JBCS

Single drop microextraction was proposed to determine fourteen pesticides in water samples. The method has demonstrated to be accurate, precise, rapid, simple and to require smaller volumes of organic solvent. The proposed method may be successfully applied for the drinking water monitoring.

Electrochemical oxidation of tryptophan at a carbon fiber ultramicroelectrode.

The synthesis and electrochemical properties of gold nanoparticles stabilized with chitosan, as well as their immobilization with cobalt(II) phthalocyanine to form layer-by-layer films, are reported.

Oxide films formed in alkaline media on AISI 316L using cyclic sweep voltammetry (CSV) during the faster cycling rate (10 mV s^-1). The higher scan rate promoted the formation of thinner films richer in Fe³⁺ species, mainly hydroxides, and more resistive. Neutral pH promoted a lower magnetite formation and more resistive layers with Mo presence.

In this work, the degradation of diuron using electrodes of different compositions of ruthenium and iridium oxides was investigated. Ruthenium based anodes showed a better efficiency than iridium ones to remove the herbicide.

The manuscript describes the optimization and application of a method for determination of Se, Cr and Cu in food dyes using graphite furnace atomic absorption spectrometry.

Aliskiren is proposed to be oxidized at the benzylic carbon and reduced at the amide carbonyl groups. Limits of detection and of quantification for aliskiren were found in the low μg L^-1 range for the proposed methods.

Microwave radiation was applied to closed vessels for sediment removal. After irradiation, crude oil phase could be characterized due to low content of sediments, salt and water.

The first synthesis of phosphonate derived from pyrazolo[3,4-b]pyridine was achieved by a one-pot strategy from their corresponding carboxylic acids. An X-ray structure of one bisphosphonate is presented.

The oxidation of the drug intermediate 1-(2-hydroxyethyl)piperidine by [Ag(HIO₆)₂]^5- was carefully studied by spectroscopic techniques, leading to the determination of the rate constants and associated activation parameters. A consistent reaction mechanism was proposed from the derived rate law allowing the in depth understanding of that reaction.

This work describes the isolation of a previously unreported xanthone and a series of tocotrienols from Clusia pernambucensis and their activity against Leishmania (Leishmania) amazonensis.

A total of 5 tetradentate Schiff bases and their copper(II) complexes were tested for antioxidant activity. Descriptors calculated by hybrid DFT method provided insight into their antioxidant behavior and mechanism of the antioxidant activity.

Flower-like Ag-ZnO was more efficient than ZnO as photocatalyst for degradation of methyl orange. The possible factors influencing the photocatalytic activity were tested and discussed in order to find the best conditions.

With the addition of M1Ni_3.5Co_0.6Mn_0.4Al_0.5 (M1 denotes mischmetal) alloy, the cycle stability of AB₃-type La_0.78Mg_0.22Ni_2.67Mn_0.11Al_0.11Co_0.52 hydrogen storage alloy electrode is significantly improved. Moreover, the electrochemical kinetics increases first and then decreases with the increase of wt.% B.

Corroded polychrome lead sculptures from Oratory Museum (Ouro Preto, Minas Gerais, Brazil) were analyzed by different techniques. Environmental simulations supported that the degradation process was caused mainly by the curing process of the painted showcase baseplate, although cleaning products proved to be potentially harmful to Pb objects.

In this work, near-infrared reflectance spectroscopy and multivariate calibration for prediction of parameters (soluble solid and pH) were used in intact plum.

Estimated CBS-MP2 mean dipole polarizability vs. cluster size.

Phlogopitite is a rock that is disposed of as a byproduct of emerald mining in Brazil. It contains the mineral phlogopite, rich in potassium. Kinetic studies on potassium release in solution were conducted to evaluate this rock as an alternative potassium source for crops.

An experimental design of biodiesel constrained mixtures was employed to evaluate and optimize the oxidative stability of soybean biodiesel mixed with different amounts of tallow and castor bean biodiesels.

A solution of pure water at 10% (v v^-1) in methanol was used as the thermometric reagent (titrant) for the quantitation of metoxide in methanol solution. The temperature variation measurements were performed essentially using a thermistor. The data were collected and analyzed graphically in a computer.