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首页> 外文期刊>Electroanalysis >Determination of phenolic antioxidants by HPLC with amperometric detection at a nickel phthalocyanine polymer modified electrode
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Determination of phenolic antioxidants by HPLC with amperometric detection at a nickel phthalocyanine polymer modified electrode

机译：高效液相色谱法在镍酞菁聚合物修饰电极上通过安培检测法测定酚类抗氧化剂

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摘要

The suitability of nickel phthalocyanine polymer-coated glassy carbon electrodes for the amperometric detection of the phenolic antioxidants tert-butylhydroxytoluene (BHT), tert-butylhydroxyanisole (BHA), propyl gallate (PG) and tert-butylhydroquinone (TBHQ), after their separation by HPLC under gradient elution conditions, is demonstrated. An applied potential of +0.70 V (vs. Ag/AgCl) was used, which offers the best signal-to-noise ratio and is considerably lower than those reported in the literature with conventional electrodes. A good separation of the four antioxidants was obtained in 17 min. Furthermore, no fouling of the electrode surface was observed when using the polymer modified electrode during the whole working day. Using TBHQ as internal standard, detection limits of 5.5 ng, 7.5 ng and 30 ng (for a 50-mu L volume injected) were obtained for BHA, PG and BHT, respectively. As an application, the determination of the antioxidants contained in commercial chewing gum samples was carried out by applying a simple extraction procedure. It was demonstrated that only BHT was present as antioxidant in the samples, in a concentration of 51 +/- 3 mu g g(-1). Sample linearity and recovery studies, after adding a known amount of BHT to the analyzed samples, confirmed the sutability of the proposed method. [References: 13]
机译：镍酞菁聚合物涂覆的玻璃碳电极在通过苯酚抗氧化剂叔丁基羟基甲苯（BHT），叔丁基羟基茴香醚（BHA），没食子酸丙酯（PG）和叔丁基对苯二酚（TBHQ）分离后可用于安培检测证明了在梯度洗脱条件下的HPLC。使用了+0.70 V（vs. Ag / AgCl）的施加电势，该电势提供了最佳的信噪比，并且大大低于文献中传统电极的电势。在17分钟内获得了四种抗氧化剂的良好分离。此外，当在整个工作日中使用聚合物改性的电极时，未观察到电极表面的结垢。使用TBHQ作为内标，对BHA，PG和BHT的检测限分别为5.5 ng，7.5 ng和30 ng（进样量为50μL）。作为应用，通过应用简单的提取程序即可测定市售口香糖样品中所含的抗氧化剂。已证明样品中仅BHT作为抗氧化剂存在，浓度为51 +/- 3μg（-1）。在向分析的样品中添加已知量的BHT后，样品的线性和回收率研究证实了该方法的可保存性。 [参考：13]

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