 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subjects Biological and medical sciences
Biosensing Techniques - methods
Biosensor
Biosensors
Biotechnology
Conducting polymer
Conducting polymers
Copper
Copper - analysis
Copper ion
Electrochemical analysis
Electrochemistry - methods
Electrodes
Fundamental and applied biological sciences. Psychology
Gly–Gly–His
Methods. Procedures. Technologies
Oligopeptides - chemistry
Peptide
Peptides
Polymers - chemistry
Polythiophene
Sensitivity and Specificity
Sensors
Spectrometry, X-Ray Emission
Spectrophotometry, Infrared
Thiophenes - chemistry
Various methods and equipments
title Electrochemical analysis of copper ion using a Gly–Gly–His tripeptide modified poly(3-thiopheneacetic acid) biosensor
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