Application of Different Carbon Materials for Carbon Paste Electrodes to Simultaneous Electrochemical Detection of four DNA Bases with High Simpleness

2018 ◽  
Vol 30 (8) ◽  
pp. 1723-1733 ◽  
Author(s):  
Xiaping Zhu ◽  
Yali Yuan ◽  
Yun Zhang ◽  
Jianping Li ◽  
Hongcheng Pan
Keyword(s):  
Electrochemical Detection ◽  
Carbon Materials ◽  
Dna Bases ◽  
Carbon Paste ◽  
Carbon Paste Electrodes

scholarly journals Studies on Carbon Materials Produced from Salts with Anions Containing Carbon Atoms for Carbon Paste Electrode

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2480
Author(s):  
Katarzyna Skrzypczyńska ◽  
Andrzej Świątkowski ◽  
Ryszard Diduszko ◽  
Lidia Dąbek
Keyword(s):  
Carbon Materials ◽  
Ammonium Oxalate ◽  
Differential Pulse ◽  
Degree Of Crystallinity ◽  
Carbon Paste ◽  
Turbostratic Carbon ◽  
Carbon Paste Electrodes ◽  
Structure Surface ◽  
Paste Electrode ◽  
Graphene Material

In the presented work, the properties of carbon materials obtained in the reaction of sodium bicarbonate (C–SB) and ammonium oxalate (C–AO) with magnesium by combustion synthesis were investigated. For the materials obtained in this way, the influence of the type of precursor on their properties was analyzed, including: Degree of crystallinity, porous structure, surface topography, and electrochemical properties. It has been shown that the products obtained in magnesiothermic process were found to contain largely the turbostratic carbon forming a petal-like graphene material. Both materials were used as modifiers of carbon paste electrodes, which were then used to determine the concentration of chlorophenol solutions by voltammetric method. It was shown that the peak current determined from the registered differential pulse voltammograms was mainly influenced by the volume of mesopores and the adsorption capacity of 4-chlorophenol for both obtained carbons.

Electrochemical detection of thiocyanate using phosphate-modified zeolite carbon paste electrodes

2017 ◽  
Vol 72 ◽  
pp. 236-243 ◽  
Author(s):  
A. Idris ◽  
Tawfik A. Saleh ◽  
M.A. Sanhoob ◽  
O. Muraza ◽  
Abdul-Rahman Al-Betar
Keyword(s):  
Electrochemical Detection ◽  
Carbon Paste ◽  
Modified Zeolite ◽  
Carbon Paste Electrodes

scholarly journals Influence of Nitrogen-Doped Carbon Dot and Silver Nanoparticle Modified Carbon Paste Electrodes on the Potentiometric Determination of Tobramycin Sulfate: A Comparative Study

Chemosensors ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 52
Author(s):  
Nermine V. Fares ◽  
Passant M. Medhat ◽  
Christine M. El Maraghy ◽  
Sherif Okeil ◽  
Miriam F. Ayad
Keyword(s):  
Silver Nanoparticle ◽  
Carbon Nanodots ◽  
Carbon Paste ◽  
X Ray Diffraction ◽  
Loteprednol Etabonate ◽  
Carbon Paste Electrodes ◽  
Transmission Electron ◽  
Nernstian Slope ◽  
Nitrogen Doped Carbon ◽  
Modified Carbon Paste Electrodes

Two inexpensive and simple methods for synthesis of carbon nanodots were applied and compared to each other, namely a hydrothermal and microwave-assisted method. The synthesized carbon nanodots were characterized using transmission electron microscopy (TEM), ultraviolet-visible (UV-Vis), photoluminescence (PL), Fourier transform-infrared spectroscopy (FTIR), and X-ray diffraction (XRD). The synthesized microwave carbon nanodots had smaller particle size and were thus chosen for better electrochemical performance. Therefore, they were used for our modification process. The proposed electrodes performance characteristics were evaluated according to the IUPAC guidelines, showing linear response in the concentration range 10−6–10−2, 10−7–10−2, and 10−8–10−2 M of tobramycin with a Nernstian slope of 52.60, 58.34, and 57.32 mV/decade for the bare, silver nanoparticle and carbon nanodots modified carbon paste electrodes, respectively. This developed potentiometric method was used for quantification of tobramycin in its co-formulated dosage form and spiked human plasma with good recovery percentages and without interference of the co-formulated drug loteprednol etabonate and excipients.

scholarly journals Polyvinyl Chloride Modified Carbon Paste Electrodes for Sensitive Determination of Levofloxacin Drug in Serum, Urine, and Pharmaceutical Formulations

Sensors ◽  
2021 ◽  
Vol 21 (9) ◽  
pp. 3150
Author(s):  
Fatehy M. Abdel-Haleem ◽  
Sonia Mahmoud ◽  
Nour Eldin T. Abdel-Ghani ◽  
Rasha Mohamed El Nashar ◽  
Mikhael Bechelany ◽  
...  
Keyword(s):  
Bacterial Infections ◽  
Pharmaceutical Preparation ◽  
Pharmaceutical Formulations ◽  
Selectivity Coefficient ◽  
Pvc Membrane ◽  
Carbon Paste ◽  
Serum Samples ◽  
Carbon Paste Electrodes ◽  
Antibiotic Drug

Levofloxacin (LF) is a medically important antibiotic drug that is used to treat a variety of bacterial infections. In this study, three highly sensitive and selective carbon paste electrodes (CPEs) were fabricated for potentiometric determination of the LF drug: (i) CPEs filled with carbon paste (referred to as CPE); (ii) CPE coated (drop-casted) with ion-selective PVC membrane (referred to as C-CPE); (iii) CPE filled with carbon paste modified with a plasticizer (PVC/cyclohexanone) (referenced as P-CPE). The CPE was formulated from graphite (Gr, 44.0%) and reduced graphene oxide (rGO, 3.0%) as the carbon source, tricresyl phosphate (TCP, 47.0%) as the plasticizer; sodium tetrakis[3,5-bis(trifluoromethyl)phenyl] borate (St-TFPMB, 1.0%) as the ion exchanger; and levofloxacinium-tetraphenylborate (LF-TPB, 5.0%) as the lipophilic ion pair. It showed a sub-Nernstian slope of 49.3 mV decade−1 within the LF concentration range 1.0 × 10−2 M to 1.0 × 10−5 M, with a detection limit of 1.0 × 10−5 M. The PVC coated electrode (C-CPE) showed improved sensitivity (in terms of slope, equal to 50.2 mV decade−1) compared to CPEs. After the incorporation of PVC paste on the modified CPE (P-CPE), the sensitivity increased at 53.5 mV decade−1, indicating such improvement. The selectivity coefficient (log KLF2+,Fe+3pot.) against different interfering species (Na+, K+, NH4+, Ca2+, Al3+, Fe3+, Glycine, Glucose, Maltose, Lactose) were significantly improved by one to three orders of magnitudes in the case of C-CPE and P-CPE, compared to CPEs. The modification with the PVC membrane coating significantly improved the response time and solubility of the LF-TPB within the electrode matrix and increased the lifetime. The constructed sensors were successfully applied for LF determination in pharmaceutical preparation (Levoxin® 500 mg), spiked urine, and serum samples with high accuracy and precision.

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