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Pyridine Derivatives and Furan Derivatives Identified from the Medicinal Mushroom Irpex lacteus SY1002.
Chem Biodivers
January 2025
Qingdao Agricultural University, School of Life Sciences, Qingdao, CHINA.
Three new pyridine derivatives, irpelactedines A-C (1-3), and a new furan derivative, irpelactedine D (5), along with two structurally related known compounds, irpexidine A (4) and 5-carboxy-2-furanpropanoic acid (6), were isolated from the medicinal fungus Irpex lacteus SY1002. Their structures were elucidated through NMR and mass spectral analyses, combined with density functional theory calculations of ECD data. Evaluation of angiotensin-converting enzyme (ACE) inhibitory activity revealed that compounds 1 and 3 displayed moderate inhibition, with IC50 values of 31.
View Article and Find Full Text PDFApproaches for the preparation and evaluation of hydrophilic polyethylene and polyethylene terephthalate microplastic particles suited for toxicological effect studies.
Anal Bioanal Chem
January 2025
European Commission, Joint Research Centre (JRC), Geel, Belgium.
When performing effect studies to investigate the impact of microplastic (MP) on cell lines, algae, or daphnia, it is advantageous if such experiments can be performed without the use of surfactants. The need for surfactants arises from the fact that finely milled pristine MP particles generally are hydrophobic. Methods for the preparation of larger amounts of hydrophilic and hence artificially aged MP particles and approaches for their characterization are of high importance.
View Article and Find Full Text PDFImproving Sensitivity and Resolution of Dendrimer Identification in MALDI-TOF Mass Spectrometry Using Varied Matrix Combinations.
Polymers (Basel)
January 2025
Departamento de Ciencias Preclínicas, Facultad de Medicina, Universidad de La Frontera, Temuco 4811230, Chile.
Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) is a well-known technique for polymer analysis, particularly for determining the molecular weight and structural details of dendrimers. In this study, we evaluated the performance of various matrices, such as 2',4',6'-trihydroxyacetophenone (THAP), α-cyano-4-hydroxycinnamic acid (HCCA), and sinapinic acid (SA), and their combinations, on the sensitivity and resolution of poly(amidoamine) (PAMAM) dendrimers of different generations (G3.0, G4.
View Article and Find Full Text PDFEnvironmental Applications of Mass Spectrometry for Emerging Contaminants.
Molecules
January 2025
Department of Bioproducts and Biosystems Engineering, University of Minnesota, St. Paul, MN 55108, USA.
Emerging contaminants (ECs), encompassing pharmaceuticals, personal care products, pesticides, and industrial chemicals, represent a growing threat to ecosystems and human health due to their persistence, bioaccumulation potential, and often-unknown toxicological profiles. Addressing these challenges necessitates advanced analytical tools capable of detecting and quantifying trace levels of ECs in complex environmental matrices. This review highlights the pivotal role of mass spectrometry (MS) in monitoring ECs, emphasizing its high sensitivity, specificity, and versatility across various techniques such as Gas Chromatography-Mass Spectrometry (GC-MS), Liquid Chromatography-Mass Spectrometry (LC-MS), and High-Resolution Mass Spectrometry (HR-MS).
View Article and Find Full Text PDFNew Oxygenated Methoxy--Cymene Derivatives from Leopard's Bane ( Ten., Asteraceae) Essential Oil: Synthesis Facilitating the Identification of Isomeric Minor Constituents in Complex Matrices.
Molecules
January 2025
Department of Chemistry, Faculty of Sciences and Mathematics, University of Niš, Višegradska 33, 18000 Niš, Serbia.
Species of the genus are known for their pharmacological properties and essential oils, the chemical composition of which remains inadequately studied. In this work, GC-MS analysis, synthesis, and spectral techniques (UV, IR, MS, and NMR) were employed to identify 83 constituents in the essential oil from roots, which accounted for 98.1% of the total GC-peak area.
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