JBCS

In this work, it was carried out a study of the OXA-Michael-Henry reactions between salicylaldehyde and β-nitrostyrenes, catalyzed by L-proline. The corresponding (R)-3-nitro-2-phenyl-2H-chromenes were obtained in 25-55% enantiomeric excess (ee) (20 mol% L-proline) and 50-70% ee (stoichiometric amount) employing Ti(OⁱPr)₄ as Lewis acid.

Organic and inorganic acids were measured in the air of Salvador City and correlations were identified between these acids, criteria air pollutants and meteorological parameters.

The level of metal contents of Ca, Fe, Mn, Cu, Pb and ²⁰⁷Pb / ²⁰⁶Pb vs. ²⁰⁸Pb / ²⁰⁶Pb in the Gulf of Prigi reflected by natural sources such as mineral sources from marine sediment.

Ocimum gratissimum oil showed significant variation in its thymol/γ-terpinene/p-cymene chemotype during the seasonal and circadian studies. Probable synergistic action of these constituents contributes to the antioxidant and antifungal potential of the plant.

Sex and alarm pheromones emitted by Leptoglossus zonatus adults and nymphs.

Analysis of the intermolecular interactions between carbohydrates and aromatic amino acids through ¹H nuclear magnetic resonance (NMR) and density functional theory (DFT) calculations, employing non-covalent interactions (NCI), natural bond orbital (NBO), and energy decomposition analyses (EDA) methodologies, showed the importance of the dispersion component of the intermolecular interaction for the recognition of carbohydrates by aromatic amino acids and the electrostatic component for the differentiation between the faces of the monosaccharide.

Fingerprinting analytical techniques associated with chemometric analysis and mixture design enabled the chemical discrimination of the sun-exposed and self-shaded leaves of Rollinia mucosa in each of the four seasons.

Fingerprinting chromatograms from Lippia alba (Mill.) N. E. Brown extracts and PC1 vs. PC2 scores graph.

Schematic illustration of the sensitive fluorescence detection of rutin (RT) based on Cu-doped carbon quantum dots (Cu-CQDs).

Five paraffin standards of different average molar mass distributions (M_w) were easily ionized by atmospheric pressure chemical ionization Fourier transform ion cyclotron resonance mass spectrometer (APCI(+)FT-ICR MS) using isooctane as the reagent gas. Data obtained from APCI(+) analysis were compared to results obtained from analysis of high temperature gas chromatography with a flame ionization detector (HTGC-FID), GCxGC-MS and ¹H and ¹³C nuclear magnetic resonance (NMR) spectroscopy.

Kinetics of degradation of fluoxetine through ultraviolet (UV) and UV/microwave (MW) processes as mediators of direct photolysis and formation of hydroxyl radicals.

The figure shows the increase in the selectivity to acrolein, through oxidative dehydration of glycerol, when vanadium and molybdenum are supported on alumina, maintaining low selectivity for CO_x.

Discrimination of Eugenia dysenterica using paper spray mass spectrometry.

Functionalized dienes as potential multi-targeted therapeutics for Alzheimer's disease.

The modification of four extra virgin olive oils from different origins with refined soybean oil, in the proportions of 0, 5, 10, 20 and 30% m/m, was studied using two approaches. First, the induction period (IP) was determined by Rancimat. In the second strategy, ion chromatography was used to quantify the formic and acetic acids, in their carboxylate forms (formate and acetate).

Lipids of human milk are extremely important nutrients for the baby proper development. This study assessed the fat content, lipid profile and fatty acid composition in pools of human milk, comparing the reference method with the creamatocrit method employed in human milk banks.

A fast and reliable methodology for creatinine determination in urine samples using graphene oxide paper by paper spray ionization mass spectrometry.

Captopril tablets were dissolved in the wells of a microplate. The reaction between captopril and iodine solutions releases heat and the temperature of solutions rise. Infrared thermal imaging was used for simultaneous temperature monitoring of several wells and the temperature increase was directly related to the amount of captopril.

A micro-flow-batch analyzer for sulfite determination in wines, whiskies, vodkas and beers.

The structural similarity between venomous agent X (VX) and O-(4-nitrophenyl) O-ethyl methylphosphonate (NEMP) makes the latter a valuable tool for research on novel acetylcholinesterase reactivators.

A new flavonol triglycoside was isolated from Aristolochia trulliformis flowers together with 15 known compounds.

Miniaturized spectrophotometric assays were used to determine the antioxidant potential in strawberry and cherry fruits. Simultaneous analysis employing a reduced amount of samples and reagents were performed. Strawberry fruit showed a higher source of bioactive compounds.