Browsing Articles publicats (Química) by Title
Now showing items 158-177 of 294
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Influence of sample processing on the analysis of carotenoids in maize
(Molecular Diversity Preservation International, 2012)We performed a number of tests with the aim to develop an effective extraction method for the analysis of carotenoid content in maize seed. Mixtures of methanol–ethyl acetate (6:4, v/v) and methanol–tetrahydrofuran (1:1, ... -
Influence of the combination of different atmospheres on diphenylamine, folpet and imazalil content in cold-stored 'Pink Lady®' apples
(Elsevier, 2009)"Pink Lady®" apples were harvested at commercial maturity, treated with three different agrochemical products, and stored at 1 °C under either air or controlled atmosphere conditions (2 kPa O2 + 2 kPa CO2 and 1 kPa O2 + 1 ... -
Influence of the settling of the resin beads on diffusion gradients in thin films measurements
(Elsevier, 2015-05-02)Binding resin beads used in DGT (Diffusion Gradients in Thin films) tend to settle to one side of the resin during casting. This phenomenon might be relevant for metal accumulation when partially labile complexes dominate ... -
Injection-port derivatization coupled to GC–MS/MS for the analysis of glycosylated and non-glycosylated polyphenols in fruit samples
(Elsevier, 2016)Polyphenols, including glycosylated polyphenols, were analyzed via a procedure based on injection-port derivatization coupled to gas chromatography–tandem mass spectrometry (GC–MS/MS). The polyphenols in lyophilized fruit ... -
Insecticidal and repellent action of allyl esters against Acyrthosiphon pisum (Hemiptera: Aphididae) and Tribolium castaneum (Coleoptera: Tenebrionidae)
(Elsevier, 2013)In this project, three allyl esters from middle-chain fatty acids (allyl octanoate, allyl heptanoate and allyl hexanoate) and two from aromatic acids (allyl cinnamate and allyl 2-furoate) were investigated against two ... -
Insights into olive fruit surface functions: a comparison of cuticular composition, water permeability, and surface topography in nine cultivars during maturation
(Frontiers Media, 2019-10-25)Olive (Olea europaea L.) growing has outstanding economic relevance in Spain, the main olive oil producer and exporter in the world. Fruit skin properties are very relevant for fruit and oil quality, water loss, and ... -
Integrated valorization of Sargassum muticum in biorefineries
(Elsevier, 2021-01-15)Marine macroalgae represent an excellent raw material for the production of bioactives, adsorbents, plant biostimulants, soil fertilizers and biogas. The success in the exploitation of seaweeds depends on their characteristics, ... -
Interaction of acrylic-maleic copolymers with H+, Na+, Mg2+ and Ca2+: Thermodynamic parameters and their dependence on medium
(Elsevier, 2005)Thermodynamic parameters for the interaction of two acrylic-maleic copolymers (MW = 3 and 70 kDa) with H+, Na+, Mg2+ and Ca2+ were obtained from potentiometric and calorimetric measurements. Apparent protonation constants were ... -
Interactions of Cadmium(II) and protons with dead biomass of marine algae Fucus sp.
(Elsevier, 2006)Samples of dead biomass from the marine brown algae Fucus ceranoides, F. vesiculosus and F.serratus were studied for their ability to remove cadmium from aqueous solutions. The metal sorption process is rapid, with 90% ... -
Interpretation of diffusion gradients in thin films (DGT) measurements: a systematic approach
(CSIRO Publishing, 2015)Gaining insight into the physicochemical processes integrated in a DGT (diffusion gradients in thin films) measurement and combining them in a model can assist in retrieving fundamental information, both qualitative and ... -
Interpreting ion fluxes to channel arrays in monolayers
(American Chemical Society, 2007)The exponentially decaying permeability model interprets the chronoamperometric currents arising from Tl+ reduction at a Hg electrode covered with a phospholipid monolayer (DOPC) containing gramicidin monomer by combining ... -
Introducing Lipophilicity to (Polyhydroxyalkyl) thiazolidine Carboxylic Acids Via Acylation
(American Chemical Society, 2022)he therapeutic efficacy of bioactive compounds isrelated to their bioavailability. In turn, the bioavailability dependson the equilibrium between the hydrophilicity and the lipophilicity.2(R,S)-(Polyhydroxyalkyl)thiazoli ... -
Ion binding to polyelectrolytes: Monte Carlo simulations versus classical mean field theories
(Springer Verlag, 2009)The influence of ion size and surface charge model in titrations of ionizable polyelectrolytes is studied by means of the Semi Grand Canonical Monte Carlo simulation method in the context of the primitive model. Three ... -
Ionization and Conformational Equilibria of Citric Acid: Delocalized Proton Binding in Solution
(American Chemical Society, 2017-07-13)The microspeciation of citric acid is studied by analyzing NMR titration data. When the site binding (SB) model, which assumes fully localized proton binding to the carboxylic groups, is used to obtain microscopic energy ... -
Iron Speciation in Fram Strait and Over the Northeast Greenland Shelf: An Inter-Comparison Study of Voltammetric Methods
(Frontiers Media, 2021-01-21)Competitive ligand exchange - adsorptive cathodic stripping voltammetry (CLE-AdCSV) is a widely used technique to determine dissolved iron (Fe) speciation in seawater, and involves competition for Fe of a known added ligand ... -
Is it possible to substitute hexane with green solvents for extraction of carotenoids? A theoretical versus experimental solubility study
(Royal Society of Chemistry, 2016)The present study was designed to evaluate five green solvents, i.e. 2-methyltetrahydrofuran (2-MeTHF), dimethyl carbonate (DMC), cyclopentyl methyl ether (CPME), isopropyl alcohol (IPA) and ethyl acetate, for the substitution ... -
Labile trace metal concentration measurements in marine environments: From coastal to open ocean areas
(Elsevier, 2019-05-06)In seawater, trace metals occur in many forms: free ion, labile and non-labile complex, colloid, associated with particles, but only free ions and very labile metal complexes can cross the phytoplankton membrane and be ... -
Lability and mobility effects on mixtures of ligands under steady-state conditions
(Royal Society of Chemistry, 2003)Analytical solutions for the steady-state flux arriving at an active surface from a mixture (in which one active species reacts with non-active ligands in the medium) can be helpful in a variety of problems: voltammetric ... -
Lability of complexes in steady-state finite planar diffusion
(Elsevier, 2006)The analytical solution of the reaction-diffusion problem of a species forming a complex (with any association and dissociation rate constants) in solution and disappearing at an active planar surface is presented for a ... -
Las propiedades antioxidantes de la cereza 'Sweetheart' protegen al fruto del deterioro post-cosecha
(Interempresas Media, 2013)Los mecanismos enzimáticos de modificación de las paredes celulares, que resultan en cambios en la firmeza, la textura y la calidad general del fruto durante su vida postcosecha, han sido históricamente el objetivo preferente ...