Current Analytical Chemistry - Volume 11, Issue 1, 2015

Since the discovery of their benign (non-toxic) and excellent fluorescent properties, carbon dots (or C-dots) have attracted extensive attentions and presented a clear demonstration of great potential in bioanalytical applications. This intrinsic and somewhat exceptional nontoxic property of C-dots makes them potential alternatives to the conventional semiconductor quantum dots counterpart containing heavy metals that pose seri Read More

We developed a method that uses electrochemical impedance spectroscopy (EIS) to choose an electrode to determine photosensitizing dye No. 201 (quaternium-73), a thiazolium derivative, in cosmetics. The method is based on nanoparticle metal oxide (tin, cerium, cobalt, iron, and nickel)-modified carbon paste electrodes. Using differential pulse voltammetry (DPV), we found that the electrocatalytic property of tin oxide w Read More

A novel polyvinyl chloride (PVC) membrane sensor that is highly selective to Fe3+ ions was prepared by using 5-chloro-3-[4-(trifluoromethoxy)phenylimino]indolin-2-one (CFMEPI) ionophore. The sensor exhibits a Nernstian response for Fe3+ ions over a wide concentration range (1.0 ×10-2 -1.0×10-6M) with a slope of 46.7±0.5 mV per decade. The sensor has a response time of 20s and can be used for at le Read More

An efficient liquid-liquid extraction method was developed for the removal of Cd2+, Ni2+, Pb2+, and Zn2+ from environmental waste using n-benzoyl-n-phenyl hydroxylamine (BPA). The effects of solvents, pH, stripping agents, extraction time, and interference of other ions on the recoveries were investigated. Study shows chloroform is the most efficient solvent for BPA and maximum extraction percentage of met Read More

This paper proposes a method using slurry sampling and cold vapor atomic absorption spectrometry (CV AAS) for the determination of mercury in iron supplement used for the treatment of anemia. The optimization step of the slurry preparation was performed using a two-level full factorial design involving the experimental factors: hydrochloric acid concentration, thiourea concentration and sonication time, having as chem Read More

In this work is suggested a Clark type electrode with disposable enzyme membrane for phenols determination. This approach allows avoiding the electrode fouling by recording the oxygen reduction current, and obtaining a stable and reproducible sensor response. An appropriate method for enzyme membrane fabrication by cellulose acetate filters coating with tyrosinase through the use of biocompatible hydrogels was propo Read More

Two different enzyme electrodes for the determination of ethanol in alcoholic beverages were developed by immobilizing alcohol oxidase or catalase in a k-Carrageenan gel layer overlapping an amperometric gaseous diffusion Clark type oxygen electrode. The response of biosensors toward standard solutions of ethanol,methanol, n-propanol, n-butanol, ethylenglycol and glycerol was recorded, compared and discusse Read More

Separation of 5-(dimethylamino) naphthalene-1-sulphonyl (DNS-) derivatives of some amino acids (alanine, leucine, valine, phenylalanine) D- and L-enantiomers with high-performance thin layer chromatography (HPTLC) and pressurized planar electrochromatography (PPEC) both with β-cyclodextrin as the component of the mobile phase is presented. The separation mechanism in the PPEC technique involves two effects Read More