JBCS

Graphical abstract shows the part of the tire which is used for recycling (treads), the scanning electron microscopy of the obtained carbons and, in first plane, the efficiency of these carbons in removing dye as function of time

An improved procedure for the synthesis of indole-2-carboxylic acid esters in excellent yields has been achieved using ionic liquid under controlled microwave irradiation (100 W) at 50 °C

The dispersion of carbon nanotubes in water with different surfactants, as well as its incorporation into phenolic resin, was investigated. Ultrasonication of liquid suspensions was used to prepare stable dispersions and to evaluate the best surfactant to be used. Light scattering and UV-Visible spectroscopy was performed. The image shows a SEM micrograph for fractured surface of 0.5 wt.% CNT/phenolic composite containing 0.5 wt% of PSS surfactant

Extracted amount for the pesticides obtained with two different thicknesses of the polydimethylsiloxane fiber

Validated, simple, fast and sensitive square-wave cathodic adsorptive stripping voltammetric procedure was described for the determination of 3-hydroxyflavone, morin and hesperidin in biological fluids. The LOD and LOQ calculated for the investigated flavonoids confirmed the sensitivity of the proposed procedure

Solvent-free microwave-assisted amide synthesis via coupling of nascent phosphazenes with acyl chlorides or carboxylic anhydrides has been accomplished. It is an eco-friendly, rapid and simple approach eradicating the limitations associated with the prevailing time-consuming solution phase methodologies

The SEC curves obtained during styrene polymerization mediated by ATRP catalysts 1 and 2 shows that the control of MW is better with catalyst 1 than 2. This is a consequence of the phosphine ligand properties

Theoretical substituent electrophilicities σw were derived from the global electrophilicity of substituted benzoic acids, with applications to a variety of chemical processes. The good correlation between the theoretical σw and the empirical Hammett's σ  for uncharged substituents is discussed and explained

The phenylpropanoid substituted flavan-3-ol apocynin E was isolated along with eight known compounds from the stem bark of Trichilia catigua. All of them exhibited higher radical scavenging activity and reducing power than ascorbic acid and Trolox

The figure shows distribution of Cu in fractions obtained through sequential extraction. The sequential extractions allowed the portion of metals associated with the 13 non-residual (FR1: acid extractable, FR2: reducible, FR3: oxidizable) and residual 14 fractions (R) of the sediment to be determined

Oxadeazaflavines are prepared in 5 min by solid state microwave cyclization of ortho-halobenzylidene barbiturates with yields above 90%. Molecular modeling simulations indicate as mechanism an intramolecular hetero Diels-Alder cyclization followed by loss of HX leading to rearomatization

Micrograph of single grains of polycrystalline Cu-16%Zn-8%Al alloy obtained by petrographic microscopy

In octadienoic acid profiles to raw, pasteurized and sterilized milk samples occurs significant difference between raw and UHT milks for CLAc9t12 and 18:2c9c12 and no difference between raw and UHT milks for CLAt10c12. This fact evidences the successive action of heat treatments on milk lipid profile

Selected region of a chromatogram obtained by comprehensive two-dimensional gas chromatography of synthetic fuels produced by Fischer-Tropsch synthesis. High level of resolution for n-alkanes, branched alkenes, alkenes and n-alcohols analysis was promoted by this technique

Total volatile organic compound (TVOC) concentrations ranged from 101 to 12823 μg m^-3, with an average of 1594 μg m^-3 that exceeds the suggested limit (300 μg m^-3). Indoor/outdoor ratios for most of the parameters were higher than unit, indicating indoor sources of pollution. Overall, the environments did not present good air quality for the occupants due to chemical pollutants

Fluorescence spectroscopy was used to accompany the evolution of DOM during the mixing of fluvial and marine waters in the Piauí River estuary, which is a tropical estuary situated in the State of Sergipe, Northeast Brazil

Lipozyme TL IM was used to catalyse the esterification of isoamyl alcohol and butyric acid using hexane as solvent. The reaction was carried out in shaking incubator and the percent of isoamyl butyrate and its concentration was determined by titration

Automated CMDS-CE-C⁴D system for the near-real-time monitoring of low-molecular-weight carboxylic acids in air

Dual bifunctional catalysis plays an important role in the α-effect for the reaction of hydroxylamine with phenylacetate

The use of polypyrrole (PPy) as a potentiometric detector in high performance liquid chromatography (HPLC) for determination of sulfamethoxazole is reported in this work. The PPy electrode was successfully applied as a potentiometric detector for fast and accurate determination of sulfamethoxazole in standards and pharmaceutical samples

Is there anything else to be learned about the structure of liquids N-methylformamide and acetone? Yes, there is!

Use of DBU as an efficient catalyst for the chemoselective aminolysis of methyl esters leading to amides, as tested by the reactions employing esters and amines

The homogeneity, surface chemistry, structure and dispersibility in water of iron- and iron oxide-filled multi-walled carbon nanotubes are affected by different chemical treatments

A simple, green and efficient solventless procedure for the synthesis of eleven dihydropyrano[3,2-b]chromenediones from the threecomponent condensation reaction of kojic acid, aromatic aldehydes, and dimedone employing alum as reusable catalyst is described

A new second-order standard addition method is proposed to resolve the kinetic-spectrophotometric data of multicomponent mixtures and determination of analyte(s) in the presence of unknown matrix. The method uses variation matrices data by shifting to another target, namely the reaction space

A complete structural characterization is presented for the new alkaloid N-demethylcorreantoside, isolated from the leaves of Psychotria stachyoides

We report the synthesis of 24 Morita-Baylis-Hillman adducts using microwave irradiation at 80 °C or conventional protocol at 0 °C to promote the reactions in high yields (81-99%)

Multi-criterion analysis of the effects of subsampling ratio q on the subagging approach for multiple linear regression with variable selection by the successive projections algorithm

Phytochemical study on the leaves and twigs of Litsea glutinosa (Lour.) C. B. Rob. afforded the new megastigmane diglycoside (6S, 7E, 9R)-6, 9-dihydroxy-4, 7-megastigmadien-3-one-9-O-[α-L-arabinofuranosyl-(1→6)]-β-d-glucopyranoside (1), along with four known glycosides (2-4)