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• W2328897230 abstract "Abstract A highly sensitive electrochemical sensor was fabricated by electropolymerizing p-aminobenzene sulfonic acid (ABSA) on quaternary amine functionalized multi-wall carbon nanotubes (Q-MWNTs) modified glassy carbon electrode (GCE). Q-MWNTs provide a conductive and stable network for the poly-ABSA (PABSA) immobilization. The voltammetric behaviors of methotrexate (MTX) and calcium folinate (CF) at the PABSA/Q-MWNTs/GCE were investigated by cyclic voltammetry (CV). Compared with bare GCE, Q-MWNTs/GCE and PABSA/GCE, the PABSA/Q-MWNTs/GCE exhibited excellent electrocatalytic oxidation toward MTX and CF. Separation of the oxidation peak potentials for MTX and CF was 0.26 V in phosphate buffer solution (pH 7.0), which made it suitable for simultaneous determination of these two compounds by differential pulse voltammetry (DPV). Under the optimized conditions, the anodic peak current of MTX was linear with the concentration from 0.1 to 8.0 μM in the presence of 8.0 μM CF, with a detection limit of 0.015 μM (S/N = 3). At the same time, the anodic current of CF was linear with the concentration from 0.1 to 6.5 μM with a detection limit of 0.020 μM in the presence of 8.0 μM MTX. The proposed sensor showed advantages of simple preparation, high sensitivity, good reproducibility and stability. It was successfully applied to simultaneous determination of MTX and CF in urine samples." @default.
• W2328897230 created "2016-06-24" @default.
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• W2328897230 date "2013-11-01" @default.
• W2328897230 modified "2023-10-16" @default.
• W2328897230 title "Simultaneous determination of methotrexate and calcium folinate with electrochemical method based on a poly-ABSA/functionalized MWNTs composite film modified electrode" @default.
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• W2328897230 doi "https://doi.org/10.1016/j.jelechem.2013.09.004" @default.
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