JBCS

We review semiconductor photocatalysts for the H₂ evolution reaction that have displayed the best reported activities and quantum efficiencies.

This review discusses colloidal aspects of crude oil asphaltenes and their impact on oil production issues.

The goal is to demonstrate the scope of the practical acetal acetylation methodology for synthesis of trihalomethyl substituted 1,3-dielectrophiles and their versatility in the preparation of 1,2-azoles.

Ultra-performance liquid chromatography coupled to mass spectrometry (UPLC-ESI-MS) method for quantitation of Amaryllidaceae alkaloids.

Brazilian Cerrado biomass waste was evaluated as potential raw-material for biofuel and bioproduct production in biorefineries.

A series of fenofibric acid ester pro-drugs were synthesized. The oral administration (20 mg kg^-1) of JF-2 showed a relative bioavailability of approximately 272.8% compared to fenofibrate.

A novel method for the synthesis of nonsymmetrical 3,3'-(aryl/alkyl-methylene)bis-2-hydroxy-1,4-naphthoquinones was developed by using the Mannich adduct of naphthoquinone and the reaction with another moiety of 2-hydroxy-1,4-naphthoquinone.

The image represents the parameters in which high performance liquid chromatography using inductively coupled plasma with triple quadrupole mass spectrometer (HPLC-ICP-MS/MS) was superior to high performance liquid chromatography with diode array detector (HPLC-DAD) in determining glyphosate and aminomethylphosphonic acid (AMPA).

Cysteine (Cys) can release Cu^II ion from the non-fluorescent a-Cu^II complex. Then hydrolytic cleavage of Schiff base (E)-2-(6-(diethylamino)-2-((2-hydroxyphenylimino)methyl)-3-oxo-3H-xanthen-9-yl)benzoic acid (a) produces a pink fluorescent compound 2-(6-(diethylamino)-2-formyl-3-oxo-3H-xanthen-9-yl)benzoic acid (2). Thus, Cys residues act as a “switch” in an off-on fluorescence system.

The transesterification reaction of soybean oil was modeled considering the 3 steps of the direct and reverse reactions following a second order general kinetics by the finite element method.

Three hydrogels were prepared and applied in pancreatin encapsulation. Alginate hydrogel presented better encapsulation efficiency and enzyme release representing as an alternative to replace the commercial formulation.

Analytical procedures, from the collection of samples to the correlation of chemical identification with biological activity.

The constituents that can generate the pitch are in smaller quantities in the extracts of Acacia mearnsii wood in relation to the eucalyptus wood.

The integrative approach based on simplex-centroid design, electrospray ionization mass spectrometry (ESI-MS), and multivariate analysis provided an effective way to assess the phenolic composition of Endopleura uchi bark.

A series of pumilacidins were isolated from the solid culture of the marine-derived bacterium Bacillus sp. 4040. The structures were determined using a combination of mass spectrometry, nuclear magnetic resonance (NMR) spectroscopy and comparison with reported data.

A novel aromatic polyketide isolated from Microsphaeropsis arundinis.

Cysteine (Cys) does not present voltammetric response at bare graphite-polyurethane composite electrode (GPUE) or even at non-treated GPUE containing electrodeposited copper nanoparticles (CuNP). When GPUE-CuNP is electrochemically pretreated in basic medium the Cys response can be observed based on its interaction with Cu oxides at electrode surface allowing analytical applications in an amperometric wall-jet procedure.

LiMn₂O₄ was synthesized by the solution combustion method using corn starch as fuel with temperature below 700 °C. This synthesis is ecofriendly and has a lower cost than the standard methods. The influence of the Li⁺ cations amount on the MnO₂ oxide structural and electronic properties was also evaluated by the density functional theory (DFT) method.

Multidimensional gas chromatography method for ethanol monitoring in medicated syrups in order to question quality certificates from regulatory agencies.

Five phenolic acids were evaluated according to the fragmentation profile by collision-induced dissociation (CID) using triple quadrupole mass spectrometry by electrospray ionization in negative ionic mode (ESI(−)-MS/MS), combined with thermochemical data obtained by computational chemistry and hydrogen by deuterium (H/D) exchange.

Hybrid coating application to Ti-6Al-4V alloy prepared through the sol-gel method.

Wine samples were added in the hydrophilic microzones of a paper device followed by addition of NaOH solution in stoichiometric excess. An infrared camera was used to record the analytical operations. The neutralization reaction releases heat, and the temperature of solutions rises, and it could be directly related to the wine acidity.