A novel analytical platform based on liquid chromatography and tandem mass spectrometry using atmospheric pressure photoionization was applied for the simultaneous quantification of free and esterified beta-sitosterol, campesterol, brassicasterol, and stigmasterol. The total time for sample pretreatment and analysis could be reduced from approximately 3 h [gas chromatography-mass spectrometry (GC-MS)] to 15 min. The detection limits of the different phytosterols ranged between 0.25 and 0.68 microg/l. Linear ranges were between 1 and 1,000 microg/l. The within-run and between-run variabilities ranged between 1.4% and 9.9%. The analytical sensitivity was at least 150-fold higher compared with GC-MS. Our new method allows a rapid and simultaneous determination of free and esterified phytosterols in serum.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1194/jlr.C400004-JLR200 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Following a request from the European Commission, the EFSA Panel on Nutrition, Novel Foods and Food Allergens (NDA) was asked to provide an opinion on the safety of a change of the specifications of the authorised NF 'phytosterols/phytostanols' as a novel food (NF) pursuant to Regulation (EU) 2015/2283. This authorised NF concerns phytosterols extracted from plants and which may be presented as free sterols and stanols or esterified with food grade fatty acids. It has to contain less than 81% β-sitosterol, less than 35% β-sitostanol, less than 40% campesterol, less than 15% campestanol, less than 30% stigmasterol and less than 3% brassicasterol.
View Article and Find Full Text PDFPolysorbates degrading enzymes in biotherapeutics - a current status and future perspectives.
Front Bioeng Biotechnol
January 2025
Pharmaceutical Development Biologicals, TIP, Boehringer Ingelheim Pharma GmbH & Co., KG, Innovation Unit, Biberach an der Riss, Germany.
Polysorbates, in particular polysorbate (PS) 20 and 80, are the most commonly used surfactants for stabilising biotherapeutics produced by biotechnological processes. PSs are derived from ethoxylated sorbitan (a derivative of sorbitol) esterified with fatty acids of varying chain length and degree of saturation. In the past, these surfactants have been reported to have specific liabilities.
View Article and Find Full Text PDFImpact of Citric Acid on the Structure, Barrier, and Tensile Properties of Esterified/Cross-Linked Potato Peel-Based Films and Coatings.
Polymers (Basel)
December 2024
Meat Technology & Science of Protein-Rich Foods (MTSP), Department of Microbial and Molecular Systems, Leuven Food Science and Nutrition Research Centre, KU Leuven Campus Ghent, B-9000 Ghent, Belgium.
The valorization of potato peel side streams for food packaging applications, especially for the substitution of current petrochemical-based oxygen barrier solutions such as EVOH, is becoming increasingly important. Therefore, potato peel-based films and coatings (on PLA) were developed containing 10-50% (/ potato peel) citric acid (CA). To determine the impact of CA concentration on the structure and physicochemical properties of cast films and coatings, ATR-FTIR spectroscopy, moisture adsorption isotherms, tensile properties, light transmittance, oxygen permeability, carbon dioxide transmission rate, and water vapor transmission rate measurements were performed.
View Article and Find Full Text PDFPhenolic Fractions from Walnut Milk Residue: Antioxidant Activity and Cytotoxic Potential.
Plants (Basel)
December 2024
Institute of Nutrition and Food Technology, University of Chile, El Líbano 5524, Macul, Santiago 7830490, Chile.
Walnut milk residues (WMR) were investigated for the first time through their phenolic characterization including soluble (free, esterified, and etherified) phenolics and those released from their insoluble-bound form (insoluble-bound phenolic hydrolysates, IBPHs) and their antioxidant properties. Free phenolics were recovered and alkaline or acid hydrolysis were used to recover the remaining phenolic fractions. Total phenolic compounds (TPCs) and their antioxidant activity were analyzed by Folin-Ciocalteu, FRAP, and ORAC methods, respectively.
View Article and Find Full Text PDFFirst Insights into the Formation of Metal Soaps in Alkyd-Based Paints: A Proof-of-Concept Investigation Using FTIR Spectroscopy.
Molecules
December 2024
Centro per la Conservazione ed il Restauro dei Beni Culturali "La Venaria Reale", Via XX Settembre 18, 10078 Venaria Reale, Turin, Italy.
The formation of metal soaps or carboxylates in oil paintings is a widely studied topic. Expanding upon the extant research on the subject, this work investigates the formation of metal soaps as pertaining to alkyd-based media. Especially popular in modern and contemporary art, alkyd paints are complex commercial formulations mainly containing a polyester backbone obtained by the condensation of glycerol and phthalic acids, where the third free alcoholic function is esterified with a blend of saturated and unsaturated fatty acids.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!