جستجوی مقالات مرتبط با کلیدواژه "coated wire electrode" در نشریات گروه "شیمی"

Cephalexin monohydrate can be detected using potentiometric sensors made of coated wire electrodes. The Cephalexin monohydrate sensor was made of cerium oxide nanoparticles that were made using green synthesis techniques. At concentrations of 3.0×10-9-1.0×10-2 mol.L-1, an excellent response was observed with values of -54.78 and -54.76 mV.decade-1, respectively. The detection limits were between 4.0×10-2 and 9.8×10-2 mol.L-1 for CEX-PT-CeO2 NPs containing a sensor's leaves extract of Myrtus communis and CEX-PT-CeO2 NPs containing a sensor's leaves extract of Mentha. For CEX-PT-CeO2 NPs with Myrtus communis sensor leaves extract and CEX-PT-CeO2 NPs with Mentha sensor leaves extract, the PH ranged from 3.5 to 6.5, and the lifetime was 52 days. With concentrations of 8.0×10-10-1.0×10-2 mol.L-1, the CEX-PT-CeO2 NPs sensor displayed a non-Nernstian response close to -35.96 mV.decade-1, limit of detection of 4.0×10-10 mol. L-1, with a pH of 3.0-8.0. As a CEX-PT-CeO2 NPs sensor, a new coated wire electrode was developed in this study. The limit of detection, selectivity, and concentration range of the two sensors were all very high. These sensors were used to find Cephalexin monohydrate in pharmaceutical and pure products.

The present work aimed at comparing the capabilities and efficiency of symmetric and asymmetric electrodes for potentiometric detection of Cu2+. Initially, we synthesized N-(benzothiazol-2-ylcarbamothioyl)benzamide, and 1H-NMR, 13C-NMR, and FT-IR spectroscopy approaches were used for characterization. Subsequently, it was employed as an ionophore to fabricate asymmetric electrodes of coated wire (CWE) and solid-state (SSE) and symmetric electrodes with liquid internal electrolyte (LIE). The best liquid membrane was prepared with an Ionophore: DBP: PVC: NaTPB ratio of 12:56:30:2. All electrodes exhibited Nernstian responses. The detection limits for SSE (1×10-9 mol/L) and CWE (1×10-7 mol/L) were superior to LIE (2×10-6 mol/L). Moreover, all three electrodes demonstrated very short response times (approximately 6 seconds) and exhibited large selectivity coefficient values for different cations. Asymmetric electrodes displayed longer lifetimes (SSE: 13 weeks and CWE: 12 weeks) compared to the symmetric electrode (LIE: 10 weeks). Finally, the electrodes were utilized for potentiometric titration of Cu2+ with ethylenediaminetetraacetic acid.

A new coated–wire membrane selective electrode as a potentiometric sensor was developed for the determination of isoproterenol. Naphthylethylenediamine dihydrochloride–tetraphenyl boranuide ion–exchangers was used as an electroactive material on the membrane. The sensor displays a linear response with a slope of 56.9 mV decade–1 for isoproterenol in the concentration range of 1.0×10–2–5.0×10–6 mol L–1, with detection limit of 3.3×10–6 mol L–1. The potentiometric response is independent of the pH of the solution in the pH range of 3.0 – 6.8. Selectivity coefficient data for some common inorganic cations, sugars and components of the mixed drugs were investigated and showed negligible interference. The response time of <5 s was displayed. The sensor can be used for more than 2 months without any considerable divergence in the potential. For the practical purposes, the efficiency of the method in the extraction and determination of isoproterenol for biological fluids such as urine and blood serum samples was evaluated without any special pretreatment.