JBCS

This work describes the covalent immobilization of an ironporphyrin, 5,10,15,20-tetrakis(pentafluorophenyl)porphyrin iron(III) chloride (FeTFPP), onto maghemite/silica magnetic nanospheres covered with aminofunctionalized silica and its use as catalyst for hydrocarbon and herbicide (simazine) oxidations

Cr absorption signal obtained by DS-GF AAS of 0.760 mg of crude oil sample without pre-treatement (red - Cr atomic absorption signal; blue - background signal)

The occurrence of polycyclic aromatic hydrocarbons (PAHs) in mussels (Perna perna) cultured in farms from Ilha Grande Bay (Rio de Janeiro State, Brazil) was evaluated for the first time. The levels of PAHs were generally low and below the threshold concentrations recommended for human consumption of shellfish. The results also revealed reasonable good local environmental conditions

Lanthanide nitrates [Ln(NO₃)₃] acting as catalyst in direct one-pot synthesis of 3-benzoyl- and 3-acetyl-1,2,4-oxadiazoles derivatives from aromatic ketones with electron-donating (EDG) and electron-withdrawing groups (EWG)

The described method consists of a rapid and simple liquid-liquid extraction procedure and posterior quantification by high-performance liquid chromatography (HPLC) with Vis/fluorescence detection. It was shown to be a sensitive method for the simultaneous determination of lycopene, β-carotene, retinol and α-tocopherol in human plasma and can be utilized in routines of clinical laboratories

The kinetic methods based on the potentiometric monitoring of the concentration perturbations of the both the Bray-Liebhafsky oscillatory reaction in a stable non-equilibrium stationary state and Dushman reaction in a steady state, are described. The methods are utilized for determination of uric acid in human urine samples

PAH concentrations recovered from certified reference sediment (NWRI EC-3). Vertical bars represent the standard deviation (n = 3) for the recovered and for the certified values (n = 3)

Studies of the solubility of the model dye disperse red 1 (DR1) in aqueous solutions, its determination in water samples and the interaction of the dye with calf thymus ds-DNA were performed using UV-Vis spectrophotometry

Currently used pesticides in water matrices in Central-Western Brazil reveal a higher diversity of compounds and frequency of detection in rain water than in surface and groundwater samples and point to the risk of pesticide contamination in important headwater streams in the study areas

4-(4-Nitrobenzylideneamine)phenol is used in the study of anionic chromogenic chemosensors in acetonitrile allowing the highly selective detection of F- and CN-. These chemosensors are based on acid-base and on indicator displacement strategies

Warm mix asphalt (WMA) is a new paving technology produced with temperature around 30 °C lower than conventional hot mix asphalt (HMA). Due to the reduction of temperature, less n-alkanes and polycyclic aromatic hydrocarbons (PAH) are generated during the production of WMA than HMA

During the alembic distillation process, the sugarcane spirit is separated into three different fractions which presented differences among their quantitative chemical profile. In this work was suggested a quantitative chemical model for it in order to support the standardization of this production step

A LED (light emitting diode) based photometer for solid phase photometry coupled to a multicommuted flow analysis approach forming a downsized setup that is designed for zinc determination in pharmaceutical products

Two azo-compounds derived from 4-amino-2-methylquinoline were synthesized and characterized. Their electrode reaction pathways were elucidated and discussed. Dissociation and stability constants of the examined azo-derivatives and stoichiometry of their complexes with some transition metal ions were determined

An environmentally-friendly procedure was developed for selective oxidation of sulfides at room temperature using 30 wt.% hydrogen peroxide as terminal oxidant and water as sole solvent. The catalyst is easily recovered post-reaction (via simple filtration) and reused at least eight times without a noticeable loss of activity

A saturation profile for chloride concentration was found in a kinetic study for the chlorate-chloride reaction, suggesting the formation of Cl₂O₃^2- intermediate. The proposed mechanism was able to reproduce the experimental behavior

Two natural depsides, 2,4-dihydroxy-3,6-dimethylbenzoate (1) and 3-hydroxy-2,5-dimethylphenyl 4-[(2,4-dihydroxy-3,6-dimethylbenzoyl) oxy]-2-hydroxy-3,6-dimethylbenzoate (2), were isolated from Cladosporium uredinicola and their effects on various steps of photosynthesis were investigated

The chemical investigation of the roots of Cordia polycephala resulted in the isolation of two new terpenoid naphtoquinones, named as cordiaquinones N and O. Both compounds showed cytotoxic effects with IC₅₀ values in the range of 1.2 to 3.4 μmol L^-1

Immobilized forms of TiO₂ permit almost total photocatalytic degradation of camphor in aqueous solution, including high mineralization degrees

The homogeneity of the components of a tablet was investigated using near infrared (NIR) imaging spectroscopy. Left side of the graphical abstract presents the chemometric technique used to find concentration maps of excipients and active pharmaceutical ingredient. Right side of the figure shows a tablet and the distribution of compounds in the tablet surface