Anodic memristors obtained by electrochemical anodization of Ta in phosphate, borate and citrate buffer solutions are studied. Memristive behaviour is demonstrated electrical switching between high low conductive states. The endurance retention devices analysed. use phosphate leads to 4 levels the highest ratio resistive All studied oxides stoichiometric Ta2O5 only P detected inside anodic memr...

By using an electroactive species such as ferrocene (Fc), the electrochemical properties of bioorganic molecules were indirectly made accessible. 50-Fc-NH-ssDNAs have a redox potential of 430–440 mV (vs. AgjAgCl) in a borate buffer (pH 9), which is characteristic of ferrocene/ferrocenium (Fc/Fcþ) substituted by an amide group. The diffusion coefficient of Fc–ssDNA conjugates in a buffer solutio...

Capillary electrophoretic profiling of hair fractions obtained by 0.25 M HCl treatment of the tissue with subsequent extraction of the solubilized fraction with chloroform-isopropanol (9:1, v/v) revealed clear differences between hair obtained from alopecia areata affected laboratory rats (both in hair obtained from non-affected areas and hair growing on once hairless patches) and controls. Dif...

A capillary electrophoretic method (CE) with ultraviolet absorption detection for baclofen in human plasma was developed. The separation was obtained by CE with 50 mM borate buffer at pH 9, followed by detection with an ultraviolet detector at 225 nm. The plasma samples were deproteinized with acetonitrile to remove proteins and to induce sample stacking. With stacking, the limit of detection (...

A capillary electrophoresis with electrochemical detection was developed for the simultaneous determination of three flavonoids (naringenin, rutin, quercetin) and ascorbic acid. It was found that naringenin, rutin, quercetin and ascorbic acid were well separated within 5 min in borate buffer solution (pH 8.6, 24 mM). The detection limit was 1.0 microM for naringenin, 8.0 microM for rutin, 2.0 m...

The separation of nine furanonaphthoquinones by micellar electrokinetic chromatography (MEKC) is described. The running electrolytes used in this method were 0.03 M sodium dodecyl sulphate (SDS) in 0.09 M borate buffer (pH 9) containing 10% methanol, with an applied voltage of 20 kV. Application of this technique in the determination of the main furanonaphthoquinones, 5-hydroxy-2-(1-hydroxyethy...

A rapid method for speciation and determination of organomercury compounds in biological samples of marine origin using Capillary Electrophoresis (CE) is reported. Organomercurials were extracted from the samples by means of the classical Westöö procedure thus giving organomercury-cysteine complexes which can be separated from each other by means of CE resulting in effective speciation. Electro...

A sensitive high performance liquid chromatography (HPLC) method for the determination of Norfloxacin in pharmaceutical preparation is described. The proposed method was based on the derivatization of Norfloxacin with 4-chloro-7-nitrobenzofurazan in borate buffer at pH 9.0 to yield a fluorescent product. The chromatographic separation was achieved on a C18 column (150 mm×4.6 mm) using a mobile ...

Electrokinetic chromatography (EKC) with poly(sodium undecylenic sulfate) (poly-SUS) is utilized to separate environmental pollutants such as 2-6-ring polycyclic aromatic hydrocarbons (PAHs). Parameters such as pH, concentration of polymeric surfactants, and the use of organic modifiers were investigated to follow the retention trends of PAHs. A baseline separation of all 16 PAHs in about 30 mi...