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http://dx.doi.org/10.5806/AST.2010.23.2.165

A glucose biosensor based on deposition of glucose oxidase onto Au nanoparticles poly(maleic anhydride)-grafted multiwalled carbon nanotube electrode  

Piao, Ming-Hua (Department of Chemistry, Hannam University)
Son, Pyeong-Soo (Department of Chemistry, Hannam University)
Chang, Choo-Hwan (Department of Chemistry, Hannam University)
Choi, Seong-Ho (Department of Chemistry, Hannam University)
Publication Information
Analytical Science and Technology / v.23, no.2, 2010 , pp. 165-171 More about this Journal
Abstract
Glucose oxidase ($GOD_{ox}$) immobilized biosensor was fabricated by two methods. In one of the methods, gold nanoparticles (Au-NPs) prepared by ${\gamma}$-irradiation were loaded into the poly(maleic anhydride)-grafted multi-walled carbon nanotube, PMAn-g-MWCNT electrode via physical entrapment. In the other method, the Au-NPs were prepared by electrochemical reduction of Au ions on the surface of PMAn-g-MWCNT electrode and then GODox was immobilized into the Au-NPs. The $GOD_{ox}$ immobilized biosensors were tested for electrocatalytic activities to sense glucose. The sensing range of the biosensor based on the Au-NPs physically modified PMAn-g-MWCNT electrode was from $30\;{\mu}M$ to $100\;{\mu}M$ for the glucose concentration, and the detection limit was $15\;{\mu}M$. Interferences of ascorbic acid and uric acid were below 7.6%. The physically Au deposited PMAn-g-MWCNT paste electrodes appear to be good sensor in detecting glucose.
Keywords
maleic anhydride; MWCNT; gold nanoparticles; glucose oxidase; radiation-induced graft polymerization;
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