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Evaluation of a Carbon Ink Chemically Modified Electrode Incorporating a Copper-Neocuproine Complex for the Quantification of Antioxidants
Sensors and Actuators B: Chemical ( IF 8.4 ) Pub Date : 2020-04-05 , DOI: 10.1016/j.snb.2020.128070
Arely Cardenas , Carlos Frontana

A feasibility study on the use of a carbon ink chemically modified electrode to quantify antioxidants, containing [Cu(Nc)2](NO3)2. First, [Cu(Nc)2](NO3)2 was prepared and characterized, to demonstrate similarity with electrochemical response of CUPRAC solution. Then, the Chemically Modified Electrode (CME) was prepared with [Cu(Nc)2](NO3)2 and it was used to determine the total antioxidant content (TAC), employing Trolox, as a variation of the CUPRAC methodology in order to provide an alternative to the original methodology, which requires the preparation of several precursor solutions. CME also demonstrated reproducible results in the quantification of TAC for different antioxidants, where the anodic peak current of the cyclic voltammograms of the adsorbed [Cu(Nc)2]2+ showed a linear correlation with the antioxidant concentration. Those results resemble results obtained in CUPRAC solution, the characteristic calibration curve slopes can also be employed to determine the relative number of exchanged electrons. Analytical performance of the prepared CME referred to Trolox as probe lead to the following parameters: quantification limit of 2.10 × 10-4 mol L-1; detection limit of 6.29 × 10-5 mol L-1; and a linear range of 2.10 to 77.4 (x 10-4) mol L-1. Finally, analytical performance of this CME was also evaluated with Ascorbic Acid and Catechin as sample antioxidants. TAC determinations were performed in tea samples and the results were comparable to those obtained using the conventional spectrophotometric CUPRAC method. Obtained results suggest that this CME can be reused in consecutive determinations, as long as a previous calibration curve is prepared for the electrode on a regular basis.



中文翻译:

碳墨水化学修饰电极与铜-新铜尿烷配合物用于抗氧化剂定量的评估

使用碳墨水化学修饰的电极定量包含[Cu(Nc)2 ](NO 32的抗氧化剂的可行性研究。首先,制备并表征[Cu(Nc)2 ](NO 32,以证明其与CUPRAC溶液的电化学响应相似。然后,用[Cu(Nc)2 ](NO 32制备化学修饰电极(CME)并使用Trolox将其用于确定总抗氧化剂含量(TAC)(作为CUPRAC方法的一种变体),以便为需要准备多种前体溶液的原始方法提供替代方法。CME还证明了在不同抗氧化剂的TAC定量分析中可重复的结果,其中吸附的[Cu(Nc)2 ] 2+的循环伏安图的阳极峰值电流与抗氧化剂的浓度呈线性关系。这些结果类似于在CUPRAC溶液中获得的结果,特征校准曲线斜率也可以用于确定交换电子的相对数量。所制备的以Trolox为探针的CME的分析性能导致以下参数:定量限为2.10×10 -4 mol L -1。检出限为6.29×10 -5 mol L -1 ; 线性范围为2.10至77.4(x 10 -4)mol L -1。最后,还使用抗坏血酸和儿茶素作为抗氧化剂样品评估了该CME的分析性能。在茶样品中进行TAC测定,结果与使用常规分光光度CUPRAC方法获得的结果相当。获得的结果表明,只要定期为电极准备先前的校准曲线,即可连续使用CME。

更新日期:2020-04-06
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