JBCS

Comparative analysis of the composition of bio-oils prepared from agricultural waste (brewery residue, sugarcane straw, and banana straw).

To address the fuel cell cold-start bottleneck, a one-dimensional (1D) multi-phase stack model was developed, and the non-dominated sorting genetic algorithm (NSGA)-II was used to optimize coolant flow rate, positive temperature coefficient (PTC) heating power, and load rate for auxiliary heating strategies. The optimal solution (0.45 kg s^-1 coolant, 2375 W PTC, 0.02268 A cm^-2 load rate) cuts the minimum cold-start temperature to 247.15 K and significantly enhanced performance.

Gedunin-type limonoids obtained from wood residues were evaluated against promastigote forms of Leishmania guyanensis and L. amazonensis.

This study demonstrates the nondestructive testing technique of terahertz time-domain spectroscopy to detect melamine through common packaging materials. Distinct absorption peaks at 2.0 and 2.28 THz enabled quantification with high sensitivity.

Mid-infrared spectroscopy with attenuated total reflection and chemometric tools were applied to analyze flavonoids in extracts from 15 plant species through exploratory analysis and multivariate calibration.

Gelucire^® 50/13-based solid dispersions significantly improved the solubility of carbamazepine. The best-performing formulation was characterized physicochemically.

This diagram illustrates the anode electrocatalytic oxidation decomplexation pathway and the cathode electrodeposition process for nickel recovery in a system integrating electrocatalytic oxidation with electrodeposition technology for treating Ni^II-citric acid complexes (Ni-Cit).

The Graphical Abstract represents the monitoring of unsupported radionuclide, Cs-137, and the importance of designing an efficient, low-cost methodology with qualitative and quantitative rigor to meet nuclear and food safety criteria.

Controlled release system of curcumin encapsulated by chitosan and carried by green iron oxide (Fe₃O₄) nanoparticles to enhance curcumin bioavailability.

Gas chromatography coupled with mass spectrometry can be used to identify the coumarin brodifacoum in poisoned foods.

Hydrochloric acid (HCl) and hexafluorosilicic acid (H₂SiF₆) are used to extract copper as Cu^II from printed circuit boards, producing H₂ as a byproduct.

The study reports moisture determination in an engine lubricating oil using six different analytical strategies. It highlights the importance of controlling moisture in commercial lubricating oils to certify their quality and describes a forensic case study.

Pharmaceutical contaminants in water pose significant environmental risks. This study optimizes photocatalytic treatment using Ag/TiO₂ catalysts to degrade naproxen, diclofenac, and mefenamic acid. Effective degradation in brackish water achieved 90% degradation of naproxen within 10 h.

Corn processing generates a large amount of straw and cob. These lignocellulosic residues can be subjected to an organosolv pretreatment process with glycerol, aiming to obtain reducing sugars necessary for the production of cellulosic ethanol.

Biodegradable suture threads were synthesized from chitosan and powdered eggshell membrane, followed by preparation, suture thread formation, crosslinking with riboflavin, and chemical, morphological, and mechanical characterization.

The figure depicts a factory with the words “tannery/electroplating industry” above it is shown with an arrow coming out of it, representing copper, chromium, iron and zinc ions going into a shake flask with green liquid where microalgae are illustrated being cultivated.

The image shows schemes of an analog bubble-flowmeter and present warnings about its challenges (long analysis time, ergonomic risk) and shows its replacement with a digital bubble-flowmeter thereby eliminating the challenges.

Different density functional theory (DFT) / time-dependent DFT (TD-DFT) protocols for ultraviolet-visible (UV-Vis) spectra were assessed, optimizing functionals, basis sets, and solvation models for reliable geometric and spectral analysis of organic and inorganic compounds.

The kinetic study of 1020 carbon steel corrosion revealed zero-order kinetics for the HCl system and first-order kinetics for the HNO₃ system.

The angiotensin converting enzyme-I (ACE-I) inhibition of Vaccinium meridionale Swartz fractions and microencapsulates was evaluated, finding that anthocyanins are responsible for this activity.

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.

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

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.

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.

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 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.

A Matlab^® graphical user interface for exploratory data analysis (EDA) for users unfamiliar with the programming language.

The investigation of previous knowledge, as well as the stimulation of the anchoring of new information, enriches the teaching of chemistry, especially the teaching of chemical kinetics.

Three interrupted case studies, based on research articles, were developed and implemented in a scientific communication course.

Structuring concepts in organic chemistry through textbooks and university professors' perspectives. The image highlights key topics such as chemical bonding, stereochemistry, structure, and acidity-basicity, reinforcing the need for integrated conceptual understanding in teaching.

This research analyzes the potential of preparing Case Study statements in postgraduate chemistry courses as a means of incorporating the principles of critical Environmental Education.

The microtitration of iron in dietary suplements by dichromate is presented as a sustainable alternative method to classical dichrometry, with less exposure and minimizing the generation of toxic residues.

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.

Julius Robert Oppenheimer visited the city of Belo Horizonte in his first trip to Brazil in 1953. In an interview, he said "Brazil's future atomic industry should be located in Minas Gerais".

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.