Current Analytical Chemistry - Volume 12, Issue 2, 2016

In recent years, cloud point extraction (CPE) has become widely utilized for separation and preconcentration of trace metals. CPE uses the property of nonionic surfactants in aqueous solutions to create micelles and to become turbid when heated to particular temperature (so-called cloud point temperature). Above this temperature, the micellar solution separates into two phases: a surfactant-rich phase of a small volume, and a Read More

This paper presents a comparison between a multiple response function (MR) proposed for optimization of analytical strategies involving multi-element determinations with the desirability function D, which was proposed by Derringer and Suich in 1980. The MR function is established by the average of the sum of the normalized responses for each analyte considering the highest value of these. This comparison was performe Read More

This paper proposes a method for the determination of total selenium in eggs employing hydride generation atomic fluorescent spectrometry (HG AFS). The optimization step of the experimental conditions for quantification of selenium was performed using factorial design and Doehlert matrix involving the factors: pre-reduction time, pre-reducing volume, hydrochloric acid concentration and sodium tetrahydroborate concentra Read More

A method for investigating migration of some of the most widely used polyolefin stabilizers into aqueous and ethanolic simulants is presented. Main advantage of the proposed approach is that concentrations down to 0.05 μg L-1 (Irganox 1010 and Irganox 1076) – 0.1 μg L-1 (Irgafos 168 and Irgafos 168ox) can be determined without any additional pre-concentration step. This is achieved via direct injection of 1000 μl of simula Read More

Objective: The aim of this study was to prepare and assess the solubilization and antitumor activity of oleanolic acid lysinate. Methods: Oleanolic acid lysinate was prepared as a potential antitumor pro-drug by co-grinding or rotary evaporating method. Characterization of oleanolic acid lysinate was achieved by X-ray powder diffraction, infrared spectroscopy, and differential scanning calorimetry techniques. Solubilization Read More

The cyanide anion (CN−) is known to be an extremely toxic anion and can directly lead to the death of human beings in several minutes because it strongly binds cytochrome-c, thereby disrupting the mitochondrial electron-transport chain and causing a decreased oxidative metabolism and oxygen utilization. A colorimetric sensor L1 bearing azosalicylic aldehyde of benzoyl hydrazone was designed and synthesized. The bindi Read More

This paper presents a comprehensive statistical evaluation of the conductivity performance of PEDOT/PSS films generated at various spin coating speeds (1000 to 5000 rpm) by correspondence analysis (CA), regression and ANOVA models. Poly(3,4-ethylenedioxythiophene) (PEDOT) is a highly conducting insoluble polymer which, when doped with poly(styrene sulfonic acid) (PSS) in water, results in a dispersion with good film for Read More

The adsorption and inhibition behaviors of an organic corrosion inhibitor (C12) on the surface of the carbon steel in chloride solution were systematically investigated by using electrochemical measurements. The results indicated that C12 exhibited inhibition and curative effects on the depassivation steel in the presence of chloride. The inhibition efficiency (IE) of C12 was also studied at different temperature. It was see Read More

The special properties of platinum group of elements (PGE's), particularly platinum, palladium, rhodium, ruthenium, iridium and gold have many applications in anthropogenic activities. The importance of PGE's and gold led to the development of sensitive analytical methods to quantify them in different types of samples. The performance of an axial viewing 40.68 MHz inductively coupled plasma atomic emission spectrometry Read More

Context: Homocysteine (Hcy) is an amino acid that occurs in the body as an intermediate in the metabolism of methionine and cysteine. Hcyinplasma is a disease risk factor associated with both atherosclerosis and depression. The relation between Hcy balance and complication of atherosclerosis and depression remains unclear. Determination of Hcy in plasma is important and necessary for the research on comor Read More