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On the Influence of Additives and Modifiers on the Chiral HPLC Separation of the Enantiomers of Nicotine.
Chirality
February 2025
Daicel Chiral Technologies, West Chester, Pennsylvania, USA.
The influence of additives and modifiers on the chiral HPLC separation of the nicotine enantiomers using UV/Vis detection is discussed. Selected alcohols as modifiers and selected amines as additives were found to have a significant effect on the resolution and retention times of nicotine enantiomers even to the point of eliminating component elution. Systematic variations in the concentration of ethanol, methanol, and isopropanol, as modifiers, along with variations in the concentration of diethylamine, triethylamine, tributylamine, ethylenediamine, isopropylamine, as additives, revealed that the average resolution (R) of the nicotine enantiomers ranged from 2.
View Article and Find Full Text PDFImpact of Caffeine Intake on Female Basketball Players' Performance.
Nutrients
January 2025
Performance and Sport Rehabilitation Laboratory, University of Castilla La Mancha, 45071 Toledo, Spain.
Background: This study aimed to analyze the effect of caffeine ingestion on basketball performance in semi-professional female players.
Methods: A double-blind, placebo-controlled, randomized experimental design was conducted, in two different periods separated by a week. Twelve female basketball players ingested 3 mg of caffeine/kg of body mass or a placebo.
Screening of Solvent Systems for Countercurrent Chromatography Separation of Polar Constituents from L. Seeds.
Molecules
January 2025
College of Chemistry & Pharmacy, Northwest A&F University, 22 Xiong Road, Yangling 712100, China.
The separation of large polar constituents presents a substantial challenge in natural product research when employing column chromatography techniques, as the process is both complex and time-consuming. In this study, an acetonitrile/tetrahydrofuran/di-(2-ethylhexyl) phosphoric acid/aqueous saturated sodium chloride solvent system was developed and utilized for the countercurrent chromatography of polar constituents from L. seeds.
View Article and Find Full Text PDFDiastereodivergent Construction of Octahydrophenanthridinone and Octahydrophenanthridine Cores.
Molecules
January 2025
Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi 770-8505, Tokushima, Japan.
Diastereodivergent synthesis of octahydrophenanthridinone and octahydrophenanthridine skeletons, structural motifs often found in biologically active natural products, is described. We previously reported a total synthesis of a pancratistatin analog using novel octahydrophenanthridinone construction. In this study, we examined the generality of our method and its extension to octahydrophenanthridine formation.
View Article and Find Full Text PDFSecondary Metabolites from the Mangrove Ecosystem-Derived Fungi spp.: Chemical Diversity and Biological Activity.
Mar Drugs
December 2024
Key Laboratory of Tropical Medicinal Resource Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, China.
Mangrove ecosystems have attracted widespread attention because of their high salinity, muddy or sandy soil, and low pH, as well as being partly anoxic and periodically soaked by tides. Mangrove plants, soil, or sediment-derived fungi, especially the species, possess unique metabolic pathways to produce secondary metabolites with novel structures and potent biological activities. This paper reviews the structural diversity and biological activity of secondary metabolites isolated from mangrove ecosystem-derived species over the past 5 years (January 2020-October 2024), and 417 natural products (including 170 new compounds, among which 32 new compounds were separated under the guidance of molecular networking and the OSMAC approach) are described.
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