Browsing Articles publicats (Química) by Title
Now showing items 68-87 of 313
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Combining biocatalysts to achieve new phase change materials. Application to non-edible animal fat
(Elsevier, 2018)The thermal properties of various alkyl threo-9, 10-dihydroxystearates (DHSEs) prepared from non-edible fat were studied. Non-edible animal fat was hydrolyzed in a 93% yield with R. oryzae resting cells. Crude unsaturated ... -
Combining regio- and enantioselectivity of lipases for the preparation of (R)-4-chloro-2-butanol
(Wiley, 2007)Preparation of 98% ee (R)-4-chloro-2-butanol was carried out by the enzymatic hydrolysis of chlorohydrin esters, using fungal resting cells and commercial enzymes. Hydrolyzes were carried out using lipases from Candida ... -
Comment on: Deuterium nuclear fusion at room temperature: A pertinent inequality on barrier penetration
(American Institute of Physics, 1990-10-15) -
Comparison of different speciation techniques to measure Zn availability in hydroponic media
(Elsevier, 2018-12)Four analytical techniques are compared: AGNES (Absence of Gradients and Nernstian Equilibrium Stripping), LASV (Anodic Stripping Voltammetry with Linear stripping), DGT (Diffusive Gradients in Thin films) and PIM (Polymer ... -
Comparison of volatile profile and sensory analysis of 'Golden Reinders' apples after the application of a cold air period after ultralow oxygen (ULO) storage
(American Chemical Society, 2011)All efforts to improve fruit quality are rewarded when consumers are satisfied after tasting the fruit. Apples are often stored under controlled atmosphere conditions to preserve them over time, but this frequently results ... -
Competition effects in cation binding to humic acid: conditional affinity spectra for fixed total metal concentration conditions
(Elsevier, 2010)Information on the Pb and Cd binding to a purified Aldrich humic acid (HA) is obtained from the influence of different fixed total metal concentrations on the acid-base titrations of this ligand. NICA (Non-Ideal Competitive ... -
Competitive Cd2+/H+ complexation to polyacrylic acid described by the stepwise and intrinsic stability constants
(American Chemical Society, 2008)Stepwise constants can be used to describe competitive proton and metal binding to macromolecules with a large number of sites. With the aim of accessing information on the microscopic binding model, we report an expression ... -
Competitive Ion Complexation to Polyelectrolytes: Determination of the Stepwise Stability Constants. The Ca2+/H+/Polyacrylate System
(American Chemical Society, 2007)This work presents a new methodology aimed at obtaining the stepwise stability constants corresponding to the binding of ions (or other small molecules) to macromolecular ligands having a large number of sites. For complexing ... -
Complexation to macromolecules with a large number of sites
(American Institute of Physics, 1999)This paper presents an approach based on the saddle-point approximation to study the equilibrium interactions between small molecules and macromolecules with a large number of sites. For this case, the application of the ... -
Compositional, structural and functional cuticle analysis of Prunus laurocerasus L. sheds light on cuticular barrier plasticity
(Elsevier, 2020-11-24)Barrier properties of the hydrophobic plant cuticle depend on its physicochemical composition. The cuticular compounds vary considerably among plant species but also among organs and tissues of the same plant and throughout ... -
Comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry to assess the presence of α,α-trehalose and other disaccharides in apple and peach
(John Wiley & Sons, 2015)Introduction Carbohydrates are important constituents in fruits. Among the carbohydrates, disaccharides have rarely been studied in apple and peach. Indeed, the abiotic stress biomarker and preservation agent α,α-trehalose ... -
Computing steady-state metal flux at microorganism and bioanalogical sensor interfaces in multiligand systems. A reaction layer approximation and its comparison with the rigorous solution
(The Royal Society of Chemistry, 2007)In complicated environmental or biological systems, the fluxes of chemical species at a consuming interface, like an organism or an analytical sensor, involve many coupled chemical and diffusion processes. Computation of ... -
Concentrations of selected chemicals in indoor air from Norwegian homes and schools
(Elsevier, 2019-04-09)Both building materials and consumer products have been identified as possible sources for potentially hazardous substances like phthalates, polychlorinated biphenyls (PCBs), organophosphorous flame retardants (OPFRs), ... -
Conditional equilibrium constants in multicomponent heterogeneous adsorption: The conditional affinity spectrum
(American Institute of Physics, 2006)The concept of conditional stability constant is extended to the competitive binding of small molecules to heterogeneous surfaces or macromolecules via the introduction of the conditional affinity spectrum (CAS). The CAS ... -
Critical review of analytical methods for the determination of flame retardants in human matrices
(Elsevier, 2022)Human biomonitoring is a powerful approach in assessing exposure to environmental pollutants. Flame retardants (FRs) are of particular concern due to their wide distribution in the environment and adverse health effects. ... -
Cuticular hydrocarbons discriminate cryptic Macrolophus species (Hemiptera: Miridae)
(Cambridge University Press, 2012-12)Macrolophus pygmaeus is commercially employed in the biological control of greenhouse and field vegetable pests. It is morphologically undistinguishable from the cryptic species M. melanotoma, and this interferes with the ... -
Cuticular wax composition of ʻCelesteʼ and ʻSomersetʼ cherry fruit
(International Society for Horticultural Science (ISHS), 2017)The cuticular layer plays an important role in protecting fruits against water loss and invasive microorganisms and insects, both during on-tree development and postharvest storage. There is also experimental evidence that ... -
Dealing with long‐range interactions in the determination of polyelectrolyte ionization properties. Extension of the transfer matrix formalism to the full range of ionic strengths
(Wiley, 2016-11-14)The ionization state of charged macromolecules in solution is usually determined by the extent of the binding processes. These processes are very sensitive to the ionic strength of the medium, which are of long-range nature. ... -
Detection of silver nanoparticles in seawater at ppb levels using UV-visible spectrophotometry with long path cells
(Elsevier, 2017-03-01)Silver nanoparticles (AgNPs) are emerging contaminants that are difficult to detect in natural waters. UV-visible spectrophotometry is a simple technique that allows detection of AgNPs through analysis of their characteristic ... -
Determinación rápida del contenido en cromo en licores y baños de curtición
(Asociación Química Española de la Industria del Cuero, 2000)En el presente trabajo se presenta una nueva metodología desarrollada para la determinación de cromo en licores de curtición y baños residuales, basada en la espectrofotometría y la utilización de calibración multivariante. ...