Enginyeria Química i Química Analítica: Envíos recientes
Mostrando ítems 221-240 de 791
Understanding the formation of heartwood in Larch using synchrotron infrared imaging combined with multivariate analysis and atomic force microscope infrared spectroscopy
Formation of extractive-rich heartwood is a process in live trees that make them and the wood obtained from them more resistant to fungal degradation. Despite the importance of this natural mechanism, little is known about ...
Aplicació de l'aprenentatge basat en problemes als graus i màsters en química de la Universitat de Barcelona
El aprendizaje basado en problemas (ABP) consiste en utilizar problemas como elemento clave para la adquisición e integración de nuevos conocimientos. Esta metodología se centra en los estudiantes e implica trabajo ...
New approaches to antimony film screen-printed electrodes using carbon-based nanomaterials substrates
Three different commercial carbon nanomaterial-modified screen-printed electrodes based on graphene, carbon nanotubes and carbon nanofibers were pioneeringly tested as electrode platforms for the plating with Sb film. They ...
New macroporous support for the preparation of plastic scintillation resins
<p>PSresins have arisen in the past years as a promising material for the measurement of radioactivity. PSresins are a</p><p>material composed of a PSm support coated with a selective extractant on its surface, allowing ...
Assessment of ion-exchange resins as catalysts for the direct transformation of fructose into butyl levulinate
The transformation of fructose into butyl levulinate in aqueous 1-butanol (initial molar ratio 1-butanol/fructose 79, and butanol/water 1.19) has been studied in a discontinuous reactor at 80-120C and 2.0 MPa over 8 ...
Dependence of samarium-soil interaction on samarium concentration: Implications for environmental risk assessment
The sorption and desorption behaviour of samarium (Sm), an emerging contaminant, was examined in soil samples at varying Sm concentrations. The obtained sorption and desorption parameters revealed that soil possessed a ...
Characterization and Classification of Spanish Honey by Non-targeted LC-HRMS (Orbitrap) Fingerprinting and Multivariate Chemometric Methods
A non-targeted LC-HRMS fingerprinting methodology using an Orbitrap mass analyzer, and based on C18 reversed-phase mode under universal gradient elution, was developed to characterize and classify Spanish honey samples. A ...
Determination of polyphenols in white wines by liquid chromatography: application to the characterization of Alella (Catalonia, Spain) wines using chemometric methods
The determination of polyphenols in wines is of great interest in the field of food analysis due to health and organoleptic implications. In addition, the applicability of polyphenols as food descriptors to be used for ...
Solubility, aggregation and stability of Amphotericin B drug in pure organic solvents: Thermodynamic analysis and solid form characterization.
The solubility of amphotericin B (AmB) has been studied between temperatures of 298-343 K in a range of pure organic solvents including methanol, ethanol, isopropanol, butanol, acetone, tetrahydrofuran, and 1,4-dioxane. ...
Performance and kinetic modelling of photolytic and photocatalytic ozonation for enhanced micropollutants removal in municipal wastewaters
In this work, the performances of ozonation, photolytic ozonation (UV-C/O3), and photocatalytic ozonation (UV-A/TiO2/O3) in degrading ozone recalcitrant micropollutants in four different real domestic wastewaters were ...
Scintillation for the future in a changing world
Liquid Scintillation has two main characteristics: the lack of resolution and the capability to determine alpha and beta emitters. Society evolves toward a situation where information is key for management and where ...
Effects of the fruit ripening stage on antioxidant capacity, total phenolics, and polyphenolic composition of crude palm oil from interspecific hybrid Elaeis oleifera × Elaeis guineensis
In the present study, we assessed for the first time the changes in the antioxidant capacity, total phenolic content, and polyphenolic composition of interspecific hybrid palm oil extracted from Elaeis oleifera x Elaeis ...
Effects of sample processing on arsenic speciation in marine macroalgae.
The stability of arsenic species in environmental samples during sampling, storage and processing is crucial for speciation studies. Losses, interconversion and degradation of arsenocompounds can occur during these steps ...
Critical comparison of shake-flask, potentiometric and chromatographic methods for lipophilicity evaluation (log Po/w) of neutral, acidic, basic, amphoteric, and zwitterionic drugs
In the present study three different procedures have been compared for the determination of the lipophilicity of the unionized species (log Po/w) of neutral, acidic, basic, amphoteric, and zwitterionic drugs. Shake-flask, ...
Improving separation optimization in capillary electrophoresis by using a general quality criterion
In this paper we extend the use of the quality criterion t' to optimize separations in capillary electrophoresis (CE). The theoretical parameter t' takes into account not only the relative separation between a given pair ...
Characterization of aggregates of surface modified fullerenes by asymmetrical flow field-flow fractionation with multi-angle light scattering detection
Fullerenes are carbon nanoparticles with widespread biomedical, commercial and industrial applications. Attributes such as their tendency to aggregate and aggregate size and shape impact their ability to be transported ...
Evaluation of the main active species involved in the TiO2 photocatalytic degradation of ametryn herbicide and its by-products
In this study, we investigated the effectiveness of photocatalysis using TiO2 as catalyst on the removal of ametryn. The evaluation of photocatalytic activity under simulated sunlight was discussed as evidence by numerous ...
Energy consumption in sharp and non-sharp splits of ideal ternary mixtures
Most of the distillation processes deal with multicomponent mixtures, existing a great quantity of distillation sequences for this process. The sharp splits available for an ideal ternary mixture are the direct and the ...
Recent Trends in the Improvement of the Electrochemical Response of Screen-Printed Electrodes by Their Modification with Shaped Metal Nanoparticles
Novel sensing technologies proposed must fulfill the demands of wastewater treatment plants, the food industry, and environmental control agencies: simple, fast, inexpensive, and reliable methodologies for onsite screening, ...
Told through the wine: a liquid chromatography-mass spectrometry interplatform comparison reveals the influence of the global approach on the final annotated metabolites in non-targeted metabolomics
This work focuses on the influence of the selected LC-HRMS platform on the final annotated compounds in non-targeted metabolomics. Two platforms that differed in columns, mobile phases, gradients, chromatographs, mass ...
