Amperometric sensor for L-ascorbic acid determination based on MnO2 bulk modified screen printed electrode |
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Authors: | Turkusic E Milicevic V Tahmiscija H Vehabovic M Basic S Amidzic V |
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Affiliation: | Department of Chemistry, Faculty of Science, University of Sarajevo, Bosnia and Herzegovina. |
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Abstract: | A simple biosensor constructed by bulk-modification of carbon ink with manganese dioxide as a mediator was investigated for its ability to serve as amperometric detector for L-ascorbic acid in hydrodynamic mode. The sensor could be operated at pH 5.0 (0.05 M phosphate buffer) and exhibited excellent reproducibility and stability. Optimization of measurement parameters such as applied working potential and pH value were studied in detail. The screen printed electrode exhibited a linear amperometric increase with the concentration of L-ascorbic acid from 50 mg L(-1) to 250 mg L(-1) and gave a (LOD = 3sigma) detection limit of 0.2 mg L(-1) (1.172 micromol L(-1)). The manganese dioxide modified screen printed electrode shows long term stability. |
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