JBCS

With the reaction the PCBs are partially dechlorinated, forming less chlorinated congeners and aryl glycol compounds by the chemical bonding to the polyethylene glycol.

CO₂ sorption using ionic liquid ([mbmim][Tf₂N] and [bmim][BF₄]) with glass microspheres K20 as surface area extenders.

A simple fluorescent sensor L showed good selectivity toward trivalent metal ions (such as Al³⁺, Fe³⁺, Cr³⁺, La³⁺ and Ce³⁺) over other monovalent or divalent metal ions.

The protonation of the carbonyl moiety in the succinic acid activates the carbonyl carbon atom for nucleophilic attack of n-butanol followed by the desorption of the succinic acid monobutyl ester. After a new esterification process, the generated dibutyl succinate separated from the surface active sites of the catalyst.

A new formulation for controlled drug delivery from water-swellable matrix systems was proposed.

Aldol condensation of furfural with acetone catalyzed by amines.

Computational screening of solvents through full SMD calculations can be an useful approach for finding the best solvent of a chemical reaction.

Waste and residual triacylglycerols can be a valuable feedstock source to produce biodiesel. One of the main chemical aspects of quality is the oxidative stability of FAMEs during of storage process. We evaluate some specific conditions that can promote it.

Extraction and pre-concentration of pesticides in surface water samples by SPE-HPLC-UV, using a low-cost lab-made SPE sorbent.

Seven compounds were isolated from Casearia arbórea using chromatographic methods and the antimicrobial activity of kolavelone, a clerodane diterpene, was evaluated.

A novel helicate [Fe₂L₃]⁴⁺ resulted from the subcomponent self-assembly of a C₃-symmetric triamine, iron(II) and 2-formylpyridine. The supramolecular studies showed that the size, functional group and symmetry of guest molecules remarkably influenced the host-guest interaction patterns.

Allantoin was encapsulated with galactomannan extruded from Delonyx regia.

Dye sensitized solar cell (DSSC) can be prepared with natural dyes, such as Hibiscus. Photovoltaic parameters and a model capable of predicting the adsorption mechanism of the dye on the TiO₂ surface are investigated in this paper.

Chemical compositions of the propolis of Apis mellifera and Frieseomelitta longipes and determination of their biological activities.

Triazolic derivatives of eugenol were prepared and had their cytotoxicity evaluated.

Waste seed oils of Spondias mombin presents mostly unsaturated fatty acid, phytosteroids and two new alkenyl phenols.

This work shows the use of lemon varieties as natural reducing agents for the preparation of gold nanoparticles from two different metallic precursors. UV-Vis spectra of the red colloidal solutions show bands at ~ 520 nm corresponding to particle sizes of 5-25 nm.

The article describes the incorporation of the yttrium aluminum oxide doped with Yb³⁺ and Er³⁺ incorporated into polyamide membrane obtained by Additive Manufacture. This work presents potential applications to transform infrared radiation into visible, upconversion.

Potential energy variation for triethylaluminum combustion under different temperatures in NVE-MD simulations.

Samples of biodiesel were first exposed to an accelerated oxidation process and then thermally decomposed. The final mass measured on the weight loss curve was used for assessing its oxidative level.

The oil is made up of organic and inorganic components, in which identified and quantified through chromatographic analytical techniques and atomic spectrometry, which assists in the evaluation of the type of its generating rock and its depositional paleoenvironment.

We advance a computational strategy for the choice of sensing phases based on polymer matrices, for organic contaminants in water. This strategy was employed to evaluate a novel sensing phase of polyurethane, which was effective in determining toluene contaminant in water samples.

A user-friendly and economical UV-spectrophotometric method was described to determine L-DOPA content in extracts from 33 biotypes of Phaseolus vulgaris L. The method is based on the nitrosation of L-DOPA to form a yellow solution and then formation of a red solution by adding base which is measurable at 470 nm.

The dienamides synthesized were evaluated against the insect pest Ascia monuste, the natural enemy, and the pollinator. The dienamides were toxic to the pest and were selective in favor of the natural enemy and pollinator.

Immobilization of β-galactosidase on galactose modified ANPs for hydrolyzing lactose.

Nine derivatives were prepared from carvacrol/thymol. The structures were confirmed by MS, IR and NMR, and acetylcholinesterase and larvicidal tests were performed.

Water contamination cycle caused by paraquat pesticide, which can be prevented by using nanocomposite hydrogels based on polysaccharide and zeolite as proven by the UV-Vis spectrum of paraquat solution indicating their sorption into absorbent materials.

ZnO NPs and Zn MCs were incorporate to Ecoflex^® by the extrusion process, obtaining the biodegradable antimicrobial polymer. This property was proved by the death curve test, with better results to the Zn MCs + Ecoflex^®.

EEF and EAF showed similar profiles by HPLC, with the presence of three flavonoids: myricitrin (1), quercitrin (2) and afzelin (3). In assay of TBARS and ABTS radical cation, EAF showed antioxidant potential higher than the EEF.

The results showed that HPLC can be used as a powerful technique to monitor and characterize more complex reactions involving metal complexes such as nitrite/nitrosyl interconversion in ruthenium bipyridine complexes.

Lanthanoid organic frameworks (LOFs)* stand out as an important class of functional materials due the optical, magnetic and redox properties. The main properties of these materials as, sensors, catalysis, luminescence and so on, is described in this review.

The spread of PBDEs is a subject of recent concern due to their adverse effects and persistency. Thus, it is important to assess their concentrations in different matrices in order to better understand their behavior and fate in the environment.

Representation of a virtual screening procedure using a sequence of different filters (drug-like properties, pharmacophore or shape, similarity and docking) applied to a virtual database of molecules previously prepared.

This review summarizes recent developments, in the last twenty years, about the Ferrier rearrangement reaction involving synthesis, mechanistic proposal and application of 2,3-unsaturated O-glycosides.

Bacteria, fungi, yeast and Trypanosome biomineralizations play a critical role in biogeochemical cycles. These processes have important technological and environmental applications. This review shows the recent progress in biogenic magnesium phosphate compound.

Medical applications of polyurethanes.

Leaching of spent lithium-ion batteries under mild experimental conditions using weak and strong acids. Co(II) was extracted by D2EHPA at pH ~5. Lithium salts can be directly precipitated from the raffinate.

Environmental friendly methods for regioselective iodination of the 3,7,3',4'-tetramethoxy-quercetin. Neat reation and aprotic polar solvent selective C-6, protic polar solvent selective C-8 and excess iodine reagent selective di-iodination.

GlassPanacea is an efficient software tool for ceramic materials formulation, providing the users with flexibility in the selection of chemicals, as well as speed and accuracy in the calculation of their relative proportions in a batch. The software is freely available from http://www.certev.ufscar.br/research-1/glasspanacea-glass-and-ceramic-formulation-software.

A didactic alternative approach is proposed for deducing molecular orbital topology of acyclic and cyclic conjugated polyenes, relative energies, and orbital degeneracy to cyclic polyenes and their aromatic or antiaromatic character.

Experimental apparatus for determining atmospheric pressure in the laboratory.

The conductivity of millimolar electrolyte solutions can be studied in undergraduate laboratory experiments by dropping electrolyte solutions in deionized water.

Methylene Blue and Erythrosine B showed photodynamic action in the inhibition of microbial growth after LED light exposure in a simple and didactic experiment. It can be applied in Chemistry courses allying advanced researches with basic concepts.

Four alternative biomasses were applied in undergraduate organic chemistry experiment for oil extraction and biodiesel production. Infrared and hydrogen nuclear magnetic resonance spectra of oils, oil and biodiesel and biodiesels were compared.

Qualitative energy-level molecular diagrams for different geometry allow to explain the preferred geometry of simple molecules on basis of the number of nonbonding electrons.

Pericyclic reactions can be classified according to the connectivity of reactants systems as connected atom reactions (CAR) and as not connected atom reactions (NOCAR). HOMO's topology is adequate to explain all CAR, while the HOMO-LUMO's topology explain all NOCAR.

Schematic representation of possible reaction pathways in the corrosion of carbon steel by hydrogen sulfide.

This figure represents the interrelationship between different aspects that can be analyzed on the teacher formation from this experience.

The findings show that the majority of undergraduate students in chemistry at the São Paulo State University take the course for reasons that are essentially motivated by intrinsic factors.

Analytical calibration curves for sodium ions in flame atomic emission spectrometry: effect of solvent composition.

This work proposes a discussion on the construction of texts that deal with the biological properties of ruthenium complexes and their application as metallodrugs, aiming to criticize the misuse of some generalizations about the chemistry of this element.

1,2,4-Oxadiazoles are heterocyclic with a broad spectrum of applications. Given this, the present search aimed at analyzing the potential and evolution of the technology involved in oxadizoles application through research papers and publications of patent applications.

In the 21st century, medicinal chemists will face many challenges to improve the quality of life of populations. The challenges consist of emerging infectious and non-communicable diseases. To combat them, innovative technologies shall be developed.