JBCS

Optimization of extraction of phenolic compounds from Lippia alba (Mill.) N. E. Brown leaves by ultrasound and comparison with conventional techniques.

Deep eutectic solvent for extraction of copper from tea samples.

Magnetite nanoparticles-supported tannic acid capturing Cd^II and Pb^II from water.

The work presents a comparison of methodologies for the kinetic modelling of heterogeneous biomass pyrolysis, and shows a precise representation, with low deviations between theoretical and experimental curves.

This graphical summary illustrates the molecular structures of the three chiral molecules: ortho-hydroxybenzoic acid (O-HA), meta-hydroxybenzoic acid (M-HA), and para-hydroxybenzoic acid (P-HA). The left side shows the Raman spectral signals, while the middle compares experimental and theoretical Raman spectra, highlighting the recognition process. Finally, the right side presents their vibrational modes.

The graphical abstract shows a diagram linking Eugenia uniflora L. leaf extracts, antioxidant activity, and analytical techniques (total phenolic content (TPC), total flavonoid content (TFC), gas chromatography-mass spectrometry (GC-MS), and ultra-performance liquid chromatography-mass spectrometry (UPLC-MS)) used in this study as well as the molecular structures of the compounds found in this species.

Calcium carbonate derived from eggshells was added to arrowroot film, resulting in a polymer composite capable of preserving food.

Obtaining oil from urucum seeds by ultrasound-assisted extraction, Soxhlet, and steam distillation methods, characterization, and quantification.

The chemical investigation of the ethyl acetate extract from the brown seaweed Dictyota mertensii led to the isolation of prenylated guaiane and dolabellane diterpenes.

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.

A scientist is confused by the number of articles about marine organisms used as medicine and how they change over time. Talking to another scientist, they decide to write a review article to compile the data into a single document.

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.

Science Communication pieces created by undergraduate students were analyzed for the presence of the Structural Axes of Scientific Literacy. Results showed prevalence of chemical concepts and Science, Technology, Society, and Environment (STSE) discussions but indicated a need for further attention to Nature of Science.

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.

Innovation in Chemistry was investigated and some themes emerged, relating to the production of new materials, meeting energy demands, sustainability and human health.

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.