JBCS

For the extraction of analytes, salt solution is added to the aqueous sample to form micelles. After centrifugation, enriched micellar phase is dissolved in a diluting solvent and was transferred to a microcell for spectrophotometric determination.

A comparison between dichromate oxidation and dry combustion analysis as reference methods in multivariate calibration from near infrared spectroscopy was evaluated.

The concern about the presence of pesticide residues in fruits has prompted the search for alternative methods able to detect low levels of these compounds in a simple and efficient way. Thus, in this work a quick, easy, cheap, effective, robust and safe (QuEChERS) method was successfully modified, validated and applied for pesticide residues determination in grape samples by gas chromatography coupled with mass spectrometry.

We describe the synthesis of 4-methylcoumarins/1,4-substituted 1,2,3-triazole conjugates that are moderate inhibitors of acetylcholinesterase in vitro.

Gaseous polycyclic aromatic hydrocarbons (PAHs) in a parking lot impacted by gasoline and ethanol blend used in flex-fuel vehicles.

This work reports the interaction evaluation of twelve β-carboline derivatives with deoxyribonucleic acid (DNA) using spectroscopic techniques, correlation of binding constants (K_b) with IC₅₀ of seven human cancer cell lines and molecular docking.

A careful optimization of the microwave-induced combustion method for Brazilian coal digestion for further determination of sulfur by inductively coupled plasma optical emission spectrometry (ICP OES) and ion chromatography was developed.

A new electrochemical sensor based on glassy carbon electrode which is modified by nafion, graphene oxide, silver nanoparticles and tert-butylhydroquinone (TBHQ) for hydrogen peroxide determination in real beverage samples was developed.

27 potentially active thiazolo[3,2-a]pyrimidine derivatives were analyzed by two methods: reversed phase high performance liquid chromatography (RP-HPLC) and reversed phase thin layer chromatography (RP-TLC) methods. Determined lipophilicity parameters are in the range from 0 to 5. It is mean that there are hydrophobic substances, soluble in the lipid phase and in case of being used as drugs, they will be active after oral application.

The feasibility of applying differential pulse anodic stripping voltammetry technique for the determination of metals species in the petrochemical industry effluent was demonstrated after UV-assisted digestion procedure.

Influence of conformational dynamics of glutathione S-transferases (GSTs) on dichloro-diphenyl-trichloroethane (DDT) metabolizing was investigated through molecular dynamics simulations.

Novel 3-arylaminocyclohexyl N,N-dimethyl carbamates synthesized showed selectivity for the butyrylcholinesterase (BuChE) inhibition. Kinetics studies indicated a mixed-type inhibition against BuChE which is compatible with molecular modeling studies.

Development of a liquid chromatography-tandem mass spectrometry (LC-MS/MS) method for the determination of 25 pesticides, which are widely used in grape culture in Brazil, in grape juice. The method was validated according with INMETRO (Instituto Nacional de Metrologia Qualidade e Tecnologia).

This molecule is a promising drug lead for the development of derivatives and treatment of metabolic syndrome with the benefits of a peroxisome proliferator-activated receptor pan activation.

Taxifolin is the major individual polyphenol in the aqueous extract of the bark of Pinus pinaster and may be a chemical marker for quality control of this extract. It was analyzed by reversed phase liquid chromatography with photodiode array detector.

A novel and sensitive method based on dispersive liquid-liquid microextraction coupled with positive corona discharge ion mobility spectrometry has been evaluated as a fast and inexpensive technique for the direct determination of melamine in milk, dairy products and egg yolk.

In this work carbon paste electrodes modified with Eichhornia crassipes roots were employed to study the adsorption of thallium (Tl⁺) and cadmium (Cd²⁺) ions. Ions interact with different functional groups that are present in the roots. Eichhornia crassipes is an effective alternative for the removal of Tl⁺ and Cd²⁺ ions from an aqueous medium.

Two different gold nanoparticles (AuNPs and polylactic acid-AuNPs) were prepared for construction of biosensors on screen-printed electrode. The performance of fabricated biosensor based on polylactic-stabilized AuNPs shows better sensitivity and stability.

The degradation of Typha angustifolia L. is accompanied by the remaining mass and ash percentage showing the liberation of polyphenols and phosphorous compounds from lignocellulosic tissue, which consequently generates humic substances. Different phosphorous compounds were identified in the remaining mass by ³¹P NMR (nuclear magnetic resonance).

Umbu can be even more useful in the semiarid areas, where it is a native plant and where there is a lack of good quality drinking water. Coal prepared with its seed contains no toxic substances and can used for domestic desalination of brackish water.