Browsing Articles publicats (Química) by Title
Now showing items 118-137 of 275
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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 ... -
From symmetric glycerol derivatives to dissymmetric chlorohydrins
(Molecular Diversity Preservation International, 2011)The anticipated worldwide increase in biodiesel production will result in an accumulation of glycerol for which there are insufficient conventional uses. The surplus of this by-product has increased rapidly during the last ... -
Fruit characteristics and cuticle triterpenes as related to postharvest quality of highbush blueberries
(Elsevier, 2016-09-15)Chilean fresh blueberries take 20-50 days to arrive by boat to the Northern hemisphere, softening and dehydration being the main defects upon arrival. The effect of maturity at harvest (75% blue, 100% blue, and overripe) ... -
Fruit cuticle composition of a melting and a nonmelting peach cultivar
(American Chemical Society, 2014-03-28)Although postharvest quality of fruit is greatly affected by cuticle composition, structure, and properties, very few published studies have analyzed fruit cuticle composition from a postharvest perspective. In this work, ... -
Full description of copper uptake by algal biomass combining an equilibrium NICA model with a kinetic intraparticle diffusion driving force approach
(Elsevier, 2011)In this work kinetic and equilibrium studies related to copper binding to the protonated macroalga Sargassum muticum are reported. An intraparticle-diffusion linear driving force (LDF) model has been chosen for the ... -
Full-wave analysis of stripping chronopotentiograms at scanned deposition potential (SSCP) as a tool for heavy metal speciation: Theoretical development and application to Cd(II)-phthalate and Cd(II)-iodide systems
(Elsevier, 2007)A new mathematical treatment has been developed and implemented in an EXCEL spreadsheet in order to determine average equilibrium functions from the full set of data measured by scanning stripping chronopotentiometry (SSCP) ... -
Gene and QTL detection in a three-way barley cross under selection by a mixed model with kinship information using SNPs
(Springer Verlag, 2011)Quantitative trait locus (QTL) detection is commonly performed by analysis of designed segregating populations derived from two inbred parental lines, where absence of selection, mutation and genetic drift is assumed. Even ... -
Gibbs-Donnan and specific ion interaction theory descriptions of the effect of ionic strength on proton dissociation of alginic acid
(Elsevier, 2004)The apparent proton dissociation constants of a commercial alginic acid have been obtained in KNO3 and NaCl at concentrations ranging between 0.01 and 2 mol·L-1. An analysis of the dependence on the ionic strength at a ...