This research established an electrochemical sensing platform for sensitive dopamine (DA) detection using a modified glassy carbon electrode (GCE) made from waste pineapple leaf derived porous carbon (PLPC), which was applied to DA analysis in human blood samples with the characteristics such as simple procedure, excellent anti-interference ability and low detection limit. Transmission electron microscopy revealed a layered and porous structure in the morphology of PLPC. PLPC's specific surface area and average pore size were determined to be 350.48 m²/g and 3.72 nm, respectively. The crystal phase and valence state were examined using X-ray photoelectron spectroscopy and X-ray diffraction. Using the best parameters, cyclic voltammetry and differential pulse voltammetry were applied to study the electrochemical behaviors of DA on PLPC/GCE. On PLPC/GCE a wide linear range of 0.05–500.0 μmol/L and a low detection limit of 0.0075 μmol/L for DA detection could be realized. The recoveries of DA were 97.67–102.07 % for detection of human blood sample with excellent stability, reproducibility and repeatability. Therefore the waste pineapple leaf based biomass porous carbon could be used as promising potential candidate for sensing application.

中文翻译：

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菠萝叶多孔碳修饰电极电化学检测多巴胺

本研究利用废弃菠萝叶衍生多孔碳（PLPC）制成的改性玻碳电极（GCE）建立了灵敏检测多巴胺（DA）的电化学传感平台，应用于人体血液样本中的DA分析，具有以下特点：操作流程简单，抗干扰能力强，检出限低。透射电子显微镜显示 PLPC 的形态具有层状和多孔结构。 PLPC的比表面积和平均孔径分别测定为350.48m ² /g和3.72nm。使用X射线光电子能谱和X射线衍射检查晶相和价态。采用最佳参数，采用循环伏安法和微分脉冲伏安法研究DA在PLPC/GCE上的电化学行为。在 PLPC/GCE 上，DA 检测可实现 0.05–500.0 μmol/L 的宽线性范围和 0.0075 μmol/L 的低检测限。 DA检测人体血液样本的回收率为97.67%~102.07%，具有良好的稳定性、重现性和重复性。因此，基于废弃菠萝叶的生物质多孔碳可作为传感应用的有前景的潜在候选者。