Current Analytical Chemistry - Volume 7, Issue 4, 2011

Human biomonitoring results can be used to evaluate prior metals' exposures but the data production must adhere to rigorous scientific standards including validation of the analytical method and calculation of the method's uncertainty. The whole procedure is often perceived as a difficult and time-consuming task. The aim of this paper was to in house validate a sector field inductively coupled plasma mass spectrometry-based Read More

The present experimental work concerns the analytical determination of gold in jewellery alloys by means of potentiometric titration. In this contribution we focus on the practical aspects of this topic, in order to define a suitable procedure to be applied on real business applications. Therefore, instead of house-built electrodes as investigated before, the use of commercially available ones (Mettler-Toledo DS500 and D Read More

In this study, Remazol Black B-containing sulfonamide resin was synthesized, characterized and used as a new sorption material in solid phase extraction for the determination of lead and nickel in water samples. The optimization of the parameters including pH, preconcentration period and the volumes of initial and elution solutions was performed. The optimum pH, preconcentration period and eluate volume were found to Read More

Electrochemical DNA biosensor was fabricated using the ZnO nanoparticles/chitosan (CHIT) nanocomposite membrane on modified gold electrode (AuE) as the working electrode. The ZnO/CHIT was used as a modified-AuE for the immobilization of the single-stranded DNA probe. This particular DNA biosensor provided some advantages such as the biocompatibility of the ZnO nanoparticles, good film forming ability of CHIT, and t Read More

A very selective, reliable and precise method for rapid separation of the trace amounts of copper in aqueous samples using octadecyl silica bonded phase membrane disks modified by N,N'-ethylene-bis-(3-formyl-5-methyl salicyl aldymine) combined with flame atomic absorption spectrometric determination has been established. All the affecting experimental variables such as pH, amount of modifier, eluent type, sample and el Read More

A new, simple and fast automatic spectrophotometric flow injection (FI) method to determine glucosamine in dietary supplements has been developed and compared against a batch method, both based on the same reaction: “Schiff's base” formation as a result of the reaction between ninhydrin and glucosamine. Temperature and flow-rate were the main parameters to optimize the FI method because the reaction kineti Read More

A sensitive method for the simultaneous determination of azithromycin (AZI), tilmicosin (TIL), acetylspiramycin (ACE), and roxithromycin (ROX) has been established using capillary electrophoresis (CE) coupled with electrochemiluminescence (ECL) detection. The use of ionic liquid (IL) significantly improved separation efficiency and detection sensitivity. The conditions for CE separation and ECL detection were investigat Read More

In this study a square - wave voltammetric method was developed and validated for the direct determination of glimepiride in bulk form and pharmaceutical formulations. The best results were obtained for the quantitative determination of glimepiride in 0.04 M Britton - Robinson buffer at pH 9.0 at -1160 mV vs. Ag/AgCl reference electrode. The experimental and instrumental parameters affecting the peak current of glime Read More

A novel poly (1-hexadecene-co-trimethylolpropane trimethacrylate) coating was prepared and applied as solidphase microextraction (SPME) for analysis of pesticides in tea samples. This SPME coating was fabricated on the surface of fiber by in-situ copolymerization of 1-hexadecene and trimethylolpropane trimethacrylate, in the presence of the ternary porogen (cyclohexanol/1, 4-butanediol/water). Both the effects of por Read More

Food allergy has become a serious human health concern. With more than 160 kinds of food allergens have been identified to date, allergen detection has become challenging. Most current allergen detection methods are capable of detecting only a few allergens at a time. The objective of this work was to develop a sensitive method for the detection of fish parvalbumin in food matrices employing a 3D aldehyde protein c Read More

An ionic-liquid ultrasound-assisted dispersive liquid-liquid microextraction method (IL-USA-DLLME) was introduced to determine four phenylurea herbicides (i.e., isoproturon, monolinuron, linuron, and diuron) in water samples with high performance liquid chromatography (HPLC). The ionic liquid of 1-hexyl-3-methylimidazolium hexafluorophosphate [HMIMPF6] was dispersed into the aqueous sample solution in fine droplets b Read More