JBCS

Spatial distribution of toxins and other metabolites of fresh water cyanobacteria by matrix-assisted laser desorption ionization imaging mass spectrometry (MALDI-IMS).

A sensor based on titanium dioxide nanoparticles modified carbon paste electrode (TiO₂NPs/CPE) was developed for electrocatalytic oxidation of pramipexole in pharmaceutical formulations and biological samples in the phosphate solution at pH 5.0.

Green and efficient ultrasound assisted extraction of iodine from food products was obtained. Deionized water was used as an extraction solvent under ultrasonic-assisted extraction (UAE) within 5 min. High recovery of all samples verified good extraction performance.

Instead of the typical crystallization of CaCO₃ into large calcite crystals, very small uniform spherical particles were formed upon addition of polymers.

S^2- was oxidized to SO₄^2- at a boron-doped diamond (BDD) anode. The oxidation occurs with the formation of other intermediate sulfur species, mainly at low applied current intensity.

In this work, computational calculation methods were applied to study the interconversion between tautomers of several naphthazarin and 5-amino-8-hydroxy-1,4-naphthoquinone β-substituted derivatives bearing electron-donor or electron-withdrawing groups.

A methodology for biogenic amines derivatization was optimized by experimental design. The optimal conditions were: 15 μL of derivatizing reagent, 20 °C of temperature and 40 min of reaction.

Synergy effect in the photocatalytic degradation of organic substrates by TiO₂/activated carbon nanocomposites.

A facile and new metal-free 1,3-dipolar cycloaddition reaction for the synthesis of 4-aryl-NH-1,2,3-triazoles from nitroolefins and NaN₃ employing NH₂SO₃H has been developed. The key intermediates associated with this transformation have been characterized by on line monitoring of the reaction by using ESI-MS/MS.

Two new dimeric naphthoquinone derivatives, warmingiins A and B, were isolated from the tubers of Sinningia warmingii.

Aliphatic and polycyclic aromatic hydrocarbons were assessed in surface sediment samples of Itajaí-Açu estuarine system, in order to determine the depositional organic matter source.

Quality control methods to detect poor-quality medicines and counterfeit antimalarials are essential. This study presents a rapid and reliable LC-MS/MS method, successfully applied for evaluating the quality of the antimalarials artesunate and mefloquine.

SDS-PAGE of standard proteins (left column), exo-PG (middle column) and purified PG (right column) from DEAE-Sepharose FF chromatography. After purification, SDS-PAGE analysis of the purified exo-polygalacturonase from Aspergillus niger SW06 showed a single band with a molecular mass of 66.2 kDa.

Twenty-two glycoside compounds have been separated from tobacco after ultrasonic assistant extraction and purified by Amberlite AB-8 column. The structures of the tobacco glycosides were reliably identified by high performance liquid chromatography electrospray ionization linear ion-trap tandem mass spectrometry (HPLC-ESI-LIT/MSⁿ) coupled with electrospray ionization orbitrap mass spectrometry (ESI-Orbitrap-MS).

Surface fractal dimensions of rice hull ash samples prepared by solid-combustion with corresponding Co²⁺ adsorption.

Starch-based material comprising chitosan-modified clay showed a decrease of decomposition rate in composting test in comparison to pristine thermoplastic starch.

This figure shows the concentration profiles of emitted pollutants in biofuels and blends from a stationary engine.

The graft copolymerization of styrene onto deproteinized natural rubber has been studied. The core-shell arrangement was obtained in styrene-deproteinized natural rubber copolymer. This structure resulted in the outstanding thermal and mechanical properties of graft copolymer.

How light, water and oxygen can affect biodiesel during storage?

Click-chemistry protocol aims to access molecular diversity based on two strategies to obtain scaffolds of 2-amino-alkyl substituted natural and synthetic 1,4-naphthoquinones linked to the 1,2,3-triazole heterocyclic ring.

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

The use of a negatoscope to illuminate the samples was a simple, low cost and effective output to suppress the interferences from external light.