Enginyeria Química i Química Analítica: Envíos recientes
Mostrando ítems 361-380 de 791
Cryptosporidium sp. in public swimming pools in Barcelona
Podeu consultar el llibre complet a: http://hdl.handle.net/2445/32392
Recovery of added-value compounds from orange and spinach processing residues: green extraction of phenolic compounds and evaluation of antioxidant activity
Phenolic compounds recovery by mechanical stirring extraction (MSE) was studied from orange and spinach wastes using water as a solvent. The statistical analysis showed that the highest total polyphenol content (TPC) yield ...
Phosphorene and other layered pnictogens as a new source of 2D materials for electrochemical sensors
Following the great success of graphene as a versatile 2D nanomaterial for the design of electrochemicalsensors, this review focuses on the synthesis, characterization, and electrochemical sensing applicationsof alternative ...
Experimental and Modeling Study of the Nanofiltration of Alcohol-Based Molecules and Amino Acids by Commercial Membranes
The nanofiltration performance of three commercial membranes was analyzed by the Steric Pore Model (SPM) and the extended Nernst–Planck diffusion equation inside membrane pores. The model was completed with the equation ...
Polyphenolic Profiling of Coffee Beverages by Liquid Chromatography-High-Resolution Mass Spectrometry for Classification and Characterization
The importance of monitoring the presence of bioactive compounds as food attributes for sample classification and characterization is increasing. In this study, targeted Liquid Chromatography coupled with High-Resolution ...
Enhanced voltammetric determination of metal ions by using a bismuthene-modified screen-printed electrode
A new bismuthene carbon-based screen-printed electrode (2D Bi exf -SPCE) was easily prepared, taking advantage of the strongest features of exfoliated layered bismuth (bismuthene) for metal ions detection by differential ...
Crown ether-modified electrodes for the simultaneous stripping voltammetric determination of Cd(II), Pb(II) and Cu(II)
This work describes the immobilization of 4-carboxybenzo-18-crown-6 (CB-18-crown-6) and 4-carboxybenzo-15-crown-5 (CB-15-crown-5) assisted by lysine on aryl diazonium salt monolayers anchored to the surface of graphite-epoxy ...
Combining Hyperspectral Imaging and Chemometrics to Assess and Interpret the Effects of Environmental Stressors on the Organism at Tissue Level
Changes on an organism by the exposure to environmental stressors may be characterized by hyperspectral images (HSI), which preserve the morphology of biological samples, and suitable chemometric tools. The approach proposed ...
Antimonene-modified screen-printed carbon nanofibers electrode for enhanced electroanalytical response of metal ions.
A two-dimensional (2D) Sb-modified screen-printed carbon nanofibers electrode (2D Sbexf-SPCNFE) was developed to improve the stripping voltammetric determination of Cd(II) and Pb(II), taking advantage of the synergistic ...
Crystallization and properties of poly(ethylene terephtalate) copolymers containing 5-tert-butyl isophtalic units
The influence of incorporating 5-tert-butyl isophthalic units (tBI) in the polymer chain of poly(ethylene terephthalate) (PET) on the crystallization behavior, crystal structure, and tensile and gas transport properties ...
Understanding the effect of the nature of the nucleobase in the loops on the stability of the i-motif structure
The nature and length of loops connecting cytosine tracts in i-motif structures may affect their stability. In this work, the influence of the nature of the nucleobases located in two of the loops of an intramolecular ...
Carbon based electrodes for the voltammetric determination of capsaicin in spicy samples
A voltammetric sensor based on the modification of a screen-printed carbon electrode with reduced graphene oxide (rGO-SPCE) is presented for the cyclic voltammetric determination of capsaicin in a wide range of concentrations. ...
The buckwheat iminosugar d-fagomine attenuates sucrose-induced steatosis and hypertension in rats
Scope: This study examines the long-term functional effects of D-fagomine on sucrose4 induced factors of metabolic dysfunctions and explores possible molecular mechanisms behind its action. Methods & results: Wistar Kyoto ...
Determination of thermodynamic properties for the esterification of levulinic acid with 1-butene
The thermodynamic equilibrium of the liquid phase esterification of levulinic acid (LA) with 1-butene (1B) to obtain sec-butyl levulinate (SBL) was studied. Equilibrium experiments were performed in a batch reactor at 2.5 ...
Metabolic profiling for the identification of Huntington biomarkers by on-line solid-phase extraction capillary electrophoresis mass spectrometry combined with advanced data analysis tools
In this work, an untargeted metabolomic approach based on sensitive analysis by on-line solid-phase extraction capillary electrophoresis mass spectrometry (SPE-CE-MS) in combination with multivariate data analysis is ...
Sensitive analysis of recombinant human erythropoietin glycopeptides by on-line phenylboronic acid solid-phase extraction capillary electrophoresis-mass spectrometry
In this study, several chromatographic sorbents: porous graphitic carbon (PGC), aminopropyl hydrophilic interaction (aminopropyl-HILIC), and phenylboronic acid (PBA) were assessed for the analysis of glycopeptides by on-line ...
Effect of ageing on the availability of heavy metals in soils amended with compost and biochar: evaluation of changes in soil and amendment properties
Remediation strategies using soil amendments should consider the time dependence of metal availability to identify amendments that can sustainably reduce available pollutant concentrations over time. Drying-wetting cycles ...
Discrimination of beers by cyclic voltammetry using a single carbon screen-printed electrode
A fast, simple and costless methodology without sample pre-treatment is proposed for the discrimination of beers. It is based on cyclic voltammetry (CV) using commercial carbon screen-printed electrodes (SPCE) and includes ...
Paper spray-atmospheric pressure photoionization-high resolution mass spectrometry for the direct analysis of neutral fluorinated compounds in waterproof impregnation sprays
In this work, paper spray (PS) is combined with atmospheric pressure photoionization-mass spectrometry (PS-APPI-MS) for the determination of non-polar and low polar compounds, such as the neutral per- and polyfluorinated ...
Determination of acidity constants at 37 degrees C through the internal standard capillary electrophoresis (IS-CE) method: internal standards and application to polyprotic drugs
This work provides the pKa at the biorelevant temperature of 37 ºC for a set of compounds proposed as internal standards for the internal standard capillary electrophoresis (IS-CE) method. This is a high throughput method ...
