Browsing Articles publicats (Química) by Title
Now showing items 118-137 of 223
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H3PO4/metal halide induces a one-pot solvent-free esterification–halogenation of glycerol and diols
(Royal Society of Chemistry, 2013)As part of our continued effort to achieve the synthesis of halohydrin esters from polyols by a sustainable method, here we report on a multicomponent inorganic acid-mediated solvent-free synthesis. The synthesis was ... -
Heading date QTL in a spring × winter barley cross evaluated in Mediterranean environments
(Springer Verlag, 2008)Heading date is a key trait for the adaptation of barley to Mediterranean environments. We studied the genetic control of flowering time under Northern Spanish (Mediterranean) conditions using a new population derived from ... -
Hierarchical self-assembly of di-, tri- and tetraphenylalanine peptides capped with two fluorenyl functionalities: from polymorphs to dendrites
(Royal Society of Chemistry, 2016)Homopeptides with 2, 3 and 4 phenylalanine (Phe) residues and capped with fluorenylmethoxycarbonyl and fluorenylmethyl esters at the N-terminus and C-terminus, respectively, have been synthesized to examine their self-assembly ... -
Identification of carotenoids using mass spectrometry
(Wiley Periodicals, 2014)The present review compiles positive MS fragmentation data of selected carotenoids obtained using various ionization techniques and matrices. In addition, new experimental data from the analysis of carotenoids in transgenic ... -
In situ measurements of micronutrient dynamics in open seawater show that complex dissociation rates may limit diatom growth
(Nature Research, 2018-12)In this first in situ study of the dynamic availability of phytoplankton micronutrients, a SeaExplorer glider was combined with Diffusive Gradients in Thin Films and deployed in the Mediterranean Sea. On the basis of their ... -
Increased straight-chain esters content after ultra low oxygen storage and its relation to the lipoxygenase system in 'Golden Reinders (R)' apples
(Springer Verlag, 2011-01-00)Golden’ is the most cultivated apple group in Europe. In recent years, new mutants have emerged which improve both aspects of production and sensory attributes. In this work, emission of volatile compounds and the activity ... -
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 ... -
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 ... -
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 ... -
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 ...