Enginyeria Química i Química Analítica: Enviaments recents
Ara mostrant els elements 61-80 de 790
A chemometric survey about the ability of voltammetry to discriminate pharmaceutical products from the evolution of signals as a function of pH.
Many pharmaceutical products are electroactive and, therefore, can be determined by voltammetry. However, most of these substances produce signals in the same region of oxidative potentials, which makes it difficult to ...
Chemical characterization and anti-inflammatory and antioxidant potential of fruits of Eugenia candolleana DC
The aim of this study was to present a comprehensive evaluation of the chemical composition, anti-inflammatory and antioxidant activities of the pulp and seeds of Eugenia candolleana fruits collected at two stages of ...
Curcuminoid-Based Responsive Surfaces for Fluorescent BF3 Detection, a Fast and Reversible Approach
The strategic design of a novel curcuminoid (CCMoid), termed PA, containing pyrene units and a terminal carboxylic group provides the necessary tools for its efficient immobilization on surfaces and its potential use as ...
NIR Monitoring and Modelling of Soybean Oil Methanolysis with Multivariate Curve Resolution-Alternating Least Squares with Correlation Constraint
Near infrared spectroscopy in-line monitoring and modelling of soybean oil methanolysis has been done using multivariate curve resolution alternating least squares (MCR-ALS) with correlation constraint. This constraint ...
Glutathione modified screen-printed carbon nanofiber electrode for the voltammetric determination of metal ions in natural samples
This work reports the development of a glutathione modified electrode via electrografting on a screen-printed carbon nanofiber substrate (GSH-SPCNFE). GSH-SPCNFE was compared to a classical screen-printed carbon electrode ...
Green approach for micropollutants removal: Study of constructed wetlands as pretreatment of solar photo-Fenton catalyzed by organic fertilizers
This study proposes a combination of vertical-flow constructed wetlands and solar photo-Fenton catalyzed by Fe-EDTA/DTPA as a greener approach to enhance micropollutant removal from simulated polluted water. In this research, ...
Poly(butylene terephthalate-co-5-tert-butyl isophthalate) Copolyesters: Synthesis, Characterization and Properties
A series of poly(butylene terephthalate) copolyesters containing 5-tert-butyl isophthalate units up to 50%-mole, as well as the homopolyester entirely made of these units, were prepared by polycondensation from the melt. ...
Study of nanoemulsions using carvacrol/MCT-(Oleic acid-potassium oleate)/ Tween 80 ®- water system by low energy method
Carvacrol is studied in different fields due to its microbial and antioxidant properties. Its use is limited because of the water insolubility and its strong taste. To overcome these problems, carvacrol has been successfully ...
Naturally occurring quaternary benzo[c]phenanthridine alkaloids selectively stabilize G quadruplexes
In this work, the interaction of six natural benzo[c]phenanthridine alkaloids (macarpine, sanguilutine, sanguirubine, chelerythrine, sanguinarine and chelirubine) with parallel and antiparallel G-quadruplex DNA structures ...
On-line solid-phase extraction to enhance sensitivity in peptide biomarker analysis by microseparation techniques coupled to mass spectrometry: capillary liquid chromatography versus capillary electrophoresis
In this study, on-line solid-phase extraction capillary liquid chromatography-mass spectrometry (SPE-CapLC-MS) and on-line solid-phase extraction capillary electrophoresis-mass spectrometry (SPE-CE-MS) were compared for ...
A data independent acquisition all ion fragmentation mode tool for the suspect screening of natural toxins in surface water
Among natural freshwater pollutants, cyanotoxins, mycotoxins, and phytotoxins are the most important and less studied. Their identification in surface water is challenging especially cause of the lack of standards and ...
Cálculo de evaporadores de múltiple efecto en paralelo: Parte II. Resolución del modelo matemático y un ejemplo numérico
En el presente artículo se expone la resolución mediante calculador digital, del modelo matemático de evaporadores de múltiple efecto que fue publicado en Química e Industria, en el número del pasado mes de febrero.
Analytical methods for exploring nutraceuticals based on phenolic acids and polyphenols
Phenolic compounds such as phenolic acids, flavonoids, and stilbenes comprise an enormous family of bioactive molecules with a range of positive properties, including antioxidant, antimicrobial or anti-inflammatory effects. ...
Recovery of rare earth elements from acidic mine waters by integration of a selective chelating ion-exchanger and a solvent impregnated resin
A polymeric ion-exchange resin, incorporating methyl-amino-phosphonic (TP260) functionalities, and a solvent impregnated resin (SIR) incorporating tri-methylpentylphosphinic acid (TP272), were evaluated for the selective ...
Remediation of metal-contaminated soils with the addition of materials. Part 2: Leaching tests to evaluate the efficiency of materials in the remediation of contaminated soils
The effect of the addition of materials on the leaching pattern of As and metals (Cu, Zn, Ni, Pb, and Cd) in two contaminated soils was investigated. The examined materials included bentonites, silicates and industrial ...
Solid-phase extraction and field-amplified sample injection-capillary zone electrophoresis for the analysis of benzophenone UV-filters in environmental water samples
A field amplified sample injection-capillary zone electrophoresis (FASI-CZE) method for the analysis of benzophenone (BP) UV-filters in environmental water samples was developed, allowing the separation of all compounds ...
Development and validation of an enzyme linked immunsorbent assay for fluoriquinolones in animal feeds
An enzyme-linked immunosorbent assay (ELISA) for analysis of fluoroquinolones residues in animal feeds has been developed and validated according to Commission Decision 2002/657/EC criteria. Initially, direct and indirect ...
Mercury (II) and methylmercury determination in waters by liquid chromatography hyphenated to cold vapour atomic fluorescence spectrometry after online short-column preconcentration
This paper reports a method developed for the simultaneous determination of methylmercury (MeHg+) and mercury(II) (Hg2+) species in water by liquid chromatography coupled to online UV irradiation and cold vapour atomic ...
Hierarchical meso-mesoporous and macro-mesoporous silica templated by mixtures of polyoxyethylene fluoroalkyl ether and triblock copolymer
We report here the synthesis of different kinds of hierarchical porous silica materials by using mixtures of an amphiphilic block copolymer (Pluronic P123) and a nonionic fluorinated surfactant. In particular, we have taken ...
Capability of Far-Infrared for the selective identification of red and black pigments in paint layers
Artworks are complex objects that merit study and preservation. Far-infrared spectroscopy in ATR mode appears to be a suitable technique for this purpose because it enables information to be obtained regarding the material's ...
