JBCS

The city of Rio de Janeiro has a special atmosphere, as it is an urban region, surrounded by forests, mountains and the sea, which allows a series of chemical reactions from different types of sources.

Untargeted screening of microginin class cyanopeptides in cyanobacteria extracts by LC-MS/MS using precursor ion scan and structure elucidation based on high resolution mass spectra.

This image represents the whole process developed in this study, from the synthesis to the application of the photoluminescent ink in the sheets of paper.

Asarone-derived phenylpropanoids and isoquinoline-derived alkaloids were isolated from the bark of Duguetia pycnastera (Annonaceae) and reported for the first time in the species. The unambiguous assignments of the ¹H and ¹³C NMR data for nornuciferidine and guatterine N-oxide were described. Additionally, the cytotoxicity of the isolated compounds (except for nornuciferidine) was investigated by the Alamar blue assay.

Chemical, biological, and HPLC quantification studies showed that Fredericia speciosa, mainly the EtOAc-soluble fraction, is a rich source of bioactive flavonoids.

The common ionic strenght adjust used in voltammetric techniques causes a bias in the determination of pKa by line intersection methods.

Electrochemical impedance spectroscopy is proposed as a novel tool to monitor the glycerol/biodiesel gravity separation.

The RGB and Lab values of the solution to be measured were obtained using an image acquisition device and image processing software, while the color component and standard concentration were multiply fitted to obtain the measurement model for the determination of the vitamin C content in fruits and vegetables.

Natural organic matter (NOM) is a complex mixture of organic compounds that occurs in natural waters. The assessment of NOM characteristics is often carried out by fluorescence spectroscopy and UV-visible absorbance, and the measure of dissolved organic carbon (DOC).

Based on the need for determination of thiacloprid neonicotinoid in samples of analytical interest, the rational synthesis protocol regarding the chemical nature of the functional monomer (FM), stoichiometry (MM:FM) and solvent was optimized by DFT calculations.

Montmorillonite/biopolymer nanocomposites is a class of materials inspired in classic montmorillonite/polyamide nanocomposite and present new properties for application in different fields including antimicrobial materials and vehicle for drugs.

The approach here presented incorporates supramolecular approach, in which nanoparticles with well-controlled features conjugated with properly chosen molecules are the basis of functional organized structures for several applications.

An approach was proposed for authentication of organic oregano through the NIR and chemometrics.

A set of three experiments was developed and applied to undergraduate students of Forensic Chemistry dealing with visual inspection of apprehended formulations of anabolic androgenic steroids as well as chemical identification by Infrared Spectroscopy and Gas Chromatography-Mass Spectrometry. Moreover, the classroom evaluated the extraction of steroidal active ingredients by ultrasonic and microwave-assisted extraction.

This paper analyses 286 papers on Green Chemistry published in the Journal of Chemical Education regarding the relationships between Green Chemistry, Sustainability and Systems Thinking present in teaching approaches.

A well succeeded and useful flavonoid extraction experiment from citrus waste biomass employing common solvents for undergraduate experimental classes is described.

This work about training of chemistry teachers was guided by assumptions from the perspective of the teacher as researcher of the practice itself and by Pedagogy of Paulo Freire.

Big data patent analysis as an essential tool for the understanding of the technological maturity, competitors, and strategic intelligence for technologies in chemistry.