JBCS

Chalcones, triterpenes, sitostenone, and very-long fatty acids were isolated from bioactive extracts of Bowdichia virgilioides’ roots.

This study sought to develop an HPLC (high performance liquid chromatography) methodology to quantify the two main protein fractions of whey protein concentrates (WPC) in liquid and powdered form before and after microparticulation and at various protein concentrations. Additionally, we calculated the denaturation percentage of each protein fraction.

This graphical abstract shows the ultraviolet-induced visible luminescence (UVL), infrared (IR) images and elemental maps Pb-L, Fe-K and Zn-K obtained in investigation of the painting "Costureiras", by Tarsila do Amaral, from 1950, oil on canvas, measuring 73.3 × 100.2 cm from MAC-USP Museum Collection.

The quartz crystal microbalance (QCM) gas sensor based on polyaniline nanofibers has ultra-sensitive moisture-resistant detection capability for benzene, toluene, ethylbenzene, and xylene (BTEX) vapors.

Chromium VI is a highly toxic species and must be controlled in organic fertilizers. A simple spectrophotometric method was developed and validated for its determination.

Bulk precipitation samples collected at two coastal urban sites (downtown Niterói and APA Guapimirim) in the Metropolitan Region of Rio de Janeiro and at two montane Atlantic Forest (at 400 and 1000 m altitude) areas within Serra dos Órgãos National Park (PARNASO) were investigated for inorganic ions.

By injecting ozone microbubbles, it can effectively remove Fe²⁺ in CO₂-rich mineral water to prevent sediment from occurring during storage and increase shelf life.

Vehicles emit air pollutants, such as volatile organic compounds (VOC) and nitrogen oxides, which in the presence of sunlight, lead to the ozone formation. As ozone is the main product, it is a parameter used to control vehicular emission.

The reinjection of CO₂ into oil reservoirs as a mitigation project can influence asphaltene molecules. These structures can aggregate, precipitate, and cause several problems in the oil industry.

A new pelletization proposal allowed, from the solid state synthesis between the clay mineral palygorskite, lignin (paper pulp residue) and WAX^®, the application of the composite in environmental remediation, removing 88.36% of Pb^II ions in 60 min and in batch system.

Comparison of fatty acids and triacylglycerols in human, cow, and goat milk as a basis for supplementation in infant formulas.

By using TiCl₄ as the titanium source, we systematically determined the degree of hydrolysis of Ti⁴⁺ by adding triethanolamine (C₆H₁₅NO₃) dropwise. By collecting solutions at different time points and performing UV spectroscopy analysis, we plotted the Ti⁴⁺ concentration over time. This study not only reveals the hydrolysis behavior of Ti⁴⁺ under different conditions, but also provides a theoretical basis and experimental method for the precise control of the hydrolysis process of Ti⁴⁺. Such research results have important guiding significance for the preparation and application of titanium-based materials.

Ultra high temperature (UHT) processing promotes a series of heat-induced changes that can lead to colloidal destabilization of milk. Through physical-chemical analyses it is possible to evaluate and compare the colloidal systems of commercial UHT milk samples.

Established in 1973, Brazil's National Immunization Program (NIP) is one of the largest in the world. It conducts physicochemical assays, continually improving techniques to ensure vaccine safety and efficacy.

Based on the quartz crystal microbalance (QCM) platform and utilizing CeO₂ nanorods as the sensitive material, a superior carbon monoxide sensor has been systematically developed for the first time.

The thermal decomposition of nitro compounds was analyzed by differential thermal method and thermogravimetric method, the apparent activation energy was calculated and the reaction type was verified, the molecular structure was optimized by quantum chemistry method, and the Mayer bond sequence was calculated to verify the thermogravimetric experiment results.

The graph summarizes the change in the morphology of the electrodeposited coatings as a function of the percentage of Sb. The corrosion tests complement this effect in a neutral medium.

The orange peel was treated and used for extraction by dynamic maceration with a 7:3 (v/v) EtOH/H₂O solution, where a green chromatographic method was developed using bioethanol and water to identify compounds such as hesperidin.

In this study, the aquatic toxicity of some chemical compounds present in hydraulic fracturing fluids was estimated through quantitative modeling of structure-activity relationships for the evaluation of risk potential in inland water fish: Pimephales promelas, Oreochromis niloticus and Oncorhynchus mykiss.

Boldine alkaloid bonded to farnesoid X receptor: a possible molecular target of cholagogue and choleretic activity of Peumus Boldus.

Dyes of natural origin are an inspiration for the development of new molecules. Several computational methods can be used to deepen knowledge of these compounds' photophysical properties, from methods based on quantum mechanics to machine learning strategies.

A workflow for analytical procedures promoting quality control and quality assurance in untargeted metabolomics.

Molybdenum disulfide (MoS₂) occurs in three polymorphic/polytypic structures (1T, 2H and 3R) but only the polymorph 1T and the distorted phases 1T', 1T" and T"' present metallic properties and several applications in the most diverse areas.

Adsorption Kinetics Calculation (AKC) is a new free, easy-to-use software that uses non-linear equations to calculate adsorption kinetics parameters with precision, fast performance and a user-friendly interface.

Wax lipids primarily consist of aliphatic acyclic compounds, which are often misidentified by Standard Digital Libraries. WaxAlly is a new software developed to assist in identifying the mass spectra of the main classes of wax lipids.

The construction of arguments by solving experimental problems with the help of the heuristic diagram.

Ana Rosa Kucinski Silva, lecturer in the Department of Chemistry at the University of São Paulo, was kidnapped and murdered in 1974 by the Brazilian military dictatorship (1964-1985). Very little is known about her academic activities. This work aims to contribute to fill this gap.

Essential facts and circumstances of José Israel Vargas' outstanding career, over seven decades, are highlighted. These comprise his scientific research time at Centre d´Études Nucléares de Genoble (CENG), France, his work at Federal University of Minas Gerais (UFMG), and his lively involvement in ruling Brazilian science policy.

This study explores how bioactive substances are depicted in popular culture, particularly in cartoons and games, through the perspective of Medicinal Chemistry.