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Two-Dimensional Liquid Chromatography-Isotope Ratio Mass Spectrometry Opens New Possibilities in the Field of Compound-Specific Stable Isotope Analysis.
Anal Chem
January 2025
Instrumental Analytical Chemistry, University of Duisburg-Essen, Universitätsstraße 5, 45141 Essen, Germany.
Compound-specific stable isotope analysis (CSIA) using liquid chromatography-isotope ratio mass spectrometry (LC-IRMS) is a powerful tool for determining the isotopic composition of carbon in analytes from complex mixtures. However, LC-IRMS methods are constrained to fully aqueous eluents. Previous efforts to overcome this limitation were unsuccessful, as the use of organic eluents in LC-IRMS was deemed impossible.
View Article and Find Full Text PDFUnlabelled: is a high-priority organism for the development of new antibacterial treatments. We found that the antimalarial medication mefloquine (MFQ) permeabilized the bacterial cell membrane of , decreased membrane fluidity, and caused physical injury to the membrane. MFQ also maintained activity across different pH conditions (PH range 5-8).
View Article and Find Full Text PDFOptimization of the extraction methods and evaluation of the hypoglycemic effect of extracts on artificially induced diabetic mice.
Heliyon
January 2025
Department of Chemical Engineering, Bangladesh University of Engineering and Technology, Dhaka, 1000, Bangladesh.
Synthetic antidiabetic drugs are often associated with various adverse side effects, including hypoglycemia, nausea, gastrointestinal disturbances, headaches, and even liver damage. In contrast, plant-derived natural antidiabetic bioactive compounds typically exhibit lower toxicity and fewer side effects and have been reported to aid effectively in diabetes management. These plant extracts regulate diabetes by restoring pancreatic function, enhancing insulin secretion, inhibiting intestinal glucose absorption, and facilitating insulin dependent metabolism.
View Article and Find Full Text PDFMonitoring the Fate of Zn in the Cu/ZnO/ZrO2 Catalyst during CO2-to-Methanol Synthesis at High Conversions by Operando Spectroscopy.
Angew Chem Int Ed Engl
January 2025
Karlsruhe Institute of Technology KIT, Institute for Chemical Technology and Polymer Chemistry, Kaiserstr. 12, Fakultät für Chemie, 76131, Karlsruhe, GERMANY.
In the frame of developing a sustainable chemical industry, heterogeneously catalyzed CO2 hydrogenation to methanol has attracted considerable interest. However, the Cu-Zn based catalyst system employed in this process is very dynamic, especially in the presence of the products methanol and water. Deactivation needs to be prevented, but its origin and mechanism are hardly investigated at high conversion where product condensation is possible.
View Article and Find Full Text PDFA non-derivatized high-performance liquid chromatography method for simultaneous quantification of hydroxyl acids and amino acids in ammonolysis reactions.
Anal Methods
January 2025
School of Food and Bioengineering, Changsha University of Science & Technology, Changsha, Hunan, 4100114, China.
A non-derivatized high-performance liquid chromatographic (HPLC) method was developed for the simultaneous quantification of hydroxyl acids and their amination products in ammonolysis reaction mixtures. By optimizing the mobile phase composition and pH (0.04 M KHPO-5% methanol, pH = 2.
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