Search results for "hplc"
showing 10 items of 201 documents
Presiones antropogénicas en el Parque Natural de L’Albufera: Contaminación debida a fármacos y productos para el cuidado personal
2021
La contaminación medio ambiental, debida a la actividad antrópica, ha crecido de forma exponencial en el último siglo. Por esta razón la tesis se ha centrado en una clase de contaminantes, fiel reflejo de esta presión, los fármacos y productos para el cuidado personal (PPCPs). El trabajo realizado incluye la optimización de métodos analíticos para detectar estos compuestos y la aplicación de estos a muestras medioambientales, para evaluar el estado de contaminación de una importante Reserva Natural. En primer lugar, se realizó una revisión bibliográfica que describe la importancia de cada paso en la preparación de la muestra para optimizar la determinación de estos contaminantes en ecosiste…
Contaminants of emerging concern in the environment. Turia River as study case
2018
Tesis llevada a cabo para conseguir el grado de Doctor por la Universidad de Valencia.--2018-04-05
Universal method to determine acidic licit and illicit drugs and personal care products in water by liquid chromatography quadrupole time-of-flight
2016
Graphical abstract
Stereoselective Synthesis and Pharmacological Evaluation of 2,4-Bridged Piperidine Derivatives Designed to Activate the κ-Opioid Receptor
2021
Chemical characterization of Anthemis parlatoreana fresh and dried aerial parts by GC and LC chromatographic techniques and evaluation of the antioxi…
2022
Anthemis parlatoreana was collected in the north west coast of Sicily. Fresh and dried aerial parts were subjected to distillation procedure for the extraction and isolation of essential oils. In both fresh and dried samples, the most abundant chemical classes were ketones and esters, represented to a greater extent by β-thujone and β-artemisia acetate, respectively. In dried vegetable material, a high content of α-pinene and δ3-carene was also registered. Aqueous, methanol and ethyl acetate extracts of aerial parts were also investigated in terms of polyphenolic content and antioxidant potential. All the extracts tested showed a quite different quali-quantitative profile and in terms of ch…
Acute responses of comprehensive gonadosteroids and corticosteroids to resistance exercise before and after 10 weeks of supervised strength training
2020
Resistance training is a potent stimulus for muscle growth and steroid hormones are known to play a role in this adaptation. However, very little is known about the acute exercise‐induced gonadosteroid and corticosteroid hormone responses, including key smaller‐concentration intermediate hormones. The present study determined the acute responses of these steroid hormone families using quantitative UHPLC mass spectrometry (MS) following resistance exercise in strength‐trained men. Venous and fingertip blood was drawn pre‐, mid‐, 5 min post‐ and 15 min post‐resistance exercise, both before and after 10 weeks of supervised resistance training. The experimental resistance exercise sessions cons…
Estudio de los valores de referencia para los parámetros de estrés oxidativo: malondialdehído y glutatión, medidos por cromatografía líquida de alta …
2015
La investigación en estrés oxidativo ha experimentado una expansión masiva en los últimos años. Multitud de datos indican que la producción de especies reactivas en los sistemas biológicos regulan numerosos procesos fisiológicos. La producción descontrolada de estas especies está implicada en el inicio y propagación de diversas patologías. Una aproximación común para la determinación del estrés oxidativo en los sistemas biológicos consiste en la medida del aumento o el descenso de moléculas redox-sensibles que responden a este tipo de estrés. Los biomarcadores de estrés oxidativo usualmente se clasifican en 4 categorías. La primera engloba la detección de oxidantes. Desafortunadamente, la m…
Identification of Abies sibirica L. Polyprenols and Characterisation of Polyprenol-Containing Liposomes
2020
The needles of conifer trees are one of the richest sources of natural polyprenols. Polyprenol homologs from Abies sibirica L. lipophilic 80% purified extract were analyzed and quantified. In total, 10 peaks (Prenol-11 to Prenol-20) were observed in the ultra-high-performance liquid chromatography&ndash
The effect of the pore structure and zeta potential of porous polymer monoliths on separation performance in ion-exchange mode.
2007
Most often, in bioseparations involving charged macromolecules, the chromatographic systems have low Reynolds and high Peclet numbers. For such systems, an expression is developed and presented in this work for evaluating the throughput in polymeric monoliths where ion-exchange adsorption occurs, as a function of (i) the pressure drop along the length of the monolith, (ii) the functional form and width of the throughpore-size distribution of the monolith, and (iii) the magnitude of the zeta potential on the surface of the throughpores of the monolith. Gaussian and log-normal throughpore-size distributions whose mean throughpore-size and standard deviation values are based on experimentally …
Chiral gamma-lactones from Fusarium poae: enentiomeric ratios and sensory differentiation of cis-6-gamma-dodecenolactone enantiomers
1991
Chiral gamma-lactones from Fusarium poae: enentiomeric ratios and sensory differentiation of cis-6-gamma-dodecenolactone enantiomers