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Drug Development.
Alzheimers Dement
December 2024
University of the Balearic Islands, Palma de Mallorca, Spain.
Background: Reactive astrocytes and neuron death by excitotoxicity are observed in Alzheimer's disease (AD). DHA-H (2-hydroxy-docosahexaenoic acid; 2-OH-C22:6 n-3) is a molecule under development that has demonstrated therapeutic efficacy in both cellular and 5xFAD mouse model of AD. DHA-H is metabolized through α-oxidation to yield HPA (Heneicosapentaenoic acid; C21:5 n-3).
View Article and Find Full Text PDFSynthesis of α,β-Unsaturated Carbonyl Compounds via Cu/TEMPO/O2 Aerobic Catalytic System.
Chemistry
January 2025
Shihezi University, School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, North 4th Road, 832003, Shihezi, CHINA.
An N,N,N-type Cu(Ⅱ) complex-catalyzed desaturation method for converting alcohols, ketones, lactones, and lactams to their α,β-unsaturated carbonyl compounds is reported. The dehydrogenation reaction can be conducted with a green terminal oxidant O2 without requiring strong acid/base or stoichiometric oxidants. The Cu(Ⅱ) complex/TEMPO/O2 system uses a non-noble catalyst, and a green terminal oxidant as well as demonstrates high activity and functional group tolerance.
View Article and Find Full Text PDFStrong emissions and aerosol formation potential of higher alkanes from diesel vehicles.
J Hazard Mater
December 2024
College of Environment and Climate, Institute for Environmental and Climate Research, Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Jinan University, 51143, China.
Higher alkanes are a major class of intermediate volatile organic compounds (IVOCs) emitted by vehicles, which have been considered as important precursors of secondary organic aerosol (SOA) in urban area. Dynamometer experiments were conducted to characterize emissions from gasoline and diesel vehicles in China. Three types of higher alkanes, namely acyclic, cyclic, and bicyclic alkanes, were explicitly quantified through the novel proton transfer reaction time-of-flight mass spectrometer with NO ionization (NO PTR-ToF-MS) with time response of 1 second.
View Article and Find Full Text PDFValidation of a liquid chromatography-high-resolution mass spectrometry method to quantify peptide-related impurities in teriparatide.
J Pharm Biomed Anal
December 2024
Office of Pharmaceutical Quality Research, Office of Pharmaceutical Quality, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, St. Louis, MO 63110, USA.
With recent advances in quantitative high-resolution mass spectrometry (HRMS), there is growing interest in developing liquid chromatography (LC)-HRMS methods that can simultaneously quantify numerous critical impurities in a peptide or protein drug. This approach is attractive as it could reduce the total number of methods and instruments required during product development and quality control testing, while taking advantage of the technique's high specificity and sensitivity. To investigate the feasibility of this approach for peptide drugs, an LC-HRMS method was validated for the quantification of six peptide-related impurities in teriparatide, the 34-amino acid active ingredient in Forteo.
View Article and Find Full Text PDFAntibiotic legacies shape the temperature response of soil microbial communities.
Front Microbiol
December 2024
Department of Soil and Water Systems, University of Idaho, Moscow, ID, United States.
Soil microbial communities are vulnerable to anthropogenic disturbances such as climate change and land management decisions, thus altering microbially-mediated ecosystem functions. Increasingly, multiple stressors are considered in investigations of ecological response to disturbances. Typically, these investigations involve concurrent stressors.
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