1. Electrochemical assay of the antioxidant ascorbyl palmitate in mixed medium.
- Author
-
Teneva O and Dimcheva N
- Subjects
- Ascorbic Acid analysis, Electrochemical Techniques instrumentation, Electrodes, Linseed Oil chemistry, Oxidation-Reduction, Antioxidants analysis, Ascorbic Acid analogs & derivatives, Electrochemical Techniques methods, Gold chemistry, Graphite chemistry, Metal Nanoparticles chemistry
- Abstract
Electrooxidation of ascorbyl palmitate (AP) over gold screen-printed electrode (AuSPE) and gold nanoparticles modified graphite (AuNPs/gr) was examined in mixed water-alcohol medium. Voltammetric and amperometric studies showed that: (i) AP oxidation on the AuSPE proceeds at higher potential than on AuNPs/gr; (ii) the current density on AuNPs/gr was 2.4 times higher than on AuSPE; (iii) the linear dynamic range for AuNPs/gr doubled that for AuSPE. At the optimal for AuNPs/gr operating potential (250 mV) the following operational parameters were determined: sensitivity 1.627 ± 0.138 μA mM(-1) mm(-2); linearity up to 500 μM; LOD=5.8 μM. Quantification of the AP content in a real sample - stabilised flaxseed oil, was performed., (Copyright © 2016 Elsevier Ltd. All rights reserved.)
- Published
- 2016
- Full Text
- View/download PDF