Synthesis of La2O3/MWCNT nanocomposite as the sensing element for electrochemical determination of theophylline.,Analytical Methods

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Synthesis of La2O3/MWCNT nanocomposite as the sensing element for electrochemical determination of theophylline.
Analytical Methods ( IF 2.7 ) Pub Date : 2020-08-10 , DOI: 10.1039/d0ay01336f
Tayebeh Iranmanesh ₁ , Shohreh Jahani , Mohammad Mehdi Foroughi , Mehdi Shahidi Zandi , Hadi Hassani Nadiki

Affiliation

In this study, an electrochemical sensor was applied for the determination of theophylline, a bronchodilator drug, using differential pulse voltammetry (DPV). A glassy carbon electrode (GCE) surface was modified with the La₂O₃/MWCNT nanocomposite. The design is simplistic, efficient, greener and solvent-free microwave procedure for synthesizing La₂O₃/MWCNT nanocomposites. Fourier transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD) techniques are used to characterize the features of the La₂O₃/MWCNT nanocomposite morphology and structure. The use of the modified sensor remarkably enhanced the current density and displayed a linear response ranging between 0.1 and 400.0 μM, with a limit of detection of 0.01 μM (S/N = 3). Using optimized conditions, the modified sensor demonstrated very good stability, selectivity and improved accuracy. Acceptable outputs were achieved in the analysis of real specimens, indicating that it is possible to use the modified sensor for practical analyses.

中文翻译：

La2O3 / MWCNT纳米复合材料的合成作为电化学测定茶碱的敏感元素。

在这项研究中，使用差分脉冲伏安法（DPV）将电化学传感器应用于茶碱（一种支气管扩张药）的测定。用La ₂ O ₃ / MWCNT纳米复合材料修饰玻璃碳电极（GCE）表面。该设计简单，高效，绿色且无溶剂，可用于合成La ₂ O ₃ / MWCNT纳米复合材料。傅里叶变换红外（FT-IR）光谱，场发射扫描电子显微镜（FESEM），能量色散X射线光谱（EDX）和X射线衍射（XRD）技术用于表征La ₂ O _3的特征/ MWCNT纳米复合材料的形态和结构。使用改进的传感器可以显着提高电流密度，并显示出0.1至400.0μM的线性响应，检出限为0.01μM（S / N = 3）。在优化的条件下，改进的传感器表现出非常好的稳定性，选择性和更高的精度。在实际样品的分析中获得了可接受的输出，表明可以使用改进的传感器进行实际分析。

更新日期：2020-09-17

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