Enginyeria Química i Química Analítica: Enviaments recents
Ara mostrant els elements 101-120 de 790
Lupinus mutabilis oil obtained by expeller press: Yield, physicochemical characterization, antioxidant capacity, fatty acids and oxidative stability analyses
The oil of debittered and dehulled grains from two Andean lupins (Lupinus mutabilis) from Peru, Andenes and Común, was extracted by expellerpress. The extraction yield and the proximal composition of both varieties were ...
Descomposición fotoquímica de soluciones acuosas de dodecilbenceno sulfonato sódico en un fotoreactor anular contínuo de mezcla perfecta
La fotodescomposición de dodecilbencenosulfato sódico (DBS) se ha estudiado como un proceso de purificación del agua. Soluciones acuosas de DBS han sido irradiadas en un fotorreactor anular de mezcla perfecta, aplicándose ...
Systematic kinetic modeling of the propyl tert-butyl ether synthesis reaction
The kinetics of the liquid-phase addition of 1-propanol to isobutene to produce propyl tert-butyl ether (PTBE) has been studied using the ion-exchange resin Amberlyst¿ 35 as the catalyst. Reaction rates free from mass ...
Trends in LC-MS and LC-HRMS analysis and characterization of polyphenols in food
Polyphenols comprise a large family of naturally occurring secondary metabolites of plant-derived foods and are among the principal micronutrients associated with the health beneficial effects of our diet. Liquid chromatography ...
Analysis of UV ink photoinitiators in packaged food by fast liquid chromatography at subambient temperature coupled to tandem mass spectrometry
A fast method of liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS) was developed for the analysis of eleven UV ink photoinitiators in packaged food. Chromatographic separation was achieved in a ...
Characterization of Sparkling Wines According to Polyphenolic Profiles Obtained by HPLC-UV/Vis and Principal Component Analysis
Cava is a sparkling wine obtained by a secondary fermentation in its own bottle. Grape skin contains several compounds, such as polyphenols, which act like natural protectors and provide flavor and color to the wines. In ...
Nucleic acid i-motif structures in analytical chemistry
Under the appropriate experimental conditions of pH and temperature, cytosine-rich segments in DNA or RNA sequences may produce a characteristic folded structure known as an i-motif. Besides its potential role in vivo, ...
Adsorption of C1-C4 alcohols, C4-C5 isoolefins and their corresponding ethers over Amberlyst™35
An experimental liquid- and gas-phase adsorption study of C1-C4 alcohols, C4-C5 isoolefins, and the tert-alkyl ethers obtained thereof over Amberlyst¿35 is presented. Liquid-phase adsorption experiments were performed in ...
Simultaneous determination of 210Pb and 90Sr and 210Po isolation in sludge samples using a plastic scintillation resin
This study describes a new and fast method for separating 210Po from 210Pb and 90Sr, before simultaneously measuring the individual activities of the latter two radionuclides using a plastic scintillation resin (PSresin) ...
El método del caso aplicado a la enseñanza de la química
La Sociedad demanda de los profesionales de la QuÌmica unos requisitos que la Universidad ha de satisfacer a lo largo del proceso de formaciÛn. AsÌ, los futuros quÌmicos han de adquirir los conocimientos tÈcnicos, la ...
Unveiling the functional components and antivirulence activity of mustard leaves using an LC-MS/MS, molecular networking, and multivariate data analysis integrated approach
Plant extracts have recently received increased attention as alternative sources of antimicrobial agents in thefight against multidrug-resistant bacteria. Non-targeted metabolomics liquid chromatography-quadrupole timeof-flight ...
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 ...
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 ...
Atomistic simulations of the structure of highly crosslinked poly(styrene-co-divinylbenzene) ion exchange resins
The microscopic structures of highly crosslinked sulfonated poly(styrene-co-divinylbenzene) resins have been modeled by generating atomistic microstructures using stochastic-like algorithms, which are subsequently relaxed ...
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 ...
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 ...
Study on the removal of biodegradable NOM from seawater using biofiltration
Despite the low biodegradability of seawater NOM, problems associated with biofouling are common in facilities that handle seawater. In this work, a fixed-film aerobic biofilter is proposed as an effective unit for preventing ...
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 ...
Sorption of perfluoroalkyl substances in sewage sludge
The sorption behaviour of three perfluoroalkyl substances (PFASs) (perfluorooctanesulfonic acid (PFOS), perfluorooctanoic acid (PFOA) and perfluorobutanesulfonic acid (PFBS)) was studied in sewage sludge samples. Sorption ...
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.
