JBCS

The lipase-catalyzed synthesis of thiamphenicol derivatives has been studied through complementary acylation and hydrolytic approaches, finding Candida antarctica lipase B as the most efficient biocatalyst for the selective modification of both thiamphenicol and thiamphenicol diacetate, respectively.

A phytochemical study of roots of Dahlstedtia glaziovii (Fabaceae) furnished a new dibenzoylmethane glaziovione, along with eighteen known compounds. The antiproliferative activity of the isolated dibenzoylmethanes and flavones were investigated, being the dibenzoylmethanes more active than flavones.

Novel synthesis of bis-chalcones and bis-pyrazolines using cellulose sulfuric acid as highly efficient and biodegradable heterogeneous catalyst under solvent-free conditions.

Methylpyrimidine sulfonyl piperazine 3d optimized structures. Substituted sulfonyl piperazines with pyrimidine, piperazine and sulfonamide functionality, a combination of three pharmacologically important moieties, was synthesized and their antibacterial, anthelmintic and anti-inflammatory activities were evaluated.

Calculations show that insertion of carbenes into the framework structure of zeolite Y is thermodynamically favored, affecting the acid strength and creating chiral sites in the structure.

Dyes obtained from grapes were used as sensitizers in dye-sensitized solar cells with efficiencies up to 0.08%. Moreover, the direct use of Port wine drops curiously resulted in an efficiency of 0.025%.

Phytate is a natural product that was found to be antioxidant in models of iron-overload disorders.

A membrane with ionizable groups is modeled as a plan with a negative charge density. Results for dissociation degree and pH variation with the ionic strength are presented for the Poisson-Boltzmann equation (PB) and its linear form (LPB).

Four mononuclear and one dinuclear iron(III) compounds were synthesized employing four different ligands, which are distinct with respect to the diazocycle backbone. Electrochemical data showed that the compounds show ligand-centered redox processes. The formation of phenoxyl radical was confirmed by EPR and UV-Vis spectroscopies for complexes [FeL2Cl], [Fe₂(L4)(HL4)Cl] and [FeL4].

Fluid catalytic cracking (FCC) spent catalyst as a source of rare earth elements (REE) - an interesting application in agreement with the recycling-recovery concept.

Response in different dopamine concentrations and analytical curve.

In situ surfactant-based solid-phase extraction (ISS-SPE) is proposed as a preconcentration procedure for the determination of cadmium in water and food samples by flame atomic absorption spectrometry. From left to right: sample solution; injection of NaPF6 solution; end of injection and enlarged view of sedimented phase after centrifugation.

A sensitive method based on the preconcentration of uranium on modified filter paper (thin-film solid phase extraction) has been developed to determinate this element in water and soil samples by X-ray fluorescence.

ZnO photoelectrodes produced by combustion synthesis process promote the discoloration of methylene blue dye when irradiated with UV light.

Characterization process for certifying K₂Cr₂O₇ as certified reference material (CRM) by precise constant-current coulometry: from a candidate CRM until a certified value.

A Box-Behnken design and correlation studies were applied in order to obtain more information about how specific antioxidants affect the total antioxidant activity and the degree of forced oxidation in white breads with chia seeds and carrot leaves.

Coupling of anionic exchange chromatography (AEC) with matrix-assisted laser desorption-ionization-time of flight (MALDI-TOF) in order to determine the molecular mass of V-binding protein(s) in phytoplankton (> 64 µm) from Cabo Frio.

3D hydrogel matrices based on GAm (chemically modified Arabic Gum) and DAAm (dimethyl acrylamide) were prepared on GAm:DMAAm rate 60:40 w:w. Essays of solutes (VitB₁₂ and DFK) release from 3D matrices were performed. The partition-diffusion model allows predicting whole profile of release in any case. It was verified that α/k_R ratio is not volume dependent, at a certain temperature, but the temperature strongly influences such ratio for both solutes.

S180 cells, a model of tumor murine for testing drug candidates with potential anticancer activity, were studied by HR-MAS NMR for establishing optimal pulse sequence and metabolite assignment.

In this work, ³¹P NMR-based metabonomic of human blood serum allowed to discriminate ischemic stroke patients from health individuals and gives insights over the mechanism triggered by ischemic stroke.