A5091508927- Phytochemicals and Antioxidant Activities
- Fermentation and Sensory Analysis
- Analytical Chemistry and Chromatography
- Essential Oils and Antimicrobial Activity
- Plant biochemistry and biosynthesis
- Horticultural and Viticultural Research
- Pesticide Residue Analysis and Safety
- Natural product bioactivities and synthesis
- Analytical Methods in Pharmaceuticals
- Phytochemistry and Biological Activities
- Spectroscopy and Chemometric Analyses
- Advanced Chemical Sensor Technologies
- Traditional and Medicinal Uses of Annonaceae
- Edible Oils Quality and Analysis
- Alkaloids: synthesis and pharmacology
- Insect and Pesticide Research
- Toxic Organic Pollutants Impact
- Analytical chemistry methods development
- Postharvest Quality and Shelf Life Management
- Biochemical Analysis and Sensing Techniques
- Antioxidant Activity and Oxidative Stress
- Mass Spectrometry Techniques and Applications
- Piperaceae Chemical and Biological Studies
- Antibiotics Pharmacokinetics and Efficacy
- Meat and Animal Product Quality
University of the Basque Country
2014-2023
Universidade de Santiago de Compostela
2004
Six flavone mono-C-glucosides, four standards (beta-D-glucopyranosyl-(1 --> C-6)- and -(1 C-8)- apigenin luteolin) two others from lemon juice C-8)-diosmetin) have been studied in order to analyze their fragmentation patterns. Initial separation was carried out using high-performance liquid chromatography with diode-array detection (HPLC/DAD) coupled an electrospray ionization (ESI) interface a triple quadrupole mass spectrometer. Several systematic differences between collision-induced...
The polyphenolic compositions of 31 Basque cider apple cultivars were determined in pulp, peel, and juice by high-performance liquid chromatography with diode array detection analysis crude extracts after thiolysis. Total polyphenols are distributed a wide concentration range depending on the cultivar. Procyanidins class that present major concentrations apple. Their average degrees polymerization from 4 to 8 Apple technologically classified into bitter nonbitter categories using different...
Abstract Liquid chromatography coupled with a photodiode array detector, electrospray ionization, collision‐induced dissociation and tandem mass spectrometry (LC‐DAD/ESI‐CID‐MS/MS) on triple quadrupole (QqQ) has been used to detect characterize polyphenols methylxanthines in green coffee beans: three phenolic acids (caffeic acid, ferulic acid dimethoxycinnamic acid), isomeric caffeoylquinic (M r 354), feruloylquinic 368), one p‐ coumaroylquinic 338), dicaffeoylquinic 516),...
A study on the possible degradation of amitraz, bromopropylate, coumaphos, chlordimeform, cymiazole, flumethrin, and tau-fluvalinate during storage honey was carried out by HPLC. Except other acaricides are stable in this medium for at least 9 months. Degradation studies amitraz beeswax were out; products detected both matrices 2,4-dimethylphenylformamide (DMF) N-(2,4-dimethylphenyl)-N'-methylformamidine (DPMF). The reaction rate constants half-lives wax calculated. Amitraz nearly completely...
The data set composed by phenolic compound profiles of 83 Citrus juices (determined HPLC-DAD-MS/MS) was evaluated chemometrics to differentiate them according species (sweet orange, tangerine, lemon, and grapefruit). Cluster analysis (CA) principal component (PCA) showed natural sample grouping among even the subclass. Most information contained in full can be captured if only 15 compounds (concentration ≥10 mg/L), which quantified with fast accurate methods real samples, are introduced...
Polyphenols in the peel and pulp of 15 Basque cider apple varieties were determined by accelerated solvent extraction followed reversed phase high-performance liquid chromatography with diode array detection. It was observed that polyphenolic composition depended on varieties, whereas main classes phenolic compounds flavan-3-ols hydroxycinnamic acids all cases, representing both together between 86 95% total polyphenols assayed. Keywords: Cider apple; natural products; polyphenols;...
A mass spectrometric method using electrospray ionization with triple quadrupole and time-of-flight hybrid (Q-Tof) spectrometry has been applied to the structural characterization of dihydroflavonols. This family compounds studied by liquid chromatography/tandem (LC/MS/MS) for first time in this work. comprehensive study product ion MS spectra [M+H](+) a commercially available standard performed. The most useful fragmentations terms identification are those that involve cleavage C-ring,...
Lettuce (Lactuca sativa) is one of the most popular leafy vegetables in world and constitutes a major dietary source phenolic compounds with health-promoting properties. In particular, demand for green red oak-leaf lettuces has considerably increased last years but few data on their polyphenol composition are available. Moreover, usage analytical edge technology can provide new structural information allow identification unknown polyphenols. present study, profiles lettuce cultivars were...