Determination of Caffeine at a Nafion-Covered Glassy Carbon Electrode

✍ Scribed by Barbara Brunetti; Elio Desimoni; Paolo Casati

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 65 KB
• Volume: 19
• Category: Article
• ISSN: 1040-0397
• DOI: 10.1002/elan.200603679

✦ Synopsis

Abstract

A simple differential pulse voltammetric method based on a Nafion‐covered glassy carbon electrode was developed for the quantitative determination of caffeine in cola beverages. The modified electrode exhibits a clear improvement of the current response compared to that observed at a bare glassy carbon electrode. The method allows quantifying the analyte in the 9.95×10^−7^–1.06×10^−5^ M range, with a detection limit of 7.98×10^−7^ M in 0.1 M sulfuric acid solutions. The developed procedure was tested by recovery studies. The results are described and discussed in the light of the existing literature.