混合介质中抗氧剂棕榈酸抗坏血酸的电化学测定。
Electrochemical assay of the antioxidant ascorbyl palmitate in mixed medium.
机构信息
Department of Chemical Technology, Plovdiv University, 24, Tsar Assen St., BG-4000 Plovdiv, Bulgaria.
Department of Physical Chemistry, Plovdiv University, 24, Tsar Assen St., BG-4000 Plovdiv, Bulgaria.
出版信息
Food Chem. 2016 Jul 15;203:35-40. doi: 10.1016/j.foodchem.2016.02.008. Epub 2016 Feb 2.
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.
在水-醇混合介质中，研究了金丝网印刷电极（AuSPE）和金纳米粒子修饰石墨（AuNPs/gr）上抗坏血酸棕榈酸酯（AP）的电化学氧化。伏安法和安培法研究表明：（i）AP 在 AuSPE 上的氧化电位高于 AuNPs/gr；（ii）AuNPs/gr 的电流密度比 AuSPE 高 2.4 倍；（iii）AuNPs/gr 的线性动态范围是 AuSPE 的两倍。在 AuNPs/gr 的最佳工作电位（250 mV）下，确定了以下操作参数：灵敏度 1.627 ± 0.138 μA mM(-1) mm(-2)；线性度高达 500 μM；LOD=5.8 μM。对稳定的亚麻籽油等实际样品中的 AP 含量进行了定量分析。
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