The use of nanostructured materials is already well-known as a powerful tool in the development of electrochemical sensors. Among several immobilization strategies of nanomaterials in the development of electrochemical sensors, the use of low-cost and environmentally friendly polymeric materials is highlighted. In this context, a new nanostructured biocomposite electrode is proposed as an electrochemical sensor for the analysis and determination of tetracycline. The composite electrode consists of a modified glassy carbon electrode (GCE) with a nanodiamond-based (ND) and manioc starch biofilm (MS), called ND-MS/GCE. The proposed sensor showed better electrochemical performance in the presence of tetracycline in comparison to the unmodified electrode, which was attributed to the increase in the electroactive surface area due to the presence of nanodiamonds. A linear dynamic range from to  mol L⁻¹ and a limit of detection of  mol L⁻¹ were obtained for the proposed sensor. ND-MS/GCE exhibited high repeatability and reproducibility for successive measurements with a relative standard deviation (RSD) of 6.3% and 1.5%, respectively. The proposed electrode was successfully applied for the detection of tetracycline in different kinds of water samples, presenting recoveries ranging from 86 to 112%.

中文翻译：

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基于纳米金刚石和木薯淀粉的电化学传感器检测四环素

纳米结构材料的使用已经众所周知，它是电化学传感器开发中的强大工具。在电化学传感器的发展中，纳米材料的几种固定化策略中，强调了低成本和环保聚合物材料的使用。在这种情况下，提出了一种新的纳米结构生物复合电极作为电化学传感器，用于分析和测定四环素。复合电极由具有纳米金刚石基（ND）和木薯淀粉生物膜（MS）的改性玻碳电极（GCE）组成，称为ND-MS / GCE。与未修饰的电极相比，拟议的传感器在四环素存在下显示出更好的电化学性能，这归因于纳米金刚石的存在导致电活性表面积的增加。线性动态范围从 到  mol L ^-1和检测限对于所提出的传感器获得了 mol L ^-1。ND-MS / GCE在连续测量中表现出很高的可重复性和可重复性，相对标准偏差（RSD）分别为6.3％和1.5％。所提出的电极已成功应用于不同种类水样中四环素的检测，回收率在86％至112％之间。