JBCS

In exposed geomembrane applications, polyethylene (PE) is in contact with ultraviolet (UV) radiation, and the degradation is led by photo-oxidation with several free radical reactions.

Volatile organic compounds extracted of Protium ovatum were collected in five different vegetation physiognomies of the Brazilian Cerrado and analyzed by GC-MS (gas chromatography coupled to mass spectrometry). Posteriorly, these were tested against Staphylococcus aureus, Escherichia coli, and Candida albicans. Chemometric tools were used.

Interpretation of physical-chemical and chemical shallow groundwater quality for human consumption, using statistical techniques.

Expired amoxicillin and penicillin V potassium tablets form a protective film on the surface of the lowcarbon steel, reducing the direct contact between the steel and the corrosion solution, thus alleviating the corrosion of the steel.

Analysis of the adsorption process of different pesticides using functionalized single-walled carbon nanotubes (SWCNT) using the AMBER/PM3 hybrid method and Monte Carlo simulation.

Compound 1^•+, which is the largest reported monoradical cation of thiophene-modified pyrene, has broad application prospects in the fields of semiconductors and optoelectronic materials.

Synthesis of Fe-TiO₂ from natural ilmenite and its application in the photodecomposition of aqueous cyanide (FeTiO₃).

Silicone rubbers were tested as passive samplers to determine the presence of third-generation antifouling biocides, commonly used as reinforcing agents in underwater paints. The chromatographic conditions provided an efficient separation and quantification of the analytes.

The pineapple peel biomass was subjected to chemical pretreatment experiments of organosolv delignification, and acid pretreatment with sulfuric acid (H₂SO₄) and hydrochloric acid (HCl), to enable the hydrolysis of hemicellulose and cellulose and obtain the fermentable sugars.

7-Chloro-1-ethyl-6-fluoro-3-(5-oxo-4-phenyl-4,5-dihydro-1H-1,2,4-triazol-3-yl)quinolin-4(1H)-one (11e) as a potential multi-targeting agent against cholinestaeses (AChE and BChE) and monoamine oxidases (MAO-A and MAO-B) for the treatment of Alzheimer’s disease.

High concentrations of ammonia in natural waters indicate pollution and environmental degradation. In this study, we propose a simple, rapid, and cost-effective voltammetric method for quantifying NH₃ in water samples using a non-modified Pt electrode.

High performance liquid chromatography-diode array detector (HPLC-DAD) and spectrophotometric methods were applied to determine bioactive phenolic compounds in Schinus terebinthifolia Raddi fruits. Antioxidant and antimicrobial activity were assessed. Metals were also determined by flame atomic absorption spectrometry (FAAS).

Electrospray ionization-ion trap mass spectrometry (ESI(-)-ITMS) and ultra-performance liquid chromatography coupled with electrospray ionization quadrupole-time-of-flight mass spectrometry (UPLC-ESI-QTOF-MS/MS) analysis of the fractions from leaves of Dipteryx lacunifera led to the annotation of twenty-one polar compounds (1-21). The antioxidant and cytotoxic potential of the ethyl acetate and ethereal fractions was also observed.

In this study, a simple, portable and low-cost analytical method for the determination of salycilic acid is presented. The reaction between the analyte and Fe^III ions is used for salicylic acid (SA) recognition, and the quantification is based on the color information extracted by digital images.

For the first time, the thermal and mechanical properties of the promising composition of ZnSO₄-B₂O₃-P₂O₅-Ho₂O₃ were determined.

A calibration procedure using internal standardization and matrix matching was established for lanthanides determination in tea by laser ablation-inductively coupled plasma mass spectrometry (LA-ICP-MS).

Considering the occurrence and availability of verboccidentafuran in the species Baccharis punctulata DC. and its structural similarity to curzerene, docking calculations were performed for the interaction of both compounds with the human α1-β2-γ2 GABA_A (gamma-aminobutyric acid type A) receptor.

Analysis of mono and sesquiterpenes from geopropolis powder by headspace-gas chromatography/mass spectrometry (HS-GC/MS) and analysis of di and triterpenes by GC-MS after ultrasound extraction.

The invention aims to improve the calibration of gas sensors not covered by a membrane using a system for mixing solutions with different gas concentrations.

The training of Chemistry teachers by higher education institution in the state of Goiás in relation to radioactivity presents gaps that reverberate in the teacher's performance in basic education.

How to interpret it? Perform a PCA (principal component analysis). And, how to interpret the PCA results?

We show in this study that there is a strong hierarchy in the field of chemistry in Brazil. The dominant pole consists of researchers with high scientific capital and prestige. On the other side, we identified researchers with fewer resources and possibilities of raising the hierarchy.

Practical electrochemistry activities seen from an accessible microscopic perspective: water electrolysis and steel corrosion.

A "mystery box" laboratory activity incorporating technological resources designed to engage pre-service chemistry teachers in exploring electrochemical concepts through a predict-observe-explain strategy.

One of the most important equations in the history of chemistry. It represents the culmination of decades of conceptual and experimental evolution in the field of electrochemical systems and still today stands as one of the pillars of modern electrochemistry.

Escalab is a chemical technology and innovation lab at Universidade Federal de Minas Gerais (UFMG) structured to take technologies to the market and connect academy-industry focused on scale up, business modeling and startup creation.

In the early 19^th century, the arrival of the Portuguese court in Brazil fostered an intellectual elite interested in science. This article illustrates their interest through the analysis of the works of Humphry Davy which appeared in Brazilian periodicals during that time.