JBCS

cis-Piplartine, piplartine and 4,5-dihydropiperlongumine isolated from leaves of Piper tuberculatum were active against Aedes aegypti larvae and have acetylcholinesterase (AChE) inhibitory activity.

Pallidine and other isoquinoline-derived alkaloids were tentatively identified in the trunk bark of U. rufescens through liquid chromatography coupled to tandem mass spectrometry analysis (LC-MS/MS) and fragmentation pattern analysis.

The modified flavonoids known as peltogynoids extracted from the wood residues of Peltogyne catingae Ducke ("roxinho") presented antifungal properties against Sporothrix schenckii and S. brasiliensis that cause feline sporotrichosis.

Optimization of the extraction of the 2'-fucosyllactose from human milk, finding experimental conditions including optimizing solvent (water) and centrifugation time for safe and rapid extraction.

Scheme of the process of copper ion absorption, transformation into copper hydroxide entrapped in the hydrogel and the absorption of furfural, one of the organic compounds present in vinasse.

A composite photocatalyst, xTCN, was synthesized using a simple one-step hydrothermal method, with H₂O₂ as the oxidant. This approach effectively reduced the bandgap energy and minimized the recombination of photogenerated carriers. The bandgap structure of g-C₃N₄ was modified by the incorporation of an O atom, improving the separation efficiency of the photogenerated electrons and holes.

Novel imides were synthesized from (E)-2,3-dihydro-1H-inden-1-one oxime via Beckmann-like rearrangement with nucleophilic catalysts. Molecular docking indicated that derivatives 5i, 5g, and 5h showed promising acetylcholinesterase inhibition compared to galantamine.

Tyrosol derivative compounds isolated from Actinomucor elegan fungus show good antimicrobial activity against  Xanthomonas bacteria which causes bacterial spots in passion fruit.

Saponins and glycosylated steroidal alkaloids were isolated from the hydroalcoholic extract of aerial parts of Solanum jabrense Agra & M.Nee, identified and characterized by nuclear magnetic resonance (NMR), infrared spectroscopy (IR), mass spectrometry (MS) and optical rotation.

The graphic shows Penicillium citrinum CBMAI 1186 reducing α,β-unsaturated ketones to γ,δ-unsaturated ketones at 32 ºC and 135 rpm. This demonstrates the regioselective and chemoselective efficiency of the strain, highlighting its potential as a biocatalyst.

Methyl trans-ferulate was converted into the dihydrobenzofuran neolignan trans-dehydroferulate dimethyl ester with good enantioselectivity using an advantageous approach based on Trametes versicolor FC.

The phytochemical study of Trichilia hirta Linneaus (Meliaceae) seeds resulted in the isolation and identification of a new limonoid named Hirtinol A, in addition to a mixture of 21α-melianone and 21β-melianone, and the glycoside schumaniofioside A.

Bioactive hexane extract from leaves of Piper crassinervium was subjected to a bioactivity-guided fractionation to afford five metabolites (1-5). Compound 5 is previously undescribed while compounds 1, 2 and 4 are being described for the first time in P. crassinervium. Compounds 1-5 were evaluated against trypomastigote forms of parasite Trypanosoma cruzi whereas their toxicity was evaluated against NCTC cells.

Schematic diagram of the procedure used. It consists of a glassy carbon electrode modified with graphene oxide and zinc stannate and a potentiostat/galvanostat coupled to a computer and can be used for the analysis of promethazine hydrochloride.

The study investigates thermoplastic starch (TPS) biocomposites with ucuuba fibers, focusing on the effect of buriti pulp oil. This oil improved the matrix, decreasing hydrophilicity and slightly increasing strength, while rheological and scanning electron microscopy (SEM) analyses confirmed better plasticization and enhanced thermal stability.

Seven compounds, belonging to the flavonoid, phenylpropanoid and chromone classes, were isolated from the leaves of Eriodictyon californicum. Among the isolated compounds, ethyl cinnamate (6) and 5-hydroxy-7-methoxychromone (7) are being reported for the first time in E. californicum and in the Boraginaceae family.

The analysis of essential oils from three Thunbergia species revealed differences in their chemical profiles, but all contained sesquiterpenes as the predominant compounds. The oil from T. erecta demonstrated the highest efficacy in the DPPH (2,2-diphenyl-1-picrylhydrazyl), ABTS (2,2-azino-bis-3-ethylbenzothiazoline-6-sulphonic acid), AChE (acetylcholinesterase), and BuChE (butyrylcholinesterase) assays.

The fragmentation of deprotonated aspidospermine, aspidocarpine, demethoxypalosine, and aspidolimine was investigated in this work using negative electrospray ionization tandem mass spectrometry.

Tabernaemontana hystrix (Apocynaceae) root bark showed antiproliferative potential against the HeLa cell line. Six alkaloids were isolated from EtOAc or BuOH fractions. Compounds 3 and 4 are being reported for the first time in the species, and compound 6 is new in the literature.

In the research, a bio adsorbent was produced as an alternative to textile wastewater treatment and could act as a tool for recycling dyes and saving water. This process would reduce the costs of dyeing fabrics by obtaining a new "ecological dye" for subsequent tanning.

A phytochemical investigation of the aerial parts of Pavonia malacophylla resulted in the isolation and identification of eighteen compounds, revealing antimicrobial potential in its extract, fractions and isolated compounds.

Main databases used to search for articles about Remijia, and some of their biological activities and chemical substances.

Fragmentation from electrospray ionization tandem mass spectrometry (ESI-MS/MS) analysis of caramboxin, a natural toxin, was explored using computational chemistry.

Chemical concepts behind fingerprints addressed through a forensic situation, in order to arouse students' interest and curiosity during teaching.

Integration between teaching, research and extension, pillars of the 1000 Future Scientists program, highlighting the importance of university extension in the articulation between academic knowledge and teaching through social practices.

Radioactive sources are widely used in modern society but are not widely known by the lay public. Unfortunately, these materials can be stolen and can cause serious problems to society. Assessing this kind of event is only possible if nuclear chemistry and radiochemistry concepts are recognized.

Mapping the landscape of early-career researchers in chemistry across Brazil, highlighting demographic trends, research productivity, and challenges.

Overlay of the different formats (2025 versions) of the periodic table of the elements of the Brazilian Chemical Society: in the background, the front of the A4 format, overlaid in sequence by the poster format and the digital format.

Oswaldo Sala played a pioneering role in the introduction and development of vibrational spectroscopy in Brazil and Latin America. His trajectory is here detailed, from his hiring by USP (IAG 1949) to the consolidation of his research group at IQUSP, from 1969 onwards.