Fabrication of an Amperometric Glucose Biosensor Based on a Prussian Blue/Carbon Nanotube/Ionic Liquid Modified Glassy Carbon Electrode

Document Type: Original Article

Authors

1 Department of Biology, Roudehen Branch, Islamic Azad University, Roudehen, Iran

2 Molecular Biology Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran

3 Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, Tehran, Iran

4 Nanobiotechnology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran

Abstract

An amperometric glucose biosensor was developed based on synergistic contributions of prussian blue (PB) and a bucky gel (BG) consisting of carbon nanotubes (CNTs) and ionic liquid (IL). The PB nanoparticles were first deposited onto the surface of a BG modified glassy carbon (GC) electrode (BG/GC). Then, the Ni2+ ions were electrochemically inserted into the PB lattice to improve its stability at physiological pH. Afterwards, Glucose oxidase (GOx) was immobilized on the BG/GC electrode using a cross-linking method. Amperometric measurements of glucose were performed at −0.05 V vs. Ag/AgCl in 0.05 M phosphate buffer solution at pH 7.4. The glucose biosensor exhibited a sensitivity of 45.03 µA/(mM.cm2) with a detection limit of 5×10-7 M. The amperometric response was linear in the range of 5×10-7 to 8.3×10−4 M.

Keywords


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