Details

Autor(en) / Beteiligte

• Carolina Torres, A.
• Barsan, Madalina M.
• Brett, Christopher M.A.

Titel

Simple electrochemical sensor for caffeine based on carbon and Nafion-modified carbon electrodes

Ist Teil von

• Food chemistry, 2014-04, Vol.149, p.215-220

Ort / Verlag

Kidlington: Elsevier Ltd

Erscheinungsjahr

2014

Quelle

MEDLINE

Beschreibungen/Notizen

• •Simple electrochemical sensor for caffeine, superior to more complex sensor platforms.•Electrode modification strategies and analysis medium optimised.•Sensor based on bare or Nafion-modified glassy carbon gives best results.•Successful interference-free application to beverages and drugs. A simple, economic, highly sensitive and highly selective method for the detection of caffeine has been developed at bare and Nafion-modified glassy carbon electrodes (GCE). The electrochemical behaviour of caffeine was examined in electrolyte solutions of phosphate buffer saline, sodium perchlorate, and in choline chloride plus oxalic acid, using analytical determinations by fixed potential amperometry, phosphate buffer saline being the best. Modifications of the GCE surface with poly(3,4-ethylenedioxythiophene) (PEDOT), Nafion, and multi-walled carbon nanotubes were tested in order to evaluate possible sensor performance enhancements, Nafion giving the most satisfactory results. The effect of interfering compounds usually found in samples containing caffeine was examined at GCE without and with Nafion coating, to exclude interferences, and the sensors were successfully applied to determine the caffeine content in commercial beverages and drugs.