Institute of Chemistry, São Paulo State University (UNESP), 14800-060 Araraquara, São Paulo, Brazil; Bioenergy Research Institute, São Paulo State University (UNESP), 14800-060 Araraquara, São Paulo, Brazil.
Institute of Chemistry, São Paulo State University (UNESP), 14800-060 Araraquara, São Paulo, Brazil; Bioenergy Research Institute, São Paulo State University (UNESP), 14800-060 Araraquara, São Paulo, Brazil.
Food Chem. 2022 Dec 15;397:133786. doi: 10.1016/j.foodchem.2022.133786. Epub 2022 Jul 29.
This work reports the development and application of a disposable electrochemical platform for vanillic acid (VA) detection using screen-printed electrode modified with reduced graphene oxide, iron nanoparticles and molecularly imprinted poly(pyrrole) film. The electrochemical platform was characterized by cyclic voltammetry, electrochemical impedance spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. Using optimized conditions, the proposed disposable platform presented linear concentration ranges of 1.0 × 10 to 1.5 × 10 mol/L. The limits of detection and quantification obtained for the device were 3.1 × 10 and 1.0 × 10 mol/L, respectively. The electrochemical platform was found to be selective for VA recognition and presented voltammetric responses with good repeatability and stability. The analytical methodology developed was applied for VA determination in banana and orange peels. The results obtained showed that the proposed electrochemical platform has a good accuracy when applied for the determination of VA.
本工作报道了一种使用还原氧化石墨烯、铁纳米粒子和分子印迹聚吡咯薄膜修饰的丝网印刷电极制备用于香草酸 (VA) 检测的一次性电化学平台的开发和应用。通过循环伏安法、电化学阻抗谱、扫描电子显微镜、能量色散 X 射线光谱和 X 射线光电子能谱对电化学平台进行了表征。在优化条件下，所提出的一次性平台呈现出 1.0×10 至 1.5×10 mol/L 的线性浓度范围。该装置的检测限和定量限分别为 3.1×10 和 1.0×10 mol/L。发现电化学平台对 VA 识别具有选择性，并呈现出具有良好重现性和稳定性的伏安响应。所开发的分析方法用于香蕉和橙皮中 VA 的测定。所得结果表明，所提出的电化学平台在用于 VA 测定时具有良好的准确性。
