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    A2BO4±? as New Materials for Electrocatalytic Detection of Paracetamol and Diclofenac Drugs
    (Springer, 2022) Zine, Amel; Ferkhi, Mosbah; Khaled, Ammar; Savan, Ebru Kuyumcu
    In this study, the electrochemical detection of drugs in the human body such as paracetamol and diclofenac was performed using the La2NiO4/carbon black and Pr2NiO4/carbon black electrocatalysts as sensor. The oxide materials were synthesized by the citrate method. The crystallinity of materials was determined by X-ray diffraction; the cell parameters and the crystallite size were calculated using the Debye-Scherrer formula. Morphology and grain size were determined by scanning electron microscope and the pore size was determined by the BET analysis. X-ray photoelectron spectroscopy analysis was used to evaluate the surface state of the synthesized oxide powders. Electrochemical characterization of the drugs on the electrocatalysts was carried out by cyclic voltammetry at different scanning speeds in a range of drug concentrations between 3 and 200 mu mol in a phosphate-buffered saline solution at pH 7. The square wave method was used to determine the detection limits. The synthesized nano-particle-based electrodes demonstrated excellent sensitivity in detecting drug/biomolecules (PCM and DIC) in biological fluids with the minimum detection limit 1.99 mu M and 2.32 mu M, respectively, at La2NiO4/carbon black electrode and 2.04 mu M and 2.37 mu M, respectively, at Pr2NiO4/carbon black electrode. The peak currents relative to the detection of the paracetamol and diclofenac drugs are respectively 800 and 1000 on La2NiO4/carbon black and 1000 and 500 mu A on Pr2NiO4/carbon black. This remarkable behavior enables us to propose these materials as alternative electrocatalysts that act as selective sensors for drug detection in the human body.
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    Electrochemical Bio-Monitoring of the Analgesic Drug Paracetamol, the Antipsychotic Sulpiride, and the Antibiotic Bromhexine Hydrochloride Using Modified Carbon Paste Electrode Based on Ca 0.7 La 0.3 Fe 0.3 Ni 0.7 O 3 Nano-Sized Particles and Black Carbon
    (Elsevier, 2024) Mekersi, Mouna; Ferkhi, Mosbah; Khaled, Ammar; Maouche, Naima; Foudia, Malika; Savan, Ebru Kuyumcu
    Drug biomonitoring using developed modified sensors, especially with recent electrochemical techniques, is considered an essential step and plays a significant role in the good detection of several drugs in biofluids, minimizing the damages resulting from their overdoses. This work is based on the detection of three important drugs such as paracetamol (PCM), sulpiride (Sulp), and bromhexine hydrochloride (Brh-HCl) with different pharmaceutical families. A specific sensor was fabricated called the carbon paste electrode (CPE) based on Ca 0.7 La 0.3 Fe 0.3 Ni 0.7 O 3 (CLFN) nanoparticles (NPs) synthesized by a citrate method and modified with black carbon (BC). A low-cost, highly sensitive BC/CLFN NPs/CPE sensor was prepared for the simultaneous determination of the three drugs using cyclic voltammetry (CV), differential pulse voltammetry (DPV), square wave voltammetry (SWV) and electrochemical impedance spectroscopy (EIS). Physicochemical characterization was conducted using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The calculated crystallite size using the Debye-Scherer equation was 237.08 nm by XRD, while the nanoparticles grain size was 60.27 nm extracted from SEM surface images. As a result, the developed sensor demonstrates a high response and sensitivity towards PCM, Sulp, and Brh-HCl molecules compared to literature with excellent and low detection limits of 0.36 mu M, 0.042 mu M, and 2.88 mu M for PCM, 0.073 mu M, 0.12 mu M, 15.45 mu M for Sulp, and 0.407 mu M, 0.17 mu M, 7.82 mu M for Brh-HCl drug by CV, DPV and SWV techniques, respectively. High sensitivities of 6588.07, 149.73, and 83.35 mu A. mu M- 1 .cm- 2 for PCM, Sulp, and Brh by CV technique, respectively with wide linear range from 0.01 mu M to 180 mu M for PCM, from 0.1 mu M to 160 mu M for Sulp, and from 0.5 mu M to 240 mu M for Brh by DPV technique. Additionally, the modified CLFN NPs/BC/CPE sensor demonstrated excellent results in real pharmaceutical samples for all three drugs. The reported results include very good recoveries of 104.21 %, 98.68 %, and 95.50 %, and excellent relative standard deviations of 1.18 %, 1.52 %, and 2.84 %, respectively.
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    Electrochemical biodetection of glucose using La0.6Sr0.4Co0.8Fe0.2O3 and La1,7Sr0,3CuO4 NanoParticles modified with black carbon deposited on glassy carbon electrode
    (Elsevier, 2023) Mekersi, Mouna; Ferkhi, Mosbah; Savan, Ebru Kuyumcu
    Non-enzymatic developed biosensors, especially with noble nanoparticles received tremendous attention in the field of glucose molecule sensing. Herein low-cost, highly sensitive, and more effective nano-sized materials such as La1,7Sr0,3CuO4 and La0.6Sr0.4Co0.8Fe0.2O3 were synthesized by a simple citrate method, and modified with black carbon in purpose to use as electrodes for the simultaneous detection of glucose. The crystallite size, refinement, purity, shape, and morphology of nanomaterials were characterized using X-ray diffraction and Scanning Electron Microscopy techniques. Cyclic voltammetry, Differential Potential Voltammetry, Square Wave Voltammetry, and Electrochemical Impedance Spectroscopy techniques were used as investigative techniques. The modified electrodes showed excellent response and sensitivity for glucose molecule detection compared with previous literature, with a wide linear range from 0.1 M to 0.1 nM for La0.6Sr0.4Co0.8Fe0.2O3 and 0.1 M to 0.001 nM for La1,7Sr0,3CuO4, high sensitivities of 614.7 and 876.3 mu A.mM- 1.cm 2 and low detection limits of 0.972 nM and 0.0194 nM respectively. The performance of electrodes was checked by using real samples like synthetic urine and human blood. Both of the modified electrodes demonstrated satisfactory and reproducible results in real samples.
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    Electrochemical simultaneous determination of nitrate ions in water using modified glassy carbon electrode based on La1.7Sr0.3CuO4 and La0.6Sr0.4Co0.8Fe0.2O3 nanomaterials and black carbon sensors
    (Springer Heidelberg, 2024) Mekersi, Mouna; Savan, Ebru Kuyumcu; Ferkhi, Mosbah
    Nanoparticle-based materials have played an important role in the development of new electrochemical sensors and received recently tremendous attention for the detection of toxic ions such as nitrate molecules (NO3- and NO2-). Here, we employ La1.7Sr0.3CuO4 (LSCu) and La0.6Sr0.4Co0.8Fe0.2O3 (LSCF) low-cost, highly sensitive nanoparticles modified with black carbon as sensors for the detection of nitrate ions. The modified nanooxides were synthesized by a simple citrate method then prepared with black carbon powder and nafion solution as a sensing matrix on a glassy carbon electrode for the determination of nitrates ions in water using cyclic voltammetry, differential pulse voltammetry, and electrochemical impedance spectroscopy as electrochemical techniques. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used for structural and morphological characterization. The calculated crystallite size d, using the Debye-Scherrer equation was found to be 325,193 nm for LSCu and 208,317 nm for LSCF by XRD technique. The grain sizes are, respectively, 47.80 nm and 65.05 nm which were extracted by SEM analysis. In this work, the modified sensors based on LSCu and LSCF demonstrate satisfactory response and sensitivities toward nitrate molecules compared with previous works. They characterized with very low detection limits of 0.0014 nM and 0.02 nM, high sensitivities of 58.8 and 57.3 mu A.mu M-1, respectively, and recorded a wide linear range from 1 M to 10(-12) M for LSCF and 4 M to 10(-13) M for LSCu. Both of the modified electrodes demonstrated excellent results in real river water sample with low detection limits of 3.1 nM for LSCu and 3.5 nM for LSCF and very good recoveries of 100.6% and 101.65%, respectively.
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    Electrochemical Study of the Interaction Between Urea and Hydroquinone, and Detection of Urea Using CoFe2O4 Nanoparticles Modified with Gelatin-Hydroquinone Deposited on the Glassy Carbon Electrode
    (Univ Tehran, Fac Chemistry, Center Excellence Electrochemistry, 2025) Djerafa, Moussa; Ferkhi, Mosbah; Savan, Ebru Kuyumcu; Khelili, Smail
    An advanced electrochemical biosensor has been developed to measure the amount of urea in biological fluids accurately using CoFe2O4 nanoparticles modified with Gelatinhydroquinone deposited on the glassy carbon electrode. This sensor uses cobalt ferrite as a core material that has been analysed using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The sensor has a Gelatin-hydroquinone layer that allows it to detect urea at trace levels. in this study, it has been confirmed that the electrochemical method using this modified electrode is significantly more sensitive than the UV-visible method. The limit of detection (LOD) obtained utilizing the modified Berthelot reaction was 6.66 mM, while the LOD obtained using CV at the CFO/Gelatin-hydroquinone modified GCE was 0.52 mM. This confirms that the electrochemical method using this modified electrode is significantly more sensitive than the UV-visible method. The CFO/Gelatin-hydroquinone composite material effectively acted as an efficient electrocatalyst for the oxidation of urea and other molecules.