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Preparation and Electrocatalytic Study of Myoglobin Biosensor Based on Platinum-Gold-Three Dimensional Graphene Modified Electrode

机译:基于铂金三维石墨烯改性电极的肌红蛋白生物传感器的制备与电催化研究

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An electrochemical biosensor was prepared by using platinum-gold-three dimensional graphene (PtAu-3DGR) and myoglobin (Mb) with ionic liquid N-hexylpyridinium hexafluorophosphate modified carbon paste electrode (CILE) as the base electrode. The mixed materials of Pt-Au-3DGR and Mb were modified on the electrode to obtain the electrochemical biosensor (Nafion/Mb/Pt-Au- 3DGR/CILE). The synthesized Pt-Au-3DGR was characterized by scanning electron microscopy and transmission electron microscopy, which showed a three-dimensional cobweb structure of GR with PtAu bimetal successfully loaded on its structure. The biostructure of Mb was analyzed by UV-Vis spectroscopy and infrared spectroscopy. Direct electrochemistry and electrocatalytic behaviors of this biosensor were tested by cyclic voltammetry and electrochemical impedance spectroscopy, which were further compared with the control group. The results prove that Nafion/Mb/Pt-Au-3DGR/CILE has obvious electrocatalytic functions to trichloroacetic acid (TCA) and sodium nitrite (NaNO2). The linear ranges for TCA and NaNO2 are 1.0-30.0 mmol L-1 and 0.05-0.55 mmol L-1 with the detection limits as 0.33 mmol L-1 and 0.01 mmol L-1, respectively.
机译:通过使用铂 - 金 - 三维石墨烯(PTAU-3DGR)和肌红蛋白(MB)与离子液体N-己基吡啶鎓六氟磷酸盐改性碳浆料电极(Cile)作为基极来制备电化学生物传感器。在电极上修饰Pt-Au-3dgR和Mb的混合材料以获得电化学生物传感器(Nafion / MB / Pt-Au-3dgr / Cile)。通过扫描电子显微镜和透射电子显微镜,其特征在于扫描电子显微镜和透射电子显微镜的特征在于,在其结构上成功地装载了PTAU双金属的GR的三维蜘蛛网结构。通过UV-Vis光谱和红外光谱分析MB的生物结构。通过循环伏安法和电化学阻抗光谱测试这种生物传感器的直接电化学和电催化行为,与对照组进一步比较。结果证明,Nafion / MB / Pt-Au-3dgr / Cile对三氯乙酸(TCA)和亚硝酸钠(Nano2)具有明显的电催化作用。 TCA和NaNO2的线性范围分别为1.0-30.0mmol L-1和0.05-0.55mmol L-1,检测限值分别为0.33mmol L-1和0.01mmol L-1。

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