JBCS

A method was developed and validated for evaluation of different species and geographical origins using targeted quantitative analysis and non-targeted FT-IR spectroscopy.

A heteropolysaccharide with a main chain composed by β-D-galactofuranosidic units (1→5) and (1→6) linked with residues α-D-glupiranosidic as a branch was isolated from C. gloeosporioides biomass. It did not present cytotoxic activity on CHO-K1 cells.

Differences in average composition of freebase cocaine and hydrochloride cocaine, showing that hydrochloride cocaine seized in the state of Rio de Janeiro is majorly composed of non-active compounds (diluents), while freebase cocaine is majorly composed of active compounds.

Synthesis of Quercetin derivative, UV analysis, FPS calculation, photo stability and incorporation in a sun protection formulation.

The amount and variety of foreign elements deposited on NiMo/Al₂O₃ catalysts increased and coke became more aromatic in the most recent generations as expected from the more drastic HDS conditions and the quality of the crude diesel.

As is presented in the Figure, when the temperature was 30-150 ℃, the hydrogen and oxygen or chlorine were absorbed in the surface of catalyst and then generated water or hydrochloric acid.

Development of solar filters using fast and low cost synthesis method.

We evaluated the effect of the addition of different hydrochar ratios on latosol and argisols on nutrient release and compared them with anthropogenic soils known for their high fertility.

Potentiometric sensor based on silver sulphide nanoparticles supported on hierarchical porous carbon (Ag₂S/HPC₄₀₀) as ink on a glassy carbon electrode for the detection of free cyanide (CN^-).

An analytical method capable of identifying caseinomacropeptide by Fourier Transform Infrared Spectra was developed using chemometrics methods.

As an innovation, a maleated natural gum (pine rosin) is used here as coupling agent for fiber composites or compatibilizer for biodegradable polymer blends, improving its mechanical properties while preserving biodegradability.

Essential oil analyses of Indigofera suffruticosa showed 89.9% of phenylpropanoids, with eugenol as major constituent. Oil and selected constituents showed toxicity and oviposition deterrence action against Tetranychus urticae.

Assessing biodegradation extent of Brazilian petroleum samples by the new parameter H30/DC coupled to H30/AC based on the homologue series of n-alkylcyclohexanes (C₁₃ to C₂₆), using the mass chromatogram m/z 83 obtained by gas chromatography coupled to mass spectrometry.

It is possible the use of copolymers (P3OT/P3MT) in hybrid solar cells, searching for new alternatives of materials photosensitizing. Photovoltaic comparative parameters of cells produced by TiO₂ and ZnO with P3OT/P3MT were investigated in this paper.

Using data provided by an automatic monitoring station, concentration and speciation data for volatile organic compounds and an air quality model, valuable information to understand ozone concentrations can be obtained.

LIBS applications in a myriad of samples: agriculture, food and electronic waste.

Microbial metabolomics has been applied in several microbiological areas. The metabolomics workflow mainly involves quenching and extraction of metabolites, instrumental analysis, processing and data analysis, all of these steps acting together essentially.

This tutorial review presents, in a concise way, a general and contemporary view of the rise of Enantioselective Organocatalysis in the Asymmetric Catalysis, following the evolution of the area from its versatile generic modes of catalyst activation.

Events in a single nanoparticle of TiO₂ during the UV-Irradiation: excitation of the electron (e^-) from VB to CB generating holes (h⁺), the e^-/h⁺ recombination, their trapping and charge transfer. Chemical O₂ demand and sample pretreatment exemplify analytical applications.

Evaluating teaching and learning processes and low pass rates in General Chemistry and interventional strategies that increase success rate.

Hydrogen evolution reaction on copper cathode in sulfuric acid solution by electrolysis.

This work presents the determination of Al³⁺, Fe³⁺ and Cu²⁺ in eye shadows makeup a potential higher level didactic strategy for discussing some analytical chemistry concepts through contextualization assumptions in the teaching of chemistry.

The discovery of palladium was confirmed in minerals from Minas Gerais, containing Pd in natural gold alloys, as in the sample shown above.

This paper is about the visit of Walther Hermann Nernst to Brazil, in 1914. The present study is based on the view the newspapers, at the time gave, to this visit and also based on the letters exchanged between Nernst's daughter and some of his former students.