Zirconia-poly(propylene imine) dendrimer nanocomposite based electrochemical urea biosensor

Sudheesh K. Shukla, Ajay K. Mishra, Bhekie B. Mamba, Omotayo A. Arotiba

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

In this article we report a selective urea electrochemical biosensor based on electro-co-deposited zirconia-polypropylene imine dendrimer (ZrO2-PPI) nanocomposite modified screen printed carbon electrode (SPCE). ZrO2 nanoparticles, prepared by modified sol-gel method were dispersed in PPI solution, and electro-co-deposited by cyclic voltammetry onto a SPCE surface. The material and the modified electrodes were characterised using FTIR, electron microscopy and electrochemistry. The synergistic effect of the high active surface area of both materials, i.e. PPI and ZrO2 nanoparticles, gave rise to a remarkable improvement in the electrocatalytic properties of the biosensor and aided the immobilisation of the urease enzyme. The biosensor has an ampereometric response time of ~4s in urea concentration ranging from 0.01mM to 2.99mM with a correlation coefficient of 0.9985 and sensitivity of 3.89μAmM-1cm-2. The biosensor was selective in the presence of interferences. Photochemical study of the immobilised enzyme revealed high stability and reactivity.

Original languageEnglish
Pages (from-to)48-55
Number of pages8
JournalEnzyme and Microbial Technology
Volume66
DOIs
Publication statusPublished - 1 Nov 2014

Keywords

  • Electro-co-deposition
  • Electrochemical biosensor
  • Nanocomposite
  • Poly (propylene imine) dendrimer
  • Urea
  • Urease enzyme
  • ZrO nanoparticle

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Biochemistry
  • Applied Microbiology and Biotechnology

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