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Analytical and Bioanalytical Chemistry

, Volume 408, Issue 22, pp 6213–6221 | Cite as

Impurity-induced peroxidase mimicry of nanoclay and its potential for the spectrophotometric determination of cholesterol

  • K. Aneesh
  • Chiranjeevi Srinivasa Rao Vusa
  • Sheela BerchmansEmail author
Research Paper

Abstract

A green version of the “Fe” impurity-induced peroxidase mimicry exhibited by simple and cheap substrate “nanoclay (NC)” along with the highly sensitive amperometric and spectrophotometric determination of cholesterol is demonstrated. The “Fe” impurity can act as the catalyst center for hydrogen peroxide reduction similar to the horseradish peroxidase (HRP)-catalyzed reaction. The Michaelis–Menten constant for the NC-catalyzed reaction is found to be lower than that of the HRP-catalyzed reaction indicating high affinity for the substrate. The NC-modulated peroxidase-like catalytic activity originates from the electron transfer between the reducing substrate in the catalyst center and H2O2 with the intermediate generation of hydroxyl radicals. The peroxidase mimicry is successfully applied for the low-potential electrochemical detection of H2O2 (linear detection range 1.96–10.71 mM, R 2 = 0.97). The H2O2 sensing platform is further modified with cholesterol oxidase (CHOx) for the spectrophotometric (linear detection range 50–244 μM, R 2 = 0.99) and amperometric detection of cholesterol (linear detection range 0.099–1.73 mM, R 2 = 0.998).

Graphical abstract

Peroxidase mimicry of nanoclay for the determination of cholesterol

Keywords

Micro/nano structures Nanoclay Peroxidase mimicry H2O2 detection Cholesterol detection 

Notes

Acknowledgments

We acknowledge the financial support from the project CSC0134 (M2D). Mr. K. Aneesh is thankful to CSIR, New Delhi, India, for the award of Senior Research Fellowship. The authors also acknowledge the help received from Mr. J. Kennedy, Central Instrumentation Facility, CECRI, for XPS analysis.

Compliance with ethical standards

The authors declare that they have no conflict of interest. All procedures performed in studies using human blood serum were in accordance with the ethical standards of the institution, and informed consent of all individual participants were taken for blood serum analysis.

Supplementary material

216_2016_9733_MOESM1_ESM.pdf (411 kb)
ESM 1 (PDF 410 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • K. Aneesh
    • 1
    • 2
  • Chiranjeevi Srinivasa Rao Vusa
    • 2
  • Sheela Berchmans
    • 1
    • 2
    Email author
  1. 1.Academy of Scientific and Innovative Research (AcSIR)ChennaiIndia
  2. 2.CSIR-Central Electrochemical Research InstituteKaraikudiIndia

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