Electrochemical assay of the antioxidant ascorbyl palmitate in mixed medium

被引：9

作者：

Teneva, Olga ^{[1
]}

Dimcheva, Nina ^{[2
]}

机构：

[1] Paisij Hilendarski Univ Plovdiv, Dept Chem Technol, 24 Tsar Assen St, BG-4000 Plovdiv, Bulgaria

[2] Paisij Hilendarski Univ Plovdiv, Dept Phys Chem, 24 Tsar Assen St, BG-4000 Plovdiv, Bulgaria

来源：

FOOD CHEMISTRY | 2016年 / 203卷

关键词：

Antioxidants; Ascorbyl palmitate; Au-nanoparticles; Electrocatalysis; Electrochemistry; MODIFIED GLASSY-CARBON; GRAPHITE; NANOPARTICLES; DERIVATIVES; ELECTRODES;

D O I：

10.1016/j.foodchem.2016.02.008

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

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 mu A mM(-1) mm(-2); linearity up to 500 mu M; LOD = 5.8 mu M. Quantification of the AP content in a real sample - stabilised flaxseed oil, was performed. (c) 2016 Elsevier Ltd. All rights reserved.

引用

页码：35 / 40

页数：6

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