Facile fabrication of a novel disposable pencil graphite electrode for simultaneous determination of promising immunosuppressant drugs mycophenolate mofetil and tacrolimus in human biological fluids

Simultaneous electrochemical detection of azithromycin and hydroxychloroquine based on VS2 QDs embedded N, S @graphene aerogel/cCNTs 3D nanostructure

“…Upon increasing the potential scan rate, the anodic peak currents (Ipa) was increased with shift the oxidation potential to more positive values. The relationship between log Ipc (μA) and log ν (mV s − 1 ) can be expressed by the following equations: Ipa (μA) = 0.218 log ν (mVs − 1 ) + 87.47 (R 2 = 0.9951) and Ipa (μA) = 0.211 log ν (mVs − 1 ) + 80.07 (R 2 = 0.9959) for AZM and HCQ, respectively [49,50].…”

Electroanalytical Determination of Ziram by Differential Pulse Voltammetry with Reduced Graphene Oxide/Gold Nanoparticles Modified Glassy Carbon Electrode

“…The formulas (3 × s/m) and (10 × s/m) were used to calculate the method's limit of detection (LOD) and limit of quantification (LOQ). 54 Where s denotes the measurement's standard deviation and m denotes the calibration curve's slope (or the sensitivity).…”

Simultaneous Trace Electrochemical Determination of Xanthine Theophylline and Theobromine with a Novel Sensor Based on a Composite Including Metal Oxide Nanoparticle Multi‐walled Carbon Nanotube and Nano‐Na‐montmorillonite Clay

“…Under the optimized conditions, the relation between the concentrations vs. anodic peak currents of three biomolecules was simultaneously investigated with the NiO/ MWCNT/NNaM/PGE electrochemical sensor using the sensitive DPV method in BR buffer solution (pH: 2.0) (Figure 3A). The linearity between anodic peak current vs. concentration for XT, TP, and TB are displayed in equations below; [21], respectively. Herein, s is the standard deviation of the sample and m is the slope of the calibration curve, or in other words, the sensitivity.…”

“…Glassy carbon [15] and carbon paste electrodes [16], boron-doped diamond electrodes [17], as well as screenprinted electrodes [18] have been widely using as electrochemical sensor platforms. Pencil graphite electrodes (PGEs) are unique electrochemical sensors due to their low cost, disposability, and commercial availability in stationeries [19][20][21]. PGEs enable to enhance the sensitivity towards the biomolecule sensing with a simple modification process involving immobilization of the modifiers to the electrode surface and transferring their physicochemical properties to this surface [13,22,23].…”