Enginyeria Química i Química Analítica: Recent submissions
Now showing items 181-200 of 791
Evaluation of draw solutions and commercially available forward osmosis membrane modules for wastewater reclamation at pilot scale
An intensive evaluation of draw solutions (DS) was performed by focusing on the wastewater reuse applications of hybrid forward osmosis (FO) processes. The substances studied were potassium formate, potassium phosphate, ...
First application of carbon-based screen-printed electrodes for the voltammetric determination of the organic UV filters oxybenzone and octocrylene
A new voltammetric methodology is proposed for the simultaneous determination of the organic UV filters oxybenzone (benzophenone 3, BP3) and octocrylene (OC) in personal care products and in wastewater extracts.It is based ...
Exploring the stabilizing effect on the i-motif of neighboring structural motifs and drugs
Cytosine-rich DNA sequences may fold into a structure known as i-motif, with potential in vivo modulation of gene expression. The stability of the i-motif is residual at neutral pH values. To increase it, the addition of ...
Nucleic acid i-motif structures in analytical chemistry
Under the appropriate experimental conditions of pH and temperature, cytosine-rich segments in DNA or RNA sequences may produce a characteristic folded structure known as an i-motif. Besides its potential role in vivo, ...
Lecithin liposomes and microemulsions as new chromatographic phases
Lecithins are phospholipidic mixtures that can be part of microemulsions and liposomes. In this work, ready-to-use preparations of lecithin have been tested as pseudostationary and mobile phases in EKC and LC, respectively. ...
Pulsed amperometric detection: Extending the applicability of HPLC to substances with two-step redox processes.
Electrochemical detection coupled to liquid chromatography provides high selectivity compared to optical detection due to the lower number of electrochemically active compounds. Nevertheless, not all electrochemically ...
El método del caso aplicado a la enseñanza de la química
La Sociedad demanda de los profesionales de la QuÌmica unos requisitos que la Universidad ha de satisfacer a lo largo del proceso de formaciÛn. AsÌ, los futuros quÌmicos han de adquirir los conocimientos tÈcnicos, la ...
Study of seawater biofiltration by measuring adenosine triphosphate (ATP) and turbidity
In the present study, we examined seawater biofiltration in terms of adenosine triphosphate (ATP) and turbidity. A pilot biofilter continuously fed with fresh seawater reduced both turbidity and biological activity measured ...
Multiresidue determination of the penicillins regulated by the European Union in bovine, porcine and chicken muscle by LC-MS/MS
A multiresidue analysis method was developed to determine the content of penicillins in bovine, porcine and chicken muscle tissues. The procedure involves solid phase extraction (SPE) and subsequent analysis by liquid ...
Simultaneous determination of 210Pb and 90Sr and 210Po isolation in sludge samples using a plastic scintillation resin
This study describes a new and fast method for separating 210Po from 210Pb and 90Sr, before simultaneously measuring the individual activities of the latter two radionuclides using a plastic scintillation resin (PSresin) ...
Ionic equilibria in aqueous organic solvent mixtures. Speciation of hydrofluoric acid in several ethanol/water solutions
The presence of different species derived from hydrofluoric acid, together with the corresponding formationequilibria, has been investigated in 70% (w/w) ethanol/water solutions at analytical concentrations up to5molL−1. ...
Inorganic arsenic determination in food: a review of analytical proposals and quality assessment over the last six years
Here we review recent developments in analytical proposals for the assessment of inorganic arsenic (iAs) content in food products. Interest in the determination of iAs in products for human consumption such as food ...
Lipophilicity of amphoteric and zwitterionic compounds: a comparative study of determination methods
Common drugs intended for action in plasma (antibacterials, antiallergics, diuretics¿) often display both acidic and basic behavior, and some of these amphoteric compounds can appear as zwitterions. In such cases, accurate ...
Seguimiento continuo del proceso de gelificacion de alcoxidos de silicio y titanio mediante ensayos reologicos
En este trabajo se ha estudiado el proceso de gelificación desde un nuevo punto de vista: el seguimiento de la transición solgel mediante la evolución con el tiempo de la distribución de tiempos de relajación, que está ...
Atomistic simulations of the structure of highly crosslinked poly(styrene-co-divinylbenzene) ion exchange resins
The microscopic structures of highly crosslinked sulfonated poly(styrene-co-divinylbenzene) resins have been modeled by generating atomistic microstructures using stochastic-like algorithms, which are subsequently relaxed ...
Antimony in Polyethylene Terephthalate-Bottled Beverages: The Migration Puzzle
A novel strategy to assess the main variables that potentially affect the migration of antimony from PET bottles to beverages, including mineral waters and juices, is herein proposed. In a preliminary step, an LC-ICP-MS ...
Study on the removal of biodegradable NOM from seawater using biofiltration
Despite the low biodegradability of seawater NOM, problems associated with biofouling are common in facilities that handle seawater. In this work, a fixed-film aerobic biofilter is proposed as an effective unit for preventing ...
A chemometric survey about the ability of voltammetry to discriminate pharmaceutical products from the evolution of signals as a function of pH.
Many pharmaceutical products are electroactive and, therefore, can be determined by voltammetry. However, most of these substances produce signals in the same region of oxidative potentials, which makes it difficult to ...
NIR Monitoring and Modelling of Soybean Oil Methanolysis with Multivariate Curve Resolution-Alternating Least Squares with Correlation Constraint
Near infrared spectroscopy in-line monitoring and modelling of soybean oil methanolysis has been done using multivariate curve resolution alternating least squares (MCR-ALS) with correlation constraint. This constraint ...
FIA-ESI-MS Fingerprinting method with chemometrics for the characterization of adulterated coffee samples
Food products are very complex matrices, which makes the quality of these products an issue of great interest in our society. Considering the complexity of the food chain, the adulteration of food is increasing, causing ...
