Analytical Sciences

Abstract − Analytical Sciences, 32(8), 847 (2016).

Development of Sensitive Analytical Approach for the Quantification of α-Lipoic Acid Using Boron Doped Diamond Electrode
Dalibor M. STANKOVIC,* Eda MEHMETI,** and Kurt KALCHER**
*Innovation Center of the Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, Belgrade
**Institute of Chemistry—Analytical Chemistry, Karl-Franzens University Graz, A-8010 Graz, Austria
A boron doped diamond (BDD) electrode was investigated for use as an electrochemical sensor for α-lipoic acid (LA) using amperometric and differential pulse voltammetric detection. LA displays a well expressed oxidation peak at +0.9 V vs. Ag/AgCl in solutions with a pH value of 3. It was found that signals obtained are linearly related to the concentration range from 0.3 to 105 μM with detection limit of 0.088 μM. Interferences by common compounds such as ascorbic acid, uric acid and dopamine were tested and the method was successfully applied to the determination of LA in human body fluids where it gave recoveries in the range from 95 to 97%.