M. Bagherzadeh, S. Ansari, Fariborz Riahi, A. Farahbakhsh
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引用次数: 15
摘要
本文合成了Fe3O4磁性纳米颗粒(MNPs)并对其进行了表征。然后，通过在MCPE (MCPE/MNP)上浇铸和干燥MNPs，用MNPs修饰磁性碳糊电极(MCPE)。以[Fe(CN)6]3−/4−为氧化还原探针，采用循环伏安法研究了MCPE/MNP的电化学行为，并对MNPs的表面进行了评价。用电化学方法研究了MCPE/MNP对多巴胺(DA)和抗坏血酸(AA)的吸附行为，结果表明MCPE/MNP只对DA有吸附行为。基于这种行为，将DA分子预先浓缩在MCPE/MNP上，然后在无DA溶液中剥离。经实验和仪器优化，得到了M - AA存在时，DL = M - DA, RSD = 4.6%的校准曲线。MCPE/MNP的性能在药物样品中成功测试。
A Dopamine Sensor Based on Pre-Concentration by Magnetic Nanoparticles
Herein, Fe3O4 magnetic nanoparticles (MNPs) were synthesized and characterized. Afterward, a magnetic carbon paste electrode (MCPE) was modified with MNPs via casting and drying MNPs on top of the MCPE (MCPE/MNP). Electrochemical behavior of the MCPE/MNP was studied by cyclic voltammetry in the presence of [Fe(CN)6]3−/4− as a redox probe, and surface of MNPs was evaluated as . The behavior of MCPE/MNP towards dopamine (DA) and ascorbic acid (AA) has been investigated by electrochemical methods, and the obtained results showed that the MCPE/MNP has adsorption behavior towards only DA. Based on this behavior, the DA molecules were pre-concentrated on top of the MCPE/MNP and followed with stripping in DA free solution. Subsequent to experimental and instrumental optimization, a calibration curve from to M DA with , DL = M DA, and RSD = 4.6%, was obtained in the presence of M AA. Performance of the MCPE/MNP was successfully tested in a pharmaceutical sample.
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