Browsing Articles publicats (Química) by Title
Now showing items 118-137 of 294
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Electrostatic and specific binding to macromolecular ligands: a general analytical expression for the Donnan volume
(Elsevier, 2007)The dependence of the apparent acid dissociation constant of charged polyacids on the ionic strength and on the degree of dissociation is analysed in terms of the Donnan model. We introduce a new approximate analytical ... -
Electrostatic Effects in Biosorption. The Role of the Electrochemistry
(Sociedade Portuguesa de Electroquímica, 2007)Biosorption is the passive sequestration of pollutants by non-metabolizing non-living biomass. The technique emerged in 1980's as a possible alternative method for wastewater treatments in an environmentally friendly manner. ... -
Elongation of the Hydrophobic Chain as a Molecular Switch:Discovery of Capsaicin Derivatives and Endogenous Lipids as Potent Transient Receptor Potential Vanilloid Channel 2 Antagonists
(American Chemical Society, 2018-09-03)The transient receptor potential vanilloid type-2 (TRPV2) protein is a nonselective Ca2+ permeable channel member of the TRPV subfamily, still considered an orphan TRP channel due to the scarcity of available selective and ... -
Entirely solvent-free biocatalytic synthesis of solketal fatty esters from soybean seeds
(Académie des Sciences; Elsevier, 2016)Solvent-free reactions are the systems of choice in green chemistry. In addition to contributing to lowering the environmental impact of chemical processes, solvent-free systems can reduce production costs, reaction times, ... -
Entrapment in polymeric material of resting cells of Aspergillus flavus with lipase activity. Application to the synthesis of ethyl laurate
(Royal Society of Chemistry, 2014)The lipase activity of resting cells of Aspergillus flavus was improved by entrapment in various polymeric acrylates (PAAFs). Commercially available ethyl acrylate, butyl acrylate and ethyl methacrylate, and acrylates ... -
Envasado de cerezas 'Sweet Heart' en atmósfera modificada: calidad y compuestos bioactivos
(Interempresas Media, 2013)Para evitar el rápido deterioro de las cerezas en la fase poscosecha es conveniente aplicar tratamientos que frenen la maduración del fruto, y, en consecuencia, que ayuden a mantener su calidad y contenido en compuestos ... -
Environmental life cycle assessment of rapeseed straight vegetable oil as self-supply agricultural biofuel
(Elsevier, 2013-02)Biofuels are nowadays considered a questionable environmental alternative to fossil fuels. In that context, this work analyses the environmental impacts when introducing rapeseed on the traditional and current wheat and ... -
Esterification of oleic acid catalayzed by an Aspergillus niger strain. Influence of water activity and alcohol concentration
(Facultad de Ciencias de la Universidad del Tolima, 2006)Effects of water activity and 1-propanol concentration on synthesis of propyl oleate from oleic acid using Aspergillus niger cell-bound lipases in isooctane are described. A. niger produces lipases (EC 3.1.1.3) which partly ... -
Evaluation of the Koutecký-Koryta approximation for voltammetric currents generated by metal complex systems with various labilities
(Elsevier, 2002)The voltammetric response of metal complex systems with various labilities is analyzed by rigorous numerical simulation with the Finite Element Method of the time-dependent concentration profiles of the different species. ... -
Evaluation of thin mercury film rotating disk electrode to perform absence of gradients and Nernstian equilibrium stripping (AGNES) measurements
(Elsevier, 2010)In the present work, the applicability of thin mercury film on a rotating disk electrode (TMF-RDE), to assess the free metal ion concentration by the absence of gradients and Nernstian equilibrium stripping (AGNES), is ... -
Experimental evidences for a new model in the description of the adsorption-coupled reduction of Cr(VI) by protonated banana skin
(Elsevier, 2013)This work reports experimental evidences, not previously considered, to evaluate the Cr(VI) removal by protonated banana skin biomass. Variations in the number of hydroxyl groups, quantified by potentiometric titrations, ... -
Experimental verification of the metal flux enhancement in a mixture of two metal complexes: the Cd/NTA/glycine and Cd/NTA/citric acid systems
(The Royal society of Chemistry, 2010)Rigorous computation of the metal flux crossing a limiting surface of a system that contains a mixture of 1 : 1 metal complexes under steady-state planar diffusion in a finite domain and under excess of ligand conditions ... -
Extending the use of Diffusive Gradients in Thin Films (DGT) to solutions where competition, saturation, and kinetic effects are not negligible
(American Chemical Society, 2017-06-20)DGT (Diffusion Gradients in Thin films) was designed to sample trace metals in situ at their natural concentrations. The setup and the experimental deployment conditions were established to allow interpretation of a linear ... -
Fast quantitative method for the analysis of carotenoids in transgenic maize
(American Chemical Society, 2013)A fast method was developed to determine carotenoid content in transgenic maize seeds. The analysis was carried out using an ultrahigh-pressure liquid chromatograph coupled to a photodiode array detector and a mass ... -
Fatty acid eutectic mixtures and derivatives from non-edible animal fat as phase change materials
(Royal Society of Chemistry, 2017)A set of compounds from non-edible fat waste was prepared and their thermal behavior was studied. The fat was hydrolyzed and crystallized in a simple and robust process to yield palmitic acid-stearic acid (PA-SA) mixtures. ... -
Firmness at harvest impacts postharvest fruit softening and internal browning development in mechanically damaged and non-damaged highbush blueberries (Vaccinium corymbosum L.)
(Frontiers Media, 2017-04-11)Fresh blueberries are very susceptible to mechanical damage, which limits postharvest life and firmness. Softening and susceptibility of cultivars 'Duke' and 'Brigitta' to developing internal browning (IB) after mechanical ... -
Foreword to the special issue from the Interfaces Against Pollution 2016 Conference: Environmental challenges and opportunities
(CSIRO Publishing, 2017-01-01) -
Free indium concentration determined with AGNES
(Elsevier, 2018)Indium is increasingly used in electronic devices, from which it can be mobilized towards environmental compartments. Speciation of In in waters is important for its direct ecotoxicological effects, as well as for the fate ... -
Free Zn2+ determination in natural freshwater of the Pyrenees: towards on-site measurements with AGNES
(CSIRO Publishing, 2015)An on-site methodology has been developed for the direct determination of free Zn2+ with AGNES (Absence of Gradients and Nernstian Equilibrium Stripping) in freshwaters. This implementation includes: i) the use of screen ... -
Free Zn2+ determination in systems with Zn-Glutathione
(Elsevier, 2015-11-01)Zn-Glutathione speciation was studied applying the electrochemical technique AGNES (Absence of Gradients and Nernstian Equilibrium Stripping) to determine the free zinc concentration. In titrations varying either pH, total ...