JBCS

The action of organophosphorus (OPs) compounds on enzymes of the nervous system triggers several toxic effects.

A suitable and efficient method was developed for the determination of the tuberculostatic isoniazid and related impurities to study tablet excipients-drug compatibility.

The application of enzymes in sunflower oil extraction represents a promising alternative to extraction methods that use toxic solvents, besides presenting larger quantities of some bioactive lipophilic compounds compared with conventional techniques.

The dependence on ionic strength of the protonation process of ascorbic acid in non-aqueous solutions of NaClO₄ has been analyzed by means of the specific ion interaction theory (SIT). The protonation constants were calculated using the STAR (stability constants by absorbance reading) program.

The presented square wave cathodic adsorptive stripping voltammetry method was found to be highly accurate and precise for the determination of montelukast sodium in commercial pharmaceutical preparations and spiked human serum.

DSA^®-type electrode with nominal composition Ti/Ru_0.3Ti_0.7O₂ under ultraviolet radiation was employed aiming to enhance the degradation yields of the dye Reactive Blue 4. Photoassisted electrochemical process increases substantially the degradation of the organic compounds decreasing the energy cost.

For evaluating the copper extraction applying rotating disc contactor apparatus, the aqueous phase pH and extractant concentration were primarily selected from batch experiments results. Then the effect of operating parameters on the copper extraction was investigated in rotating disc contactor column.

The bioavailability of heavy metals in the environment may be affected by improper disposal of e-waste, which can ease migration of these chemical species, especially the lead. To investigate the migration of lead printed circuit boards for a simulated soil in small scale tests have been made wherein incubated printed circuit boards in mixtures containing organic matter, kaolin and iron oxide, based on a Simplex-Centroid experimental design.

Conformerism in four sulfonamide-chalcone hybrids and high cytotoxicity (low IC₅₀) for two of them against three cancer cell lines.

This is a mild, efficient, inexpensive and selective method for the deprotection of aryl tert-butyldimethylsilyl (TBDMS) ethers in the presence of alkyl silyl ethers using sodium cyanide (NaCN) in ethanol.

Influence of the presence and content of cellulose nanocrystals on the poly(lactic acid) (PLA) crystallization kinetics, fitting to Avrami model.

A simple, fast, sensitive and accurate spectrophotometric method has been developed for the quantitative determination of cephalexin monohydrate in dosage form and in commercial formulations. The method involves the addition of Ce^IV to cephalexin in acidic medium, followed by the determination of residual Ce^IV by reacting with a fixed amount of methyl orange.

Sample preparation of xanthan gum by acid digestion using reflux system and determination of Ca, Cu, K, Mg, Na and Zn by using spectrometric techniques.

Electrochemical oxidation of fipronil molecule over graphite-polyurethane electrode was investigated by voltammetric and quantum chemical methods.

The modified commercial bentonite can be used to remove pollutants. The sol-gel process affords homogeneous hybrid materials under mild conditions, at low temperature, allowing for incorporation of a variety of compounds into the matrix. Bentonite can be modified by the sol-gel process.

The electrochemical synthesis of selenophene-3-chlorothiophene copolymers was achieved potentiostatically. The spectroelectrochemical properties of the obtained films were investigated and compared with the individual homopolymers.

A new and sensitive procedure was developed for the fluorometric determination of ammonium nitrogen in water samples using derivatization with benzyl chloride.

C-C and C-O hydrogenolysis were compared on supported Ir catalysts from a fundamental point of view in order to determine the structure requirements and the state of the catalytic sites.

This sequence of reactions opens the new approach to the synthesis of novel polyheteroconjugated systems, consisting from iminodihydrofuran rings.

The figure shows a gold nanopillar scanning electron microscopy (SEM) image of pterin-6-carboxylic acid adsorbed on the head of the nanopillar. Leaning of nanopillars leads to an effective accumulation of pterin-6-carboxylic acid molecules within the electromagnetic hot spots in the proximity of the gold nanopillars where the Raman scattering signal is enhanced the most.