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Cerium phosphate nanotubes: synthesis, characterization and biosensing

机译：磷酸铈纳米管：合成，表征和生物传感

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Cerium phosphate (CeP) nanotubes have been synthesized and confirmed by x-ray diffraction (XRD) and transmission electron microscopy (TEM). The 1D nanomaterial has a monoclinic crystal structure with a mean width of 15-20 nm and a length up to several micrometers. The nanotubes have been employed as electrode substrates for immobilization and direct electrochemistry of heme proteins/enzymes with myoglobin (Mb) as a model. The electrochemical characteristics of the Mb-CeP/GC electrode were studied by voltammetry. After being immobilized on the nanotubes, Mb can keep its natural structure and undergo effective direct electron transfer reaction with a pair of well-defined redox peaks at -(367 +/- 3) mV (pH 7.5). The apparent electron transfer rate constant is (9.1 +/- 1.4) s(-1). The electrode displays good features in the electrocatalytic reduction of H2O2, and thus can be used as a biosensor for detecting the substrate with a low detection limit (0.5 +/- 0.05 mu M), a wide linear range (0.01-2 mM), high sensitivity (14.4 +/- 1.2 mu A mM(-1)), as well as good stability and reproducibility. CeP nanotubes can become a simple and effective biosensing platform for the integration of heme proteins/enzymes and electrodes, which can provide analytical access to a large group of enzymes for a wide range of bioelectrochemical applications.
机译：磷酸铈（CeP）纳米管已经合成，并通过X射线衍射（XRD）和透射电子显微镜（TEM）进行了确认。一维纳米材料具有单斜晶体结构，其平均宽度为15-20 nm，长度可达几微米。纳米管已用作电极底物，以肌红蛋白（Mb）为模型固定血红素蛋白/酶并直接进行电化学。用伏安法研究了Mb-CeP / GC电极的电化学特性。固定在纳米管上后，Mb可以保持其天然结构，并在-（367 +/- 3）mV（pH 7.5）下与一对明确定义的氧化还原峰进行有效的直接电子转移反应。表观电子传递速率常数为（9.1 +/- 1.4）s（-1）。该电极在H2O2的电催化还原中表现出良好的功能，因此可以用作检测限低（0.5 +/- 0.05μM），线性范围宽（0.01-2 mM）的底物的生物传感器。高灵敏度（14.4 +/- 1.2μAmM（-1）），以及良好的稳定性和可重复性。 CeP纳米管可以成为整合血红素蛋白/酶和电极的简单有效的生物传感平台，可以为广泛的生物电化学应用提供对大量酶的分析通道。

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