JBCS

Novel insights in the formation of different 2-substituted azlactone heterocycles. The formation of 2-aryl and 2-alkyl azlactones are favored by a sum of both kinetic and thermodynamic factors, while the cyclization of 2-alcoxy azlactones is less favored.

C₄-C₁₂ non-oxygenated volatile organic compounds and criteria pollutants were analyzed during the Rio de Janeiro Summer 2016 Olympic Games, in two Olympic zones, Maracana (Tijuca) and Deodoro.

The CeCu-mixed oxide catalyst calcinated at temperature of 650 °C took on the best performance with an oxidation conversion up to 98% for quinoline, a removal efficiency of 80.6% for total organic carbon (TOC) and a low Cu²⁺ leaching value of 19.3 mg L^-1.

AISI 316 and AISI 1020 steel coupons were analyzed by scanning electron microscopy (SEM) and atomic force microscopy (AFM) before and after immersion in various crude oil samples and their respective blends for 48 days at room temperature.

In this report, we described the optimization by response surface methodology of a new analytical method by gas chromatography (GC) for analysis of Alpinia zerumbet essential oil.

Mate extract in animal diet improves the redox status of meat by changing its metabolic profile towards the production of endogenous antioxidants.

Residual glycerol can be used as substrate in the production of valuable compounds by Klebsiella pneumonia in exponentially fed-batch cultures (EFBC).

Cocaine use in the Brazilian Federal District, assessed by wastewater-based epidemiology (WBE), revealed higher consumption in the north area, notably during weekends. A nationwide survey may be carried out with sewage samples adjusted to pH 2 and transported within three days under ambient conditions.

Persistent organochlorines were found in commercial Pericarpium Citri Reticulatae by a "push-and-pull" needle filter based cleanup and gas chromatography (GC) analysis.

Chalcone-quinolinone synthesis: one step reaction, good yield and pure precipitate.

A pictorial overview of the titration procedures for ethanol fuel employing manual and automatic approaches.

Incomplete and reproducible soluble inorganic phosphorus extraction from vegetable materials and foods prior to spectrochemical analysis in a flow injection analysis (FIA) system with zones penetration.

N-Alkylated sulfamic acid derivatives are introduced as promising acidic organocatalysts in multicomponent reactions to the synthesis of dihydropyrimidinones.

Molecular clusters are proposed as explanation for the different activities of betulinic and melaleucic acids, compounds with very similar properties.

The image summarizes the δ¹³C equation and the isotopic signature from different carbon sources in the Guanabara Bay, i.e., phytoplankton, mangrove trees, fossil fuel from boat traffic and industries.

Natural kaolin is efficiently converted, via dealumination and hydrothermal route, to Al-Mobil Composition of Matter No. 41 (Al-MCM-41) mesoporous materials, with a high area surface, showing high performance on methylene blue adsorption from aqueous medium.

Single-walled carbon nanotubes (SWCNT) are oxidized in acid medium under controlled NO₂⁺ concentration and reaction time.

The graphical abstract is an amplified structure of slow-release fertilizer. Microcapsule structure has disappeared after water soaking and the nutrient is slowly released completely.

Twenty 1,2,4-oxadiazole derivatives were synthesized and evaluated against five different bacteria.

In this study, the use of a biosorbent-based coating in solid-phase microextraction was proposed for the determination of polycyclic aromatic hydrocarbons in water samples.

Development, using chemometrics tools, of a hydrophilic interaction chromatographic method for the determination of gadodiamide in liposomes.

Determination of tetracycline, oxytetracycline, penicillin G and ceftiofur in raw milk by ultra-performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS) using protein precipitation as sample preparation: development, validation, and application in raw milk samples from dairy cows medicated with tetracycline (24, 48, 72 and 96 h after treatment) for subclinical mastitis.