Enginyeria Química i Química Analítica: Enviaments recents
Ara mostrant els elements 221-240 de 790
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 ...
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. ...
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 ...
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 ...
Uncovering the therapeutic potential of green pea waste in breast cancer: A multi-target approach utilizing LC-MS/MS metabolomics, molecular networking, and network pharmacology
Background Pisum sativum (PS) is a universal legume plant utilized for both human and animal consumption, particularly its seeds, known as green peas. The processing of PS in food industries and households produces a ...
Relevant properties for catalytic activity of sulfonic ion-exchange resins in etherification of isobutene with linear primary alcohols
The catalyzed liquid-phase reaction of isobutene with a homologous series of linear alcohols, from methanol to 1-butanol, has been studied at 333 K and 1.5 MPa. Sixteen sulfonic ion-exchange resins, to cover a wide range ...
Tuning G-quadruplex nanostructures with lipids. Towards designing hybrid scaffolds for oligonucleotide delivery
Two G-quadruplex forming oligonucleotides [d(TG4T)4 and d(TG6T)4] were selected as two tetramolecular quadruplex nanostructures because of their demonstrated ability to be modified with hydrophobic molecules. This allowed ...
Long-term evaluation of a forward osmosis-nanofiltration demonstration plant for wastewater reuse in agriculture
Hybrid forward osmosis (FO) processes such as forward osmosis with membrane bioreactors (FO-MBR), electrodialysis (FO-ED), nanofiltration (FO-NF) or reverse osmosis (FO-RO) present promising technologies for wastewater ...
Reactions of bisphenol F and bisphenol S with ozone and hydroxyl radical: Kinetics and mechanisms
Bisphenol F (BPF) and bisphenol S (BPS) are the most employed substitutes of bisphenol A (BPA), after being restricted by legislation in different countries because of its endocrine disrupting behaviour. In the present ...
Role of sunlight and oxygen on the performance of photo-Fenton process at near neutral pH using organic fertilizers as iron chelates
Nowadays, reaction mechanisms of photo-Fenton process with chelated iron are not yet clearly defined. In this study, five organic fertilizers were used as iron complexes to investigate the role of sunlight and oxygen in ...
Study of light-induced formation of photodimers in the i-motif nucleic acid structure by rapid-scan FTIR difference spectroscopy and hybrid hard- and soft-modelling
The i-motif is a DNA structure formed by cytosine-rich sequences, very relevant from a biochemical point of view and potentially useful in Nanotechnology as pH-sensitive nanodevices or nanomotors. To provide a different ...
Influence of chemical speciation on the separation of metal ions from chelating agents by nanofiltration membranes
The simultaneous separation of various metal ions (nickel, copper, calcium, and iron) from chelating agents (EDTA and citric acid) in water streams using Nanofiltration membranes is analyzed. Assuming that multiply-charged ...
Química alimentària: ciència versus cultura
El dia 15 de novembre de 2011, a la fira Expoquimia se celebrà una jornada científica amb el títol «Química alimentària: ciència versus cultura» organitzada per l'Associació Catalana de Ciències de l'Alimentació, amb la ...
Direct solid sample analysis with graphite furnace atomic absorption spectrometry -A fast and reliable screening procedure for the determination of inorganic arsenic in fish and seafood
Direct solid sample analysis with graphite furnace atomic absorption spectrometry (SS-GF AAS) was investigated initially with the intention of developing a method for the determination of total As in fish and other seafood. ...
Characterization of turmeric and curry samples by liquid chromatography with spectroscopic detection based on polyphenolic and curcuminoid contents
This paper deals with the characterization of turmeric and related products using the compositional fingerprints of curcuminoids (e.g. curcumin, demethoxycurcumin and bisdemethoxycurcumin) and other phenolic compounds (e.g. ...
Didàctica: Una aportació en la docència de la química a la frontera secundària-universitat: les jornades 'Fem química al laboraori' a la Facultat de Química de la Universitat de Barcelona
[cat] L'any 2002 un grup de professors de la Facultat de Química de la Universitat de Barcelona va posar en marxa «Fem química al laboratori», una nova activitat docent, amb l'objectiu de contribuir a la formació dels ...
Aggregation induced nucleic acids recognition by homodimeric asymmetric monomethyne cyanine fluorochromes in mesenchymal stem cells
In the light of recent retrovirus pandemics, the issue of discovering new and diverse RNA-specific fluorochromes for research and diagnostics became of acute importance. The great majority of nucleic acid-specific probes ...
Kernelizing: A way to increase accuracy in trilinear decomposition analysis of multiexponential signals
The unmixing of multiexponential decay signals into monoexponential components using soft modelling approaches is a challenging task due to the strong correlation and complete window overlap of the profiles. To solve this ...
Process performance and precipitate quality of phosphorus recovery by struvite precipitation in a fluidized bed reactor using a MgO industrial by-product
Phosphorus recovery through struvite precipitation has gained interest due to the potential use of struvite as a fertiliser, with fluidised bed reactors being a popular technology for carrying out the process. Struvite ...
Determination of phenolic compounds in paprika by ultrahigh performance liquid chromatography-tandem mass spectrometry: application to product designation of origin authentication by chemometrics
A UHPLC-ESI-MS/MS method was developed for the determination of 36 phenolic compounds in paprika. The proposed method showed good method performance with limits of quantitation between 0.03 - 50 µg/L for 16 compounds, and ...
