Analytical Division, Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi 221005, India.
Analytical Division, Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi 221005, India.
Anal Chim Acta. 2015 May 22;875:83-91. doi: 10.1016/j.aca.2015.02.009. Epub 2015 Feb 9.
A typical, reproducible, and rugged screen printed carbon electrode, modified with dual-ion imprinted beads, was fabricated employing the "surface grafting from" approach. For this, the acyl chloride functionalized magnetic nanoparticles were first immobilized and chemically attached with a typical functional monomer (but-2-enedioic acid bis-[(2-amino-ethyl)-amide]) on the electrode surface. This was subsequently subjected to the thermal polymerization in the presence of template ions (Ce(IV) and Gd(III)), cross-linker (ethylene glycol dimethacrylate), initiator (AIBN), and multiwalled carbon nanotubes. The modified sensor was used for the simultaneous analysis of both template ions in aqueous, blood serum, and waste-water samples, using differential pulse anodic stripping voltammetry which revealed two oxidation peaks for respective templates with resolution as much as 950 mV, without any cross reactivity, interferences and false-positives. The detection limits realized by the proposed sensor, under optimized conditions, were found to be as low as 0.07 ng mL(-1) for Ce(IV) and 0.19 ng mL(-1) for Gd(III) (S/N=3) that could eventually be helpful for lanthanide estimation at stringent levels.
采用“表面接枝法”制备了一种典型的、可重现的、坚固耐用的丝网印刷碳电极，并用双离子印迹珠进行了修饰。为此，首先将酰氯功能化的磁性纳米粒子固定化，并在电极表面上通过化学方法与典型的功能单体（丁烯二酸双[（2-氨基乙基）酰胺]）键合。随后，在模板离子（Ce（IV）和 Gd（III））、交联剂（乙二醇二甲基丙烯酸酯）、引发剂（AIBN）和多壁碳纳米管存在下进行热聚合。修饰后的传感器用于同时分析水溶液、血清和废水中的两种模板离子，使用差分脉冲阳极溶出伏安法，两种模板的氧化峰具有高达 950 mV 的分辨率，没有任何交叉反应、干扰和假阳性。在优化条件下，所提出的传感器的检测限低至 Ce（IV）为 0.07 ng mL（-1），Gd（III）为 0.19 ng mL（-1）（S/N=3），这最终有助于在严格的水平下估算镧系元素。
