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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 PDFD-Histidine modulated chiral metal-organic frameworks for discriminating 3,4-Dihydroxyphenylalanine enantiomers based on a chemiluminescence quenching mode.
Anal Chim Acta
February 2025
Key Laboratory of Luminescence Analysis and Molecular Sensing (Ministry of Education), College of Pharmaceutical Sciences, Southwest University, Chongqing, 400715, China. Electronic address:
Background: Drug enantiomers often display distinguishable or even opposite pharmacological and toxicologic activities. Therefore it is of great necessity to discriminate enantiomers for guaranteeing safetyness and effectiveness of chiral drugs. Facile chiral discrimination has long been a noticeable challenge because of the minimal differences in physicochemical properties of enantiomers.
View Article and Find Full Text PDFEnantioselective construction of silicon-stereogenic vinylsilanes from simple alkenes.
Nat Commun
January 2025
State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Frontiers Science Center for New Organic Matter, Haihe Laboratory of Sustainable Chemical Transformations, Nankai University 94 Weijin Road, Tianjin, China.
The diverse utility of acyclic vinylsilanes has driven the interest in the synthesis of enantioenriched vinylsilanes bearing a Si-stereogenic center. However, the predominant approaches for catalytic asymmetric generation of Si-stereogenic vinylsilanes have mainly relied on transition metal-catalyzed reactions of alkynes with different silicon sources. Here we successfully realize the enantioselective synthesis of linear silicon-stereogenic vinylsilanes with good yields and enantiomeric ratios from simple alkenes under rhodium catalysis.
View Article and Find Full Text PDFThe continuing significance of chiral agrochemicals.
Pest Manag Sci
January 2025
Heinrich-Heine-University Düsseldorf, Institute of Organic Chemistry and Macromolecular Chemistry, Duesseldorf, Germany.
Chemical crop protection is one of the most cost-effective methods for agriculture, as crop failures can be prevented, and sustainable growth can be enabled regardless of the seasons. Agricultural production must be significantly increased in the future to meet the food needs of a growing world population. However, the continued loss of established active ingredients due to consumer perceptions, changing needs of farmers and ever-changing regulatory requirements is higher than annually new active ingredients introduced to the market.
View Article and Find Full Text PDFConformational changes in polysaccharide-based chiral selectors induced by mobile phase composition: Effects on enantioselective retention and enantiomer elution order reversal.
J Chromatogr A
February 2025
Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei 10608 Taiwan.
Despite having identical physicochemical properties, chiral molecules require effective separation techniques due to their distinct pharmacological effects. Polysaccharide-based chiral stationary phases (CSPs) are widely used for chiral separations in liquid chromatography; however, the mechanisms of chiral recognition are not well understood. This research explored the adsorption, retention, and chiral recognition mechanisms of three amylose-based CSPs: Chiralpak ID, IF, and IG.
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