The composition of a polymeric potential-determining phase for ketoprofen selective electrode has been determined and the following basic electrode parameters were examined: measurement range, slope characteristic, limit of detection, response time, lifetime and selectivity coefficients in relation to some organic and inorganic anions. The electrode have been used for ketoprofen determination i...

AB STRAC'T A multipolar split cuff electrode is used for fascicle selective recording of the electroneurogram (ENG) of the sciatic nerve of the rabbit. Several electrode configurations were evaluated with regarding to seleclivity: the peroneal and tibial nerves were stimulated alternately and the ENG was recorded at different sides of the sciatic nerve. The results for two electrode configurati...

A dehydroabietyl derivative 2 bearing a 2-(2'-hydroxyphenyl)benzimidazole unit was synthesized and its sensing behaviors toward metal ions were investigated by UV-Vis and fluorescence spectroscopy methods. In THF solution, compound 2 exhibited excellent selectivity for CuII over miscellaneous other metal ions including CrII, MnII, CoII, NiII, ZnII, CdII, AlIII, MgII, PbII, HgII, NaI, LiI and KI...

A new synthetic methodology of water-soluble gold and silver nanoparticles (AuNPs@TC and AgNPs@TC), using the antibiotic tetracycline (TC) as co-reducing and stabilizing agent, is reported. Both colloids exhibit high water stability. The average sizes obtained were 25±10 and 15±5 nm, respectively. Both composites were tested against TC-resistant bacteria, presenting an increasing antibacterial ...

A simple thermodynamic theory of the equilibrium potentials of membrane electrodes is formulated and applied to the glass electrode for measurement of pH. The new formulation assumes the selective adsorption or binding of specific ions on the surface of the membrane which may or may not be permeable to the ion, and includes the conventional derivation based on reversible ion transport across me...

Ten nitrate-selective electrodes based upon rubbery membranes containing various betaine salts as sensors covalently bound to a cross-linked polystyrene-block-polybutadiene-block-polystyrene (SBS) polymer have been produced. The membranes were robust, highly selective, and effective over a pH range of 2-8. The best nitrate-selective electrode fabricated contained 10% m/m dicumyl peroxide, 40% 2...

electrochemical: Yellow Springs Instrument Co., Yellow Springs, OH 45387) for assaying galactose. For both fluorometric procedures, all reagents and standards were prepared as previously described (1). The manual assay requires 400 jiL of Tris buffer (10 mmolJL); 600 ,iiL of a solution containing p-hydroxyphenylacetic acid (50 mg/ L) and horseradish peroxidase (EC 1.11.1.7) (10 mgIL); 160 1zL o...

Combination of the exceptional properties of graphene oxide with the selectivity of lead porphyrin leads to fabricate a novel cysteine-selective sensor. The electrode made of 30% PVC, 53% NPOE, 2% NaTPB and 15% GO-PP was found to show the most favorable behavior. The sensor shows a Nernstian response (58.8 mV decade) in the concentration window of 5.0×10-5.0×10 M with detection limit of 8.0×10 ...

Article history: Received 11 March 2009 Accepted 16 March 2009 Available online 20 March 2009 Communicated by V.M. Agranovich A simple description of the electrode potential based on the selective ionic adsorption is proposed. It is shown that if the adsorption–desorption coefficients entering in the Langmuir kinetic equation for the adsorption at the limiting surfaces are not identical, a diff...