JBCS

CeO₂ based catalysts are used for the determination of the activation parameters on the soot combustion reaction.

The synthesis process of biodiesel using acid oil (jupati oil), ethanol, and acid catalyst has been optimised employing experimental design and response surface methodology.

The present work shows the coordination chemistry of Co^II, Cu^II and Ni^II complexes and the synthesized macrocyclic ligand. The mononuclear complexes were characterized by various spectroscopic techniques. In the search of new antimicrobial agents, these complexes were screened in vitro for their antimicrobial activities and the effect of the central metal attached in these complexes and the macrocyclic ligand were compared.

A new derivative spectrophotometric method was developed, validated, and compared to HPLC for the determination of PTX in a liposomal formulation.

Enzymatic kinetic resolution (EKR) of (±)-cyanohydrins was performed by using immobilized lipase from Candida antarctica (CALB) under conventional ordinary conditions (orbital shaking) and under microwave radiation (MW). Under the latter experimental conditions, good performance and shorter reactions times were achieved.

A simple and rapid methodology for determining the content of adulterants in diesel and biodiesel-diesel blends by integration of fluorescence spectra.

Using the knowledge obtained from the orthologous enzyme, a series of thiazolyl-1H-benzo[d]imidazole derivatives was synthesized and assayed as inhibitors of Mycobacterium tuberculosis inosine 5'-monophosphate dehydrogenase (MtIMPDH).

MCM-41 was used for poorly water soluble meloxicam (MLX) as model drug. The in vitro release of MLX was performed at pH 1.2 and 6.8.

Chemometric approach to the study of antiproliferative activity of newly synthesized hydantoins.

Ultraviolet-partial least squares (UV-PLS) and diffuse reflectance infrared Fourier transform spectroscopy-PLS (DRIFT-PLS) methods for the simultaneous quantification of two veterinary pharmaceutical drugs pyrantel pamoate (PP) and praziquantel (PZ) in commercial tablets and capsules.

The efficient synthesis of novel rhodanine-based amide derivatives via Passerini reaction using tetramethylguanidine-functionalized silica nanoparticles as a reusable heterogeneous base catalyst, and the antibacterial activity of the synthesized compounds are described.

Metallocene was heterogenized on spherical ZSM-5 zeolite and employed in ethylene polymerization reactions.

Two-dimensional gas chromatography showed superior potential compared to one-dimensional gas chromatography for the characterization of Brazilian Moscatel sparkling wines, which showed a homogeneous volatile signature.

Two methods for determining the iodine value in vegetable oils are described. One employs mid-infrared spectroscopy and the other uses hydrogen nuclear magnetic resonance.

The profile and the concentration of the polycyclic aromatic hydrocarbons (PAHs) were determined in samples of superficial sediments of the Rio Negro in the Amazon region of Brazil.

Several ursane triterpene derivatives were isolated from the stems of Firmiana simplex. Their cytotoxic activity was evaluated against lung adenocarcinoma (A549), ovarian cancer (SK-OV-3), skin melanoma (SK-MEL-2), and colon cancer (HCT-15) cell lines using the sulforhodamine (SRB) bioassay.

A method for obtaining triazole units from alkynyl amino esters via click chemistry using a variety organic azides.

Stepwise design and discussed bio-evaluations of poly(vinyl alcohol)-hyaluronic acid (PVA-HA) hydrogel membranes for wound dressing applications.

In this study, simple and efficient ultrasound-assisted emulsification microextraction based on applying low density organic solvents combined was developed for the preconcentration and determination of mononitrotoluenes in water samples.

In situ pulse anodic stripping voltamettry and polytetrafluorethylene membrane-based liquid three-phase micro extraction is presented for the micro extraction and quantification of cadmium(II) ions in trace levels. The obtained calibration curve was in the range of 1.0-250 nmol L^-1 Cd^II with a limit of detection of 0.1 nmol L^-1.

Two different methods using diffractograms were used to calculate the crystalline content using near-infrared spectroscopy (NIRS) and chemometrics.

Synthesis of dithiocarbamates by Markovnikov addition reaction in polyethylene glycol (PEG) and their application in amidoalkylation of naphthols and indoles is reported in this manuscript.

Dairy effluent treatment through the catalytic ozonation using Fe²⁺ in a semi-batch process with recycle, proposed new reactor.

Different surfactants have a significant effect on the morphology of catalysts and their active phase. Addition of polyvinyl alcohol (PVA) in catalyst preparation is favorable for the formation of a loosely packed microstructure and more iron carbide. Therefore, the catalyst prepared with PVA exhibits high performance of Fischer-Tropsch synthesis.

The new biflavanone (2R*,3R*,2''R*,3''R*)-7-hydroxy-4'-methoxy-flavanone-(3→3'')-3''',7''-dihydroxy-4'''-methoxy-flavanone was isolated from the stems of Schinopsis brasiliensis (Anacardiaceae), and showed weak inhibition of acetyl and butyrylcholinesterase enzymes.