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首页> 外文期刊>Applied Surface Science >Preparation of alanine and tyrosine functionalized graphene oxide nanoflakes and their modified carbon paste electrodes for the determination of dopamine
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Preparation of alanine and tyrosine functionalized graphene oxide nanoflakes and their modified carbon paste electrodes for the determination of dopamine

机译：丙氨酸和酪氨酸官能化氧化石墨烯纳米薄片的制备及其修饰的碳糊电极，用于测定多巴胺

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Herein, established the synthesis of graphene oxide (GO) by Hummers Method with addition of KMnO4 followed by thermal heating at 80 degrees C. The obtained GO was further functionalized by alanine and tyrosine. The prepared GO, alanine functionalized GO nanoflakes (AGONF) and tyrosine functionalized GO nanoflakes (TGONF) were characterized by spectroscopic technique using energy-dispersive spectroscopy (EDS), quantitatively by scanning electron microscopy (SEM) and structural studies along with interlayer distance verified through X-ray diffraction technique. Afterwards, the prepared AGONF and TGONF were used as the modifier for the carbon paste electrode (CPE). The electrochemical behavior of the AGONF and TGONF modified carbon paste electrodes (MCPEs) towards dopamine (DA) in phosphate buffer solution (PBS) were examined by cyclic voltammetric (CV) technique and the obtained consequences showed good electrocatalytic activity of MCPEs by increasing the redox peak current with a lower potential difference compared to the bare CPE (BCPE). The AGONF and TGONF MCPEs were further used for the optimization studies. From the pH studies, it was found that the equal number of proton and electron transfer reaction involved in both the modified electrodes. The scan rate studies demonstrate the adsorption controlled electrode process at AGONF MCPE and diffusion controlled at TGONF MCPE. The oxidation peak current increased linearly with two concentration interval of DA at a range of 2-7 mu M and 10-30 mu M in presence of PBS (pH 7.4) at MCPEs and the limit of detection (LOD) were found to be 0.84 mu M and 0.96 mu M for first interval DA concentration range (2-7 mu M) at AGONF and TGONF MCPE. The stability, repeatability and reproducibility of functionalized GO nanoflakes MCPEs at DA were studied and established excellent characteristics. The newly developed functionalized GO nanoflake electrodes were successfully tested in DA injection sample. Furthermore the functionalized GO and surfactant (Sodium Alpha Olefin Sulphonate (SAOS)) immobilized functionalized GO MCPEs were examined for simultaneous determination of DA and ascorbic acid (AA) by differential pulse voltammetric technique. (C) 2016 Elsevier B.V. All rights reserved.
机译：在此，通过添加KMnO 4，然后在80℃下加热加热，通过Hummers方法建立了氧化石墨烯（GO）的合成。将得到的GO进一步用丙氨酸和酪氨酸官能化。制备的GO，丙氨酸功能化GO纳米片（AGONF）和酪氨酸功能化GO纳米片（TGONF）通过能量色散光谱（EDS）的光谱技术进行表征，通过扫描电子显微镜（SEM）进行定量分析并通过结构研究以及层间距离进行验证X射线衍射技术。然后，将制备的AGONF和TGONF用作碳糊电极（CPE）的改性剂。通过循环伏安法（CV）检测了AGONF和TGONF修饰的碳糊电极（MCPE）对多巴胺（DA）在磷酸盐缓冲溶液（PBS）中的电化学行为，所得结果表明，通过增加氧化还原，MCPE具有良好的电催化活性。与裸CPE（BCPE）相比，峰值电流具有更低的电势差。 AGONF和TGONF MCPE进一步用于优化研究。从pH研究中发现，两个修饰电极中都包含相同数量的质子和电子转移反应。扫描速率研究表明，AGONF MCPE的吸附控制电极过程，TGONF MCPE的扩散控制过程。在MCPE处存在PBS（pH 7.4）时，氧化峰电流随DA的两个浓度间隔在2-7μM和10-30μM的范围内线性增加，并且检测极限（LOD）为0.84在AGONF和TGONF MCPE的第一间隔DA浓度范围（2-7μM）中，μM和0.96μM。研究了功能化GO纳米片MCPE在DA的稳定性，可重复性和可重复性，并建立了优异的特性。新开发的功能化GO纳米片电极已在DA注射样品中成功测试。此外，还通过差分脉冲伏安法检测了固定化的功能化GO和表面活性剂（α-烯烃磺酸钠（SAOS））固定化的功能化GO MCPE的同时测定DA和抗坏血酸（AA）的能力。 （C）2016 Elsevier B.V.保留所有权利。

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