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Amperometric sensor for L-ascorbic acid determination based on MnO2 bulk modified screen printed electrode.

E Turkusic·V Milicevic·H Tahmiscija·M Vehabovic·S Basic·V Amidzic
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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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Ascorbic AcidBiosensing TechniquesCalibrationCarbonElectrochemistryElectrodesManganese CompoundsOxidation-ReductionOxidesSensitivity and SpecificityJournal ArticleResearch Support, Non-U.S. Gov't

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E Turkusic, V Milicevic, H Tahmiscija, M Vehabovic, S Basic, V Amidzic. 2000. Amperometric sensor for L-ascorbic acid determination based on MnO2 bulk modified screen printed electrode.. https://doi.org/10.1007/s002160000487

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