JBCS

Novel coumarin derivatives have been synthesized in good yields by three-component reactions of 7-hydroxy coumarins, dialkyl acetylenedicarboxylates and aromatic aldehydes in the presence of NEt₃ under mild reaction conditions.

The second generation biofuels produced from waste biomass material appear as a promising substitute to fossil fuels. The potential uses of the liquid biofuel have the high acidity as the main technological barrier. The bio-oil obtained from waste fish oil was submitted to reactive distillation during the refinement, in a process known as bio-oil upgrade, employing a widely available alcohols and cheap reactants as catalysts to improve their quality.

The essential oil of roots of Jatropha ribifolia, obtained by hydrodistillation was characterized in terms of its chemical composition by GC-FID and GC-MS. The essential oil and fractions were tested in vitro against nine human cancer cell lines by sulforhodamine B assay.

Metalloproteomic profile of muscle tissue samples from Nile tilapia (Oreochromis niloticus).

Yield of 1,3-diglyceride (1,3-DG) is improved 1.42-fold through optimization of medium via glycerolysis of triglyceride (TG) catalyzed by whole-cell lipase from a new isolated strain, Aspergillus niger GZUF36.

Multivariate data analysis were employed to correlate the antimalarial activity of tetrahydropyridines derivatives with electronic structure data obtained through quantum mechanical calculations. The results bring valuable insights in order to design new active compounds.

Functionalized elastomeric networks with imidazole or benzimidazole functional groups, derived from poly(dimethylsiloxane), were able to absorb copper(II) from aqueous solutions. The metal removal proceeded in accordance with the Sips adsorption model.

Preparation and characterization of new melanin chemically modified with serine and threonine amino acids, with low toxicity and high antioxidant capacity, potential molecules for pharmaceutical industry and food chemistry.

This work presents an evaluation study of Salvia hispanica L. oil extracted by subcritical n-propane, compared to different conventional lipid extraction methods. Subcritical n-propane method is better than other methods, this is a promising alternative for oil extraction and results in a product with great composition, oxidative capacity and high purity.

SAPO-34/ZSM-5 composite was synthesized with nano-sized ZSM-5 zeolite as seeds. It has a sphere-like morphology and a large quantity of mesopores. Owing to its proper acidity and mesoporosity, the composite exhibits high stability in the conversion of methanol to hydrocarbons (MTH reaction).

A homogeneous and stable sediment material (SED 001) was produced for quality assurance when quantifying hydrocarbons and trace elements in sediment samples.

Comparison of elution efficiency of the anionic model compound (sunset yellow) using conventional solid phase extraction (right cartridge) and electric field-assisted solid phase extraction (left cartridge).

A schematic representation of the fluorogenic assays with (Quick-ee) and without competitor.

Two uncommon compounds, a meroterpene naphthoquinoid (cordiaquinone P) and a new lignan derivative were isolated from the roots of Cordia leucocephala. Their structures, including the relative stereochemistry, were determined by spectrometric methods.

Composites of multi-walled carbon nanotubes and poly ortho aminophenol (POAP) were prepared by electropolymerization. Density functional theory calculation, optical properties and electrocatalytic activity of the composite have been investigated.

The dielectric properties of anionic aliphatic polyesteramides were investigated by analyzing the complex dielectric permittivity, complex electric modulus, and complex impedance in the frequency range 10⁰ Hz to 10⁶ Hz, at room temperature.

HPLC-DAD-UV spectra were used to compare the chemical compositions in the different seasons. The results confirm a peripherally-mediated anti-inflammatory activity of V. condensate. The seasons had significant effects on the relative abundances of the metabolites.

This paper describes a new method for quantification of metal in supported catalysts using slurry sampling flame atomic absorption spectrometry. The slurry method allowed satisfactory results with no need for laborious extraction procedures.

Besides Malva sylvestris, other plants are also known as "malvas" in Brazil. Direct infusion was used to differentiate three distinct species via electrospray ionization mass spectrometry fingerprintings and a partial least squares discriminant analysis method.

Mechanism for coalescence of colloidal particles occurs in a two-step mechanism: a rapid reversible agglomeration and a slow irreversible aggregation.

The synthesis and radical scavenger activity of 2-aryl-3-(pyridin-3-ylmethyl)thiazolidin-4-ones were reported.

Eight steroids-based pyrazolinyl derivatives were synthetized by several steps and the compound where Ar = ph exerted marked insecticidal activity, comparable to that of the natural product insecticide celangulatin V.

There is a clear correlation between the biodiesel quantity in a diesel-biodiesel blend and its flash point. This means that the experimental determination of a flash point temperature also provides information regarding the biodiesel content of diesel-biodiesel blends.

Mechanochemical complexation of phenylenebis(methylene)dicarbamates and benzenediols confirmed by Fourier transform infrared spectroscopy.