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Microchimica Acta

, 185:297 | Cite as

Amperometric determination of As(III) and Cd(II) using a platinum electrode modified with acetylcholinesterase, ruthenium(II)-tris(bipyridine) and graphene oxide

  • Manju Bhargavi Gumpu
  • Murugan Veerapandian
  • Uma Maheswari Krishnan
  • John Bosco Balaguru Rayappan
Original Paper

Abstract

The authors describe an amperometric biosensor for the determination As(III) and Cd(II) based on the inhibition of the enzyme acetylcholineesterase (AChE). A platinum electrode was modified with ruthenium(II)-tris(bipyridyl), graphene oxide and AChE and then showed redox peaks at 0.06 and 0.2 V vs Ag/AgCl in the presence of acetylthiocholine chloride (ATChCl). Amperometry unveiled a steady-state turnover rate with the release of thiocholine. In the presence of arsenic(III) and cadmium(II), AChE showed an inhibitive response at 0.214 and 0.233 V vs Ag/AgCl, respectively. The electrode exhibits a detection limit and linear range of 0.03 μM and 0.05–0.8 μM for As(III) and 0.07 μM and 0.02–0.7 μM for Cd(II), respectively. Type of inhibition and inhibition constants induced by As(III) and Cd(II) on the catalytic sites of AChE were determined from Dixon and Lineweaver-Burk plots. The modified electrode was applied to the determination of As3+ and Cd2+ in river, tap and waste water, and the results proved that the method is sensitive and can be an alternative to chromatographic and spectroscopic techniques.

Graphical abstract

Schematic presentation of Pt/Ru(II)-tris(bipy)-GO/AChE electrode in absence and presence of metal ions (As3+/Cd2+).

Keywords

Biosensor Electron transfer Competitive inhibition Mixed inhibition Dixon plot Lineweaver-Burk plot Ethylene diamine tetraacetic acid 

Notes

Acknowledgements

This work is supported by Department of Science & Technology, New Delhi (DST/TM/WTI/2 K14/197(a)(G)), (SR/FST/ETI-284/2011 (C)), SASTRA (Deemed to be University), Thanjavur. Dr. Manju Bhargavi Gumpu expresses sincere thanks to Science and Engineering Research Board, Department of Science and Technology for Post-Doctoral Fellowship (PDF/2017/001206).

Compliance with ethical standards

The author(s) declare that they have no competing interests.

Supplementary material

604_2018_2822_MOESM1_ESM.docx (1.9 mb)
ESM 1 (DOCX 1978 kb)

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  • Manju Bhargavi Gumpu
    • 1
    • 2
  • Murugan Veerapandian
    • 3
  • Uma Maheswari Krishnan
    • 4
  • John Bosco Balaguru Rayappan
    • 1
    • 2
  1. 1.Nano Sensors Lab, Centre for Nanotechnology & Advanced Biomaterials (CeNTAB), School of Electrical EngineeringSASTRA (Deemed to be University)ThanjavurIndia
  2. 2.School of Electrical & Electronics EngineeringSASTRA (Deemed to be University)ThanjavurIndia
  3. 3.CSIR- Central Electrochemical Research InstituteKaraikudiIndia
  4. 4.School of Chemical and BiotechnologySASTRA (Deemed to be University)ThanjavurIndia

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