JBCS

Photoelectrocatalytic reduction of nitrite reached 100% and its conversion involves formation of ammonium ion and nitrogen containing gaseous species by using a two compartment reactor and absence of dissolved oxygen. The procedure is based on UV irradiation of Ti/TiO₂ semiconductor biased with more negative potential than their flat band potential.

Glycerol and glycerides were determined in samples of biodiesel ethyl esters from soybean/tallow mixture and sunflower and biodiesel methyl esters from soybean/tung mixture and tung oil by employing ASTM D6584 method.

A schematic representation of the matrix solid-phase dispersion (MSPD) of furanocoumarins.

The ambient ionization mass spectrometry techniques DESI and EASI were employed to directly analyze intact beans of Arabica coffees processed by the dry, semi-dry and wet post-harvest treatments.

Compound in the right showed best antibacterial and antifungal activity with MIC of 16 µg mL^-1 against bacteria Staphylococcus aureus, Bacillus subtilis and also against fungus Aspergillus niger.

A simple and fast derivatization method for analysis of glyphosate and aminomethylphosphonic acid (AMPA) using UV spectrophotometry.

A variety of (1,4-phenylene)bis(arylmethanesulfonylpyrroles and pyrazoles) were prepared by the cycloaddition of 1,3-dipolar reagents, tosylmethyl isocyanide and diazomethane to the Michael acceptor 1,4-bis(E)-2-((arylmethanesulfonyl)vinyl)benzene and evaluated for antioxidant activity. Amongst the tested compounds 5d displayed excellent radical scavenging activity in all the three methods evaluated when compared with the standard ascorbic acid.

Formic Acid (FA) oscillating mechanism is stressed in the network diagram; competition of CO_ads and OH_ads by the same free site (*) forms, each one, a loop over the free sites, while direct FA electro-oxidation forms a loop with high turnover rate. Subsurface hydrogen accelerates the direct FA electroxidation and slows down CO adsorption on Palladium.

A reactive polyamide 6 (PA6)/SiO₂ masterbatch containing 20% (mass fraction) of nano-SiO₂ was used as a filler to prepare polyamide 6/SiO₂ nanocomposites. The as-prepared nanocomposites with 0.5% nano-SiO₂ content presented the best mechanical properties.

Degradation products of methanolic and aqueous solutions of phenylethylamine (left) and tyramine (right) by gamma radiation at 5kGy.

In the present study, the antioxidant capacity, using different methodologies, and the fatty acid composition of tilapia fillets supplemented with extract of acerola fruit residue were evaluated.

A new spectrophotometric method was developed to determine the enzymatic activity of endo-β-mannanase. A key advantage of the method is that it can be performed with only 5 mg of germinating seeds and hence different parts of the seed can be quickly and efficiently assessed.

An efficient process for synthesis of pyranoquinolines via Knoevenagel condensation then the ring closures through an addition-elimination reaction of readily available 2-chloroquinoline-3-carbaldehydes with dimedone was reported. On the other hand, NICS values were used as quantitative measures for the relative aromatic character in pyranoquinolines. The results show that NICS for phenyl group of pyranoquinolines are less than that for benzene.

Reaction of in situ generated benzeneselenol with various (E)-chalcones using glycerol as solvent, gave β-selanylcarbonyl compound or chemoselective 1,4-reduction products, depending on the amount of benzeneselenol employed and the nature of (E)-chalcone. The glycerol/H₃PO₂ system can be easily recovered and reused in chemoselective 1,4-reductions and the natural product zingerone can be synthesized in good yield.

Potentiodynamic polarization curves of the ISO NBR 5832-1 stainless steel with cold deformation (50% reduction in thickness) or without deformation (0%) showing that the cold deformation increased pitting susceptibility of the stainless steel.

Structure of smectic C (SmC) mesophase determined by X-ray analysis of polymer tetrazoles poly-{4-(2-nonyl-2H-tetrazol-5-yl)phenyl 4-[(propionyloxy)butyloxy)]}benzoate (left) and poly-{4-(2-nonyl-2H-tetrazol-5-yl)phenyl 4-[(propionyloxy)undecyloxy)]}benzoate (right).

Modification of glassy carbon electrode with MWCNT-COOH and copper phthalocyanine complex, which is responsible for imitating the active site of the P450 enzyme, iron protoporphyrin IX.

The technique of solid-liquid extraction with purification at low temperature was used in the monitoring of sewage sludge samples collected within the period of 11 months. The 1,2,3-trichlorobenzene was quantified in concentrations higher than the maximum residue limit for chlorobenzene in soil amended with sludge.

An analytical method was optimized and applied to analyze the antifouling biocides irgarol and diuron in estuarine and coastal waters under the influence of Rio Grande harbors. The concentrations were lower (< 1.3 to 21 ng L^-1) than those capable of causing harm to the aquatic biota.

A green procedure to the domino one-pot three-component reaction was developed to the synthesis of 4-aryl-tetrahydroquinoline-2,5-diones.