JBCS

In this work, the synthesis of the C(7)-C(20) fragment of spirotoamides A, B and C has been accomplished by a sequence involving 14 steps (0.36% overall yield, average of 81% for each step) in high diastereo- and enantioselectivity, employing, as determining steps, asymmetric Mukaiyama and boron-mediated 1,5-anti promoted aldol reactions between α-methyl-β-hydroxyketones and aldehydes.

The study of the lipid stability of lyophilized human milk is very important for human milk banks. This study presents the values of acidity, fat content, composition of fatty acids and triacylglycerols profile of lyophilized human milk at times 0, 30, 60, 90, 120, 150 and 180 days of storage.

Droplet size distribution measurements by low field nuclear magnetic resonance (NMR) in water/oil (W/O) crude oil emulsions prepared under different shear conditions.

The 3-aminopropyltriethoxysilane (APTES) addition after 90 min of synthesis resulted in a nanoparticle with higher resistance to the extraction process and with more NH₂ groups located on the outer surface.

Spent coffee grounds (SGC) from the industrial production of soluble coffee were extracted in Soxhlet generating an oil rich in linoleic and oleic acid. The solid residue of this extraction was subjected to pyrolysis producing bio oil. The bio-oil was analyzed by gas chromatography coupled to the mass spectrometry (GC-MS) allowing the identification of several compounds important for the chemical industry and for the production of biofuels (phenols, acids, caffeine, indole, hydrocarbons).

Twenty-four chemical constituents of the decoction from leaves (showing anti-inflammatory activity) of a cultivated specimen of Myracrodruon urundeuva have been isolated and characterized by modern hyphenated chromatography methods (high-speed counter-current chromatography (HSCCC), ultra high-performance liquid chromatography-photodiode array (UHPLC-PDA), and HPLC-PDA-evaporative light scattering detector (ELSD)) and spectroscopy (high-resolution mass spectrometry (HRMS), and 1D and 2D nuclear magnetic resonance (NMR)).

Fifteen alkaloids were identified from roots of Worsleya procera. The alkaloids and extracts were tested in vitro against Plasmodium falciparum.

Synthesis of PtSn-based electrocatalysts with CeO₂ nanorods used in the ethanol electrochemical oxidation for power generation.

The photo- and electroluminescence properties of novel 2-acyl-1,3-indandionate complexes were investigated. The electroluminescent devices with configurations glass/ITO/β-NPB/[Al(acind)₃]/LiF/Al and glass/ITO/β-NPB/spiro-2CBP/[Al(acind)₃]/Al exhibited red and green emission colors, respectively, under applied voltage.

Liquid chromatography-tandem mass spectrometry (LC-MS/MS) multi-target screening and quantitation indicated alarming pesticide contamination in all waters sources analyzed from a rural area.

Presented here is the synthesis, characterization and catalytic properties of an organic-inorganic hybrid material, Pd@PAAs-CD. This hybrid material was used to catalyze Suzuki-Miyaura cross-coupling reactions between substituted aryl halides and phenyl boronic acid in high yields. The high reaction efficiency makes this new catalyst system a useful alternative to other recently-developed methods for the preparation of substituted arenes. In addition, it is also demonstrated that Pd@PAAs-CD can be recycled and reused in further cross-coupling reactions.

A novel method for sintering Pt metal particles by nitrile reduction was used, observing a controlled migration of the metal particles to the surface layers. The optimal particle size that maximized the enantiomeric excess (ee_R) was obtained at 24 h sintering.

The occurrence of uniform corrosion (UC), intergranular corrosion (IGC) and pitting corrosion (PC) was observed on the surface of Q235 carbon steels in 0.01 mol L^-1 NaNO₂-HCl solutions with pH 1 and 2, pH 3 and 4, and pH 5 and 6, respectively.

This study screening bis-naphthoquinones series against Zika virus. The findings showed that among the compounds analyzed four were promising.

The counterion-tetrakis Gd^III and Eu^III complexes interaction evaluated by spectroscopic data/theoretical methods will provide guidance for development of displays.

Identifying alternative and more favorable non-ionic pathway for uncatalyzed Prins cyclization by means of density functional theory (DFT) calculations.

Piptocarphins A, B, D and a new sesquiterpene lactone, 8α-tigloyloxy-10α-hydroxy-hirsutinolide, along with triterpenes, flavonoids and chlorogenic acid derivative were isolated from Vernonanthura nudiflora. The isolated sesquiterpene lactones showed in vitro antiproliferative activity against human cancer cell lines.

Chitosan imparts better biological responses for poly(ε-caprolactone) electrospun membrane than dexamethasone.

Molecular oxygen dissolved in aqueous and biodiesel phases oxidizes the unsaturated fatty methyl esters that, with the aid of passivating agents, protect copper against corrosion. Free acids dissolve the passivating agents, increasing the corrosion rate.

A highly sensitive electrochemical impedance biosensor for the determination of lipopolysaccharide was designed using peptide as the recognition molecule.

Small doses of brown birnessite or pyrolusite were sufficient to remove about 90-99% of the dye.

An environmentally benign method was developed for the α-hydroxylation of malonates and γ-lactones and the synthesis of harzialactone A was achieved.