JBCS

NIR monitoring of transesterification reactions and application of MCR-ALS with correlation constraint to estimate methyl ester concentration profiles.

This is the first phytochemical sudy of Psychotria nemorosa Gardner leaves (Rubiaceae) established in a metabolomic perspective by GC-MS and LC-MS, besides its antinociceptive activity.

This paper is part of the PubliSBQ Special Issue in honor of the late Prof Angelo da Cunha Pinto.

Micellar precipitation process was investigated. This method provides high efficacy for extraction of benzimidazoles analysis.

Novel dextran-coated SPIONs functionalized with platinum complexes afford high colloidal stability in aqueous and PBS buffer media.

The synthesis of biodiesel requires analysis with high resolution and detectability for determining the biodiesel raw material.

Cashew nutshell liquid (CNSL) can be used as antioxidant in biodiesel increasing its oxidative stability, even when added in 0.1% m/m or in lower concentration.

We obtained novel binuclear chromium(III)-ligand bridging complex. The docking study of the Schiff base ligand illustrates the binding interactions with PAF protein.

New unsymmetric thioether Schiff base amine, unsymmetric Schiff base ligand (L) and related complexes of this ligand were prepared and characterized by the appropriate spectroscopic methods.

Lettuce is an important crop consumed in Brazil and dithiocarbamates are the most frequently fungicides detected in Brazilian monitoring programs. Due to this, it is necessary analytical methods with high quality in order to determine dithiocarbamates residues in lettuce.

Rotating frame nuclear Overhauser effect spectroscopy (ROESY) correlations were used in the elucidation of the overall stereochemistry of the three alkaloids obtained from S. pseudoquina A. St.-Hil.

This study demonstrated that the nitration of coal tailings to increase humic acids yield is a promising alternative for a sustainable fate of these residues.

A coagulation-flocculation process was evaluated as alternative for treatment of biodiesel wastewater, being obtained efficiencies between 82 and 99% for removal of apparent color, oils and fats, turbidity and suspended solids.

Chemically activated pencil graphite electrode modified with CuO nanocubes presented as electrochemical H₂O₂ sensor. The presented sensor has excellent electrocatalytic activity toward H₂O₂ oxidation (dramatically decrease in H₂O₂ oxidation overpotential, at about +0.05 V vs. Ag/AgCl).

Typical Amaryllidaceae alkaloids have been identified from Hippeastrum aulicum by means of capillary gas chromatography-mass spectrometry (CGC-MS). Leaf and paper spray mass spectrometry were carried out and the results obtained were in agreement with CGC-MS data. NMR data for the new compound haemanthamine N-oxide are also reported.

In this work a fast and efficient method was optimized by central composite design, validated and applied for natamycin residues determination in wine samples by UHPLC-MS/MS.

Spectroanalytical analysis of tea samples using ICP OES (infusion and mineralization) and direct Ca, K and Mg determination using LIBS

The acidic fraction of tar sand bitumens from Pirambóia Formation, Paraná Basin, were analyzed by negative-ion ESI LTQ Orbitrap XL. The distribution of heteroatom classes determined by the obtained mass spectra was used to assess biodegradation.

Levels of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) and polychlorinated biphenyls (PCBs) were investigated in soils from Belo Horizonte-MG.

Liquid-liquid microextraction methods (DLLME and USAEME) combined with LC-UV for determination of bosentan in biological samples.

The concern about the presence of veterinary drugs residues in food of animal origin 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 QuEChERS method was successfully modified and validated for avermectins residues determination in ovine muscle samples by HPLC-FD and UHPLC-MS/MS.

To the sample solution, appropriate amounts of DDTC (complexing agent) and NaPF6 were added. After standing for 2 min, 0.5 mL methanol containing 0.13 IL was injected rapidly. After centrifuging, extraction phase was mixed with 500 µL methanol prior to the flame-AAS analysis.

Peptidomimetics were considered as inhibitor candidates for NS2B-NS3pro DENV-2. Molecular docking and QM/MM calculations were used to evaluate these various compounds. Ligand Bz-Nle-m(Am)Phe-m(Im)Phe-(dMo)Phe-H was found to be the best inhibitor candidate for this molecular template. These findings may motivate additional virtual screening based on the pharmacophoric hypothesis to characterize lead compounds for therapies targeted against DENV.

GC-MS and NMR analyzes of the essential oil from leaves of 62 individual specimens of Myracrodruon urundeuva ("aroeira-do-sertao") permitted to identify six different chemotypes characterized by the major constituents: myrcene, α-pinene, limonene, Δ³-carene, and (Z) and (E)-β-ocimene.

Compounds obtained from the plant Conyza canadensis through pressurized hot water extraction presented antifungal activity.

Active principle of olanzapine in different pharmaceutical excipients using near infrared spectroscopy (NIRS) and multivariate calibration was developed.