JBCS

Ionic liquid-based dispersive liquid-liquid microextraction (ILs-DLLME) followed by high-performance liquid chromatography (HPLC) under ultrasound assisted extraction was established as an effective analytical technique for the determination of Silybum marianum.

The flowchart outlines the principal steps and key aspects of the proposed prediction model utilizing artificial intelligence (AI) for the electrodeposition of zinc on low carbon steel substrates.

Tomato (L. esculentum Miller) cultivated in soil contaminated with fluorescent lamp powder absorbed potentially toxic elements, leading to its adaptation and the production of 5-O-feruloylquinic acid.

The proposed method aims at the multiresidue determination of pesticides from various classes in açaí pulp using a fast and efficient method based on modified QuEChERS (quick, easy, cheap, effective, rugged, and safe) and UHPLC-MS/MS (ultra-high performance liquid chromatography with tandem mass spectrometry).

Modifying the surface of TiO₂ with phosphate (PO₄^3-) increases the number of hydroxyl groups on the TiO₂ surface. This enhancement provides numerous Lewis basic sites that promote the adsorption and activation of CO₂. Additionally, the creation of P-O-Ti electron transfer channels aids in the crucial intermediate *COOH, improving the CO production efficiency.

Natural extracts of coffee leaves, yerba mate and jambolan pulp were evaluated, in the presence and absence of metallic ions of manganese, chromium and cobalt, in mixture with biodiesel.

Nitrosyl ruthenium complexes containing polypyridyl ligands were characterized and presented antibacterial action against Pseudomonas aeruginosa.

Evaluation of natural photodegradation in a semi-arid climate in the Sertão region of Pernambuco of pure poly (butylene adipate-co-terephthalate) (PBAT) films and additives with 5% of clove essential oil (Syzygium aromaticum (L.) Merr.).

The influence of different pressures of homogenization during the production of whole milk powder with crystallized lactose on free fat content and particle size.

The process begins with the collection of rice and rice husk. Through chemical processes, silica is extracted and subsequently adsorbed onto the bacterial cellulose membrane, which can be used for the controlled release of silica into the soil.

Propanol, butanol and pentanol were used as raw materials to obtain high-value products through the Guerbet reaction, using heterogeneous catalysts such as mixed metal oxides with copper.

This is a representation of a test well where a ceramic artifact was located and this fragment was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray fluorescence spectroscopy (FRX), X-ray diffraction (XRD) and optical microscopy to determine composition characteristics and manufacturing method of the piece.

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

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.

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.

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 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.

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.

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.

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.

Stereoselective synthesis of α-aryl enaminones was developed by TfOH-promoted cascade reactions via 1,3-dipolar cycloaddition of alkyl azides with dibenzylidene ketones, aziridine formation, and 1,2-aryl migration. Starting materials are readily available and TfOH is easy to handle.

An alumina supported NiNb metal oxide prepared from hydrothermal method was successfully applied for ethane oxidative dehydrogenation (ODH) to ethylene. The hydrothermal method led to the feasible formation of active sites over the NiNb sample, which presented the highest selectivity toward ethylene due to the special nature of surface oxygen with low reducible sites.

Compounds 2 and 4 are novel via bromination. Compound 2 has inhibited well against Staphylococcus aureus and Bacillus cereus bacteria with minimal inhibitory concentration (MIC) values of 13.20 and 6.6 µM, respectively, and 2 inhibited stronger than parent compound 1.

Multivariate curve resolution is used to quantify the content of palm oil methyl biodiesel in diesel blends. This tool recovers the pure profiles of analytes in complex mixtures, managing to determine the concentration of the species of interest even in the presence of interferents.

KBiO₃ and BiOCl form the p-n heterojunction that makes the photo-induced electrons and holes efficiently separated and the recombination of electron-hole pairs hindered under visible light. Therefore, the photocatalytic effect can be greatly improved.

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.

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

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

N-Sulfonyl-1,2,3-triazoles obtained by "click" reactions are in equilibrium with acyclic diazoimines. In the presence of transition metals, these species generate α-imino metal carbenes, which are versatile species in the synthesis of alkaloids.

This graphical abstract summarizes the key topics of the review article. The process of raw biogas contaminated with siloxanes involves three critical steps: sampling, analysis, and purification. These steps result in purified biogas, which can be used for various applications.

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.

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

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.

The scheme shows the image of the constructed photoreactor, with its main characteristics inside a circle that represents the colors of the visible spectrum.

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.

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.

Benzyl isothiocyanate (BITC) is a bioactive compound formed in papaya seeds from fruit lesions. The state of Espírito Santo stands out in the cultivation of this fruit. The context was used to address and apply chemical knowledge in the training of chemistry teachers.

Six categories of arguments proposed by prospective teachers on the importance of Chemistry in the secondary school curriculum and its implications for chemistry teacher preparation in Brazil.

The acetylsalicylic acid produced in the experimental classes, which would typically be discarded, is recycled through purification and characterization for later use as a fingerprint developer.

Graphical summary of the theoretical aspects (one-pot synthesis) that will be explored in this work, which aims to contribute to the chemistry teaching in Brazilian higher education.

Chemistry education focused on citizenship education, ethics in interpersonal relationships and mainly criticism of social and cultural inequalities.

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

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

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.

In this article, we present a ChemTech acceleration program where the academic participants (researchers and students) develop entrepreneurial skills while taking their chemical technologies from universities to the market/industry.

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.