JBCS

Several novel cyclophanes were synthesized by esterification reactions under high dilution conditions. Some of these compounds have low antifungal or antibacterial activities

Essential oils were used to study the spatial structure of eight Eugenia dysenterica populations in central Brazilian Cerrado. Differential patterns can be explained by the distinct spatial rearrangement of the populations and may contribute to the species management and conservation based only on oil chemovariations

Feeding experiments using ¹³C-labeled precursors were performed aim at investigating the biosynthesis of two dihydropyrrole-polyketides isolated from a marine-derived Penicillium citrinum. The results showed that the biosynthesis proceeds from acetate, methionine and ornithine

Thiophene adsorbed on NiMoS and CoMoS catalysts was studied with density functional theory and a topological approach to probe electronic modifications. The origin of the promoter effect, an enhancement of hydrodesulfurization activity due to weaking of metal-sulfur bond strengths, was explained

Fast and low-cost methodology for the determination of sildenafil in different types of pharmaceutical samples using a flow injection analysis (FIA) system with multiple pulse amperometric detection on a boron-doped diamond electrode is presented. Excellent reproducibility and high analytical frequency were obtained under these conditions

Bare porous silica nanoparticles induce hemolysis in human red blood cells, while protein coated nanoparticles resulted from their interaction with blood plasma (the so called protein corona effect) completely prevent the hemolytic effect

Metabolites were monitored during jabuticaba fermentation by ¹H nuclear magnetic resonance and spectrophotometric assays. Multivariate methods revealed the influences of alcohols and organic acids on the extraction and stability of phenols and color properties

The chemical composition of copaiba oils (Copaifera multijuga Hayne) is affected by soil characteristics, but not seasonality or diameter at breast height (DBH). Cluster analysis shows that caryophyllene and its oxide form the main groups

A fast method for naproxen determination in pharmaceutical formulations using batch injection analysis with pulsed amperometric detection is presented. High analytical frequency (90 h^-1), satisfactory accuracy and low limit of detection (0.3 µmol L^-1) were obtained

N-substituted phthalimidoalkyl 1H-1,2,3-triazoles were obtained in good-to-excellent yields (67-98%) through click chemistry protocol (Cu-AAC) at room temperature using DMF, Et₃N under ultrasound irradiation

Essential oil chemovariations in the genus Hypenia suggest that cadinanes and bicyclo-germacranes/aromadendranes are chemomarkers of sections Densiflorae and Laxiflorae, respectively

Four new 7,8-secolignans (neglectahenols A-D) were isolated from leaves and stems of Schisandra neglecta, and neglectahenols A-D showed modest anti HIV-1 (human immuno-deficiency virus type 1) activities with therapeutic index (TI) values of 58.65, 26.36, 23.71 and 25.85, respectively

The temperature programmed reduction analysis of LaNiO₃ and LaNiO₃/Al₂O₃ showed that the Ni³⁺ of perovskite structure reduced in two steps and the peaks correspond to successive changes in the structure, which are related to reduction: Ni³⁺ to Ni²⁺ and Ni²⁺ to Ni⁰

The use of cyanobacteria to decolorize and possibly to degrade eleven types of textile dyes was confirmed by mass spectrometry and resulted in completely textile dye remotion

The effect of solar radiation in the complexation capacity of aquatic humic substances (AHS) with Al³⁺, Cr³⁺, CrO₄^2- and Ni²⁺ was evaluated. AHS were extracted and characterized employing conventional techniques

Asphaltic materials recovered from a subsea petroleum production flowline during a pigging operation in Santos Basin, Santa Catarina State, Brazil

The article studies the electrophoretic behavior of the most frequently used fluoroquinolones (structurally related ciprofloxacin, norfloxacin and ofloxacin) in order to achieve their simultaneous separation from complex mixtures, by means of capillary zone electrophoresis respectively MEKC

Experimental boiling point numbers (Y_BP) of alkynes can be used to evaluate literature boiling point data, and Y_BP values calculated from simple structure counts can be used to predict alkyne boiling and flash points

ZnS nanoparticles were deposited on montmorillonite forming a stable nanocomposite, which was used as a catalyst for the photodecomposition of phenol. Reaction kinetics agreed with the pseudo-first reaction model confirming that the high amounts of hydroxyl radicals were produced. The catalytic activity of montmorillonite was not observed

Thermal processes applied in foods can lead to a loss of their nutritional quality due to the oxidation of their polyunsaturated fatty acids. Thus, the main objective of the present study is the absolute quantification of fatty acids from cow and goat powdered milks, through the application of gas chromatography with a flame ionization detector (GC-FID)

This work describes the seasonal distribution of important constituents of PM10 particles (particulate matter less than 10 μm in diameter; major ions and trace elements) in Sao Paulo Megacity, Brazil. Predominant sources were fuel burning, biomass burning, gas-to-particle conversion and sea salt spray

Two new quinonoids and a new neolignan were isolated from stems of Chirita longgangensis var. hongyao

Five new compounds were isolated from the leaves of Deguelia utilis. A fraction containing all flavonoids was available to determine its neuroprotective action

Three new labdanes methyl 8α,15-epoxylabdan-16β-oate, 8α,15-epoxylabdan-16β-ol and 8α,15-epoxy-16-norlabdan-13β-ol together with three known 8α,15-epoxylabdanes and two triterpenes were isolated from Eragrostis viscosa. 8α,15-Epoxylabdan-16β-ol was shown to be the most cytotoxic of the compounds tested