JBCS

The image shows the calculated structure of the bicyclobutonium cation on the zeolite Y structure, highlighting the hydrogen bond interactions with the framework oxygen atoms.

Liquid products from hydrocracking of babassu oil with NiMo/alumina catalyst, as analyzed by gas chromatography, showed a highly selective transformation of fatty acid moieties present in the original oil to a mixture of saturated linear hydrocarbons. The presence of both even and uneven C number in the products implies that two reaction mechanisms occurred: deoxygenation without C-C bond breaking and decarboxylation/decarbonylation.

Chromatogram of blank plasma sample spiked with fluoxetine (FLX) and norfluoxetine (NFLX), resulting in 500 ng mL^-1, after protein precipitation step and liquid chromatography-fluorescence detection analysis.

A three-dimensional plot of the first three principal components from biodiesel data. It is possible to distinguish, in each model, three different groups of samples: cotton, castor and palm biodiesel.

A one-pot three-component condensation of 3,4-methylenedioxyphenol, aromatic aldehydes and
1,3-dimethylbarbituric acid, efficiently promoted in the presence of Zr(HSO₄)₄ under solvent-free conditions, produced 10-aryl-6,8-dimethyl-6,10-dihydro-5-oxa-6,8-diazaanthra[2,3-d][1,3]dioxole-7,9-diones.

The article presents the individual and equimolar mixture of DNA nucleotide detection using square wave voltammetry on boron doped diamond electrodes cathodically and anodically pre-treated.

The reaction of amines with FMOC-Cl. Etimicin uses precolumn derivatization (PCD) with 9-fluor-enylmethyl chloroformate (FMOCCl) by a reversed phase separation and subsequent fluorescence detection.

The reversed phase HPLC method was developed and validated for Pramipexole dihydrochloride in bulk drugs and in pharmaceutical dosage form in the presence of degradation products. The detection was carried out at a wavelength of 260 nm. The Pramipexole was subjected to stress conditions of hydrolysis, oxidation, photolysis and thermal degradation

Various natural terpenes are converted to the corresponding allylic chlorides in good to excellent yield, using MoCl₅ /NaOCl system under mild conditions.

The dissolution of the oxcarbazepine was carried out utilizing a dissolutor and different parameters in 18 experiments which lead to the plotting of a surface response graph. This allowed establishing the best conditions for the test.

4-NimMeBr was adsorbed on the MWCNT modified electrode thus permitting the implementation of an adsorptive stripping voltammetric (ASV) method.

3-O-acetylceanothic acid, a new natural ceanothane triterpene together with the known metabolites ceanothic acid, ceanothenic acid, betulinic acid, discarine B and chrysophanein, were isolated from the root extract of C. greggii var. yucatanensis and evaluated for their antiprotozoan, cytotoxic and anti-proliferative activities.

New series of anthracenylpyrazolines and anthracenylpyrimidines were synthesized from 3-(anthracen-9-yl)-1-aryl-prop-2-en-1-one derivatives and spectroscopically characterized. The compounds were evaluated for their antibacterial and antifungal activities.

Electrochemical filter-press-type reactor used for dye removal.

Evolution of the phenolic content of the cachaça during aging in oak barrel, where the phenolic compounds were analised by HPLC and spectrophotometric analysis.

A modified electrode (by incorporation of carbon nanotubes with p-aminophenol as a mediator) was used as voltammetric sensor for the determination of captopril. The modified electrode has high electrocatalytic activity for captopril oxidation at pH 6.0. The voltammetric sensor was successfully applied for the determination of captopril in drug and urine samples.

H₆GeMo₁₀V₂O₄₀•16H₂O nanoparticles, as a new heteropoly acid, have been prepared through hydrothermal method and have been used as an efficient heterogeneous catalyst for rapid and selective acetylation of alcohols and phenols with acetic anhydride under solvent-free conditions at room temperature.

The chalcones were incubated in culture medium to produce the corresponding dihydrochalcones. The bioreduction was regioselective, occurring only in the carbon-carbon double bond of the α, β-insaturated ketone system.

FTIR spectra of Xac cells cultivated with (red) and without CuSO₄ (black). The strong peak (red) at 1650 cm^-1 in related to the production of pyruvated exopolysaccharides, by the cells, to bind and reduces the copper toxicity.

The occurrence of prenylindole alkaloids in Raputia species provides a better understanding of the chemotaxonomic relationships between Raputia and Neoraputia genera.

Polycyclic aromatic hydrocarbons (PAHs) are organic contaminants, which occur in air, soil and food, from incomplete combustion or pyrolysis of organic matter. In edible oils, the presence of PAHs is mainly attributed to the smoke drying of the oil seeds, during oil production.

The copper surface immersed in near-neutral aerated tap water shows an increasing film thickness with time that hinders the diffusion of copper species across the oxide layer, which is larger in stagnating condition.

Pyrimethanil, pirimicarb and buprofezin are pesticides used in a variety of cultures and this work showed which one can be determinated in surface waters from irrigated area. The samples were collected from the irrigated regions of Sergipe and Pernambuco States, Brazil, and were prepared by solid-phase microextraction (SPME).

A series of dihydropyrimidin-2-ones/thiones synthesized by a new environmentally-friend method showed, for the first time, antiproliferative activity against human U118-MG and rat C6 glioma cell lines. Some compounds were more cytotoxic than monastrol.

The Heck reaction of trans-stilbene derivatives with aryl halides in order to obtain substituted triarylethenes is described. Findings concerning the influence of halide or olefin electro-donating and withdrawing groups on activity, regio- and stereoselectivity of the Heck reaction are also reported.