Electrochemical assay of the antioxidant ascorbyl palmitate in mixed medium

Food Chem. 2016 Jul 15:203:35-40. doi: 10.1016/j.foodchem.2016.02.008. Epub 2016 Feb 2.

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.

Keywords: Antioxidants; Ascorbyl palmitate; Au-nanoparticles; Electrocatalysis; Electrochemistry.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antioxidants / analysis*
  • Ascorbic Acid / analogs & derivatives*
  • Ascorbic Acid / analysis
  • Electrochemical Techniques / instrumentation
  • Electrochemical Techniques / methods*
  • Electrodes
  • Gold / chemistry*
  • Graphite / chemistry*
  • Linseed Oil / chemistry
  • Metal Nanoparticles / chemistry*
  • Oxidation-Reduction

Substances

  • Antioxidants
  • Gold
  • Graphite
  • Linseed Oil
  • Ascorbic Acid
  • 6-O-palmitoylascorbic acid