JBCS

Apparatus for dissolution assays of pharmaceutical preparations exploiting a flow-system with multi-commutation. The output of the detection system shows the transient signals and the corresponding dissolution curves.

Potential and pH procedure for the sequential voltammetric determination of metallic traces in saline hemodialysis concentrates. Chromium was quantified by adsorptive cathodic stripping voltammetry. Anodic stripping voltammetry was used for Tl, Cd, Pb, Cu and Sb quantification.

This study presents the distributions of Cd, Cr, Cu, Ni, Pb and Zn in sediments of the Sergipe River. All of the sediment samples presented evidence of anthropogenic enrichment and around 30% of the metal content was present in the inert fraction.

A forced degradation study on citalopram hydrobromide has revealed five degradation products.One photolytic and two hydrolytic products are characterized through LC-MS studies. A SIAM is developed and validated for quantitative analysis of citalopram.

Synthesis of 3-isoxazoline substituted phthalazine-methoxyacrylate derivatives.

The acid-base indicator dyes were embedded into the gelatin films by extracting from aqueous media under appropriate conditions. The well-reproducible indices of the apparent ionization constants, pK_a^app, of the indicators were calculated by conventional equating the pH values of the bulk aqueous buffer and those of the 'internal' water into the gelatin films.

UV-Vis spectra of eleven experiments performed through a full 3² experimental design for CuETB complexation study.

The electrolytic plug flow reactor was used: (i) to demonstrate that NaCl is a better supporting electrolyte than Na₂SO₄; (ii) to determine the effect of NaCl concentration on phenol removal; (iii) to determine the influence of electrolysis time on COD removal.

This figure shows the steps of the analytical procedure.

This study determined the residual levels of permethrin and deltamethrin in the liver and heart tissues of Wistar rats submitted to sub-chronic oral exposure with pyrethroids, as well as the effect of ingesting fibers on the residual levels of the pyrethroids by using GC-ECD analysis.

Dexamethasone as steroid hormone do not have electrooxidation on pencil graphite electrode but with using of multiwalled carbon nanotubes it shows the electrooxidation behavior.

Poly(N,N'-dibromo-N-ethyl-benzene- 1,3-disulfonamide) [PBBS] and N,N,N',N'-tetrabromo-benzene-1,3-disulfonamide [TBBDA ] are reusable and efficient catalysts for the synthesis of 4H-chromenes and dihydropyrano[3,2-c]chromenes.

Arsenic and mercury determinations were realized in 28 sediment samples from the Sao Francisco River Basin, Minas Gerais. The elements were analysed by hydride generator atomic absorption spectrometry (HG AAS). Adictionally, mercury determination was realized in the solid samples by direct mercury analyzer (DMA).

Online ESI-MS monitoring provided detailed information about organic intermediates connecting parent molecules and final mineralization products during advanced oxidation processes of Nadolol, Atenolol and Acebutolol.

Correlation coefficients between the DPPH· and FRAP methods, and contents of phenolic compounds and flavonoids of propolis ethanolic extracts obtained with different concentrations of propolis and ethanol contents.

Structure of a natural triterpene, 3 b,6 b,16b-triidroxilup-20(29)-eno, isolated from Combretum leprosum fruits which has leishmanicidal activity against Leishmania amazonensis promastigotes.

Complete 1D/2D NMR data are presented for 3-oxo-12a,29-dihydroxyfriedelane and 3,16-dioxo-dihydroxyfriedelane isolated from branches hexane extract of M. gonoclada. The antimicrobian activity of some constituents are also reported.

Graphical representations of methanesulfonic acid and the two conformers of methanesulfinic acid, whose spectroscopic and thermochemical properties were obtained from high level ab initio calculations.

Essential oils and morphological characters from thirteen Hypenia spp. revealed the presence of two taxonomic clusters.

Our work has demonstrated that the reaction of aminopropylsilicalgel NPs with labile 2-methoxy-1,4-naphthoquinones is a good route to silica NPs containing bound amino-naphthoquinones.

TPotential energy curves along the Internal Reaction Coordinate path for the rotation motion of methylamine, dimethylamine and trimethylamine molecules.

The oximato-bridged copper(II)-manganese(III) chains of formula [MnCu(deg)₂(CH₃COO)(H₂O)₂] (1), [MnCu(meg)₂(CH₃COO)(H₂O)₂] (2) and [MnCu(dmg)₂(CH₃COO)(H₂O)₂] (3) (H₂deg = diethylgly-oxime, H₂meg = methylethylglyoxime and H₂dmg = dimethylglyoxime) exhibit intrachain ferromagnetic coupling and slow relaxation of the magnetisation, behaving as single chain magnets (SCMs).

Graphical abstract represents the chromatogram of gemifloxacin (GMFX) at a concentration level of 25 ìg mL^-1 in mobile phase (a) composed of methanol:water (90:10, v/v) and human serum (b) at 270 nm, obtained by applying the proposed method.

The endophytic fungus Pestalotiopsis guepinii was grown on rice and produced a new anthra-quinone derivative named guepinone.

The C-24 configurations of the two marine sterols were determined by comparing their NMR data with those of stereodefined (24R)- and (24S)-samples that were synthesized in routes involving the orthoester Claisen rearrangement.