Enginyeria Química i Química Analítica: Recent submissions
Now showing items 381-400 of 791
Proteómica shotgun para la caracterización integral de granos de quinoa: una herramienta prometedora en el campo de la inmunonutrición
Este artículo presenta una estrategia proteómica basada en la utilización de la cromatografía de líquidos acoplada a la espectrometría de masas en tándem (LC-MS/MS), en combinación con el entorno de trabajo, para caracterizar ...
LINEAR UNMIXING PROTOCOL FOR HYPERSPECTRAL IMAGE FUSION ANALYSIS APPLIED TO A CASE STUDY OF VEGETAL TISSUES
Hyperspectral imaging (HSI) is a useful non-invasive technique that offers spatial and chemical information of samples. Often, different HSI techniques are used to obtain complementary information from the sample by combining ...
Authentication of Cocoa Products Based on Profiling and Fingerprinting Approaches: Assessment of Geographical, Varietal, Agricultural and Processing Features
Cocoa and its derivative products, especially chocolate, are highly appreciated by consumers for their exceptional organoleptic qualities, thus being often considered delicacies. They are also regarded as superfoods due ...
Reverse osmosis concentrate treatment by chemical oxidation and moving bed biofilm processes
In the present work, four oxidation techniques were investigated (O3, O3/UV, H2O2/O3, O3/H2O2/UV) to pre-treat reverse osmosis (RO) concentrate before treatment in a moving-bed biofilm reactor (MBBR) system. Without previous ...
Field-Amplified Sample Injection-Micellar Electrokinetic Chromatography for the Determination of Benzophenones in Food Simulants
A field-amplified sample injection-micellar electrokinetic chromatography (FASI-MEKC) method for the determination of 14 benzophenones (BPs) in a food simulant used in migration studies of food packaging materials was ...
Assessment of experimental factors affecting the sensitivity and selectivity of the spectrophotometric estimation of proanthocyanidins in foods and nutraceuticals
The assessment of a reliable method for the determination of active proanthocyanidins (PACs) in functional foods, nutraceuticals, and foodstuffs is still a pending analytical challenge. In general, pharmaceutical and food ...
Generic skills development and learning/assessment proces: Use of rubrics and students validation
In order to fulfill the European Higher Educaton Area requirements in the subject 'Chemical Engineering Experimentaton II' (Chemical Engineering Undergraduate Degree, University of Barcelona), generic skills in teamwork, ...
Comparison of the retention of basic compounds in anionic and cationic microemulsion electrokinetic chromatographic systems
Retention of ionizable bases in microemulsion electrokinetic chromatography (MEEKC) has been studied using two different systems with anionic and cationic microemulsions. Microemulsion pseudostationary phase is composed ...
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 ...
Determination of trace levels of nickel(II) by adsorptive stripping voltammetry using a disposable and low-cost carbon screen-printed electrode
A commercial and disposable screen-printed carbon electrode (SPCE) has been proposed for a fast, simple and low-cost determination of Ni(II) at very low concentration levels by differential pulse adsorptive stripping ...
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 ...
Characterization of the polyphenolic profile in tomato (Lycopersicon esculentum P. Mill) peel and seeds by LC-HRMS/MS
Peel and seeds are the main byproducts from tomato (Lycopersicon esculentum P. Mill) processing with high concentrations of polyphenols that have been underexploited. Herein, polyphenolic profiles in tomato peel and seeds ...
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 ...
Recent advances in the determination of biogenic amines in food samples by (U)HPLC
The determination of biogenic amines (BAs) in food products stirs up an increasing interest because of the implications in toxicological and food quality issues. Apart from these aspects, in the last years, the relevance ...
Authentication of paprika using HPLC-UV fingerprints
In this work we combine simple extraction and HPLC-UV methodologies with chemometric pattern-recognition strategies in order to obtain characteristic fingerprints of phenolic compounds that allow the authentication of ...
The Effect of Small Cosolutes that Mimic Molecular Crowding Conditions on the Stability of Triplexes Involving Duplex DNA
Triplex stability is studied in crowding conditions using small cosolutes (ethanol, acetonitrile and dimethylsulfoxide) by ultraviolet (UV), circular dichroism (CD) and nuclear magnetic resonance (NMR) spectroscopies. The ...
A simple model to describe the thixotropic behavior of paints.
We propose a simple rheological model to describe the thixotropic behavior of paints, since the classical hysteresis area, which is usually used, is not enough to evaluate thixotropy. The model is based on the assumption ...
Optimization of experimental conditions for skin-PAMPA measurements
In recent years, the parallel artificial membrane permeability assay (PAMPA) has been extended for prediction of skin permeation by developing an artificial membrane which mimics the stratum corneum structure, skin-PAMPA. ...
Preconcentración por extracción en fase sólida en línea a la electroforesis capilar acoplada a la espectrometría de masas
Los factores más importantes a tener en cuenta cuando se desarrollan nuevas técnicas y métodos de separación son la simplificación, rapidez y coste de los análisis, la reducción de la cantidad de reactivos y muestra ...
Ammoniacal nitrogen recovery from swine slurry using a gas-permeable membrane: pH control strategies and feed-to-trapping volume ratio
Gas-permeable membrane (GPM) technology is gaining interest to recover nitrogen from residual effluents due to its effectiveness, simple operation and capacity of producing a nutrient rich product with fertilising value. ...
