Results 11 to 20 of about 511,953 (205)

Effect of 50% enantiomeric excess bupivacaine mixture combined with pancuronium on neuromuscular transmission in rat phrenic nerve-diaphragm preparation; a pilot study [PDF]

Indian Journal of Anaesthesia, 2015
Background and Aims: Local anaesthetics are drugs that are widely used in clinical practice. However, the effects of these drugs on the neuromuscular junction and their influence on the blockade produced by non-depolarising neuromuscular blocking drugs ...
Angelica de Fátima de Assunção Braga, Vanessa Henriques Carvalho, Franklin Sarmento da Silva Braga, Gloria Maria Braga Potério, Filipe Nadir Caparica Santos, Fernando Eduardo Féres Junqueira   +5 more
doaj   +2 more sources

Importance of Molecular Symmetry for Enantiomeric Excess Recognition by NMR [PDF]

, 2022
Recently prochiral solvating agents (pro-CSA) became a spotlight for the detection of enantiopurity by NMR. Chemical shift non-equivalency in achiral hosts introduced by the presence of chiral guest yields observable resonance signal splitting ...
Brendan, Twamley, John E., O\u27Brien, Irina, Osadchuk, Mathias O., Senge, Karolis, Norvaisa, Victor, Borovkov   +5 more
core   +1 more source

Enantiomeric Excess Dependent Splitting of NMR Signal Through Co-Ligand Dynamic Exchange in a Coordination Complex [PDF]

, 2020
A coordination complex (L·2Zn·3C), where L is a prochiral ligand and C is an exchangeable acetate co-ligand, exhibits symmetrical splitting of 1H-NMR resonances due to L, which is proportional to the enantiomeric excess (ee) of a chiral guest co-ligand ...
Hisako, Sato, Václav, Březina, Shinsuke, Ishihara, Jonathan P., Hill, Shigeki, Mori, Jan, Labuta, Kazuyoshi, Takimoto, Masato, Sumita, Daniel, Payne, Katsuhiko, Ariga   +9 more
core   +1 more source

Organocatalytic Properties of 3,4-Dihydroxyprolines

Chemistry Proceedings, 2023
The synthesis and organocatalytic properties of (2S,3R,4R)-3,4-bis((tert-butyldimethylsilyl)oxy)pyrrolidine-2-carboxylic acid are reported. Using the aldol condensation of cyclohexanone with p-nitrobenzaldehyde as a model, a yield of 86%, an enantiomeric
Ramón J. Estévez, Rosalino Balo, Andrés Fernández, Juan C. Estévez   +3 more
doaj   +1 more source

Natural Variability in Enantiomeric Composition of Bioactive Chiral Terpenoids in the Essential Oil of L. from Uttarakhand, India

Natural Product Communications, 2008
The natural variability in the enantiomeric distribution of biologically active chiral terpenoids in Solidago canadensis L. essential oil from Kumaon was evaluated by enantioselective capillary GC, capillary GC, and GC-MS.
Chandan S. Chanotiya, Anju Yadav
doaj   +1 more source

Corylus avellana L. Natural Signature: Chiral Recognition of Selected Informative Components in the Volatilome of High-Quality Hazelnuts

Frontiers in Plant Science, 2022
The volatile fraction of plant-based foods provides useful functional information concerning sample-related variables such as plant genotype and phenotype expression, pedoclimatic and harvest conditions, transformation/processing technologies, and can be
Federico Stilo, Federico Stilo, Marta Cialiè Rosso, Simone Squara, Carlo Bicchi, Chiara Cordero, Cecilia Cagliero   +6 more
doaj   +1 more source

Enantiomeric Composition of (3)-(-)- and (3)-(+)-Linalool in Various Essential Oils of Indian Origin by Enantioselective Capillary Gas Chromatography-Flame Ionization and Mass Spectrometry Detection Methods

Natural Product Communications, 2009
Enantiomeric ratios of linalool have been determined in various authentic essential oils of Indian origin using 10% heptakis(2,3-di- O -methyl-6- O -tert-butyldimethylsilyl)-β-cyclodextrin as a chiral stationary phase. A complete enantiomeric excess (ee)
Chandan S. Chanotiya, Anju Yadav
doaj   +1 more source

Determination of the enantiomeric purity of mevalonolactone via NMR using a chiral lanthanide shift reagent.

Journal of Lipid Research, 1982
Simple methods for determining the enantiomeric purity of mevalonolactone and linalool by NMR using the chiral shift reagent Eu(hfc)3 are reported. These methods are more reliable than polarimetry and require only a few milligrams of sample to detect as ...
W K Wilson, T J Scallen, C U Morrow
doaj   +1 more source

From Microorganisms to Biosignatures: Subcritical Water Extraction as a Sample Preparation Technique for Future Life Detection Missions

Geophysical Research Letters, 2022
Amino acids are important targets in the search for life beyond Earth. The types of amino acids, their relative abundances, and enantiomeric excess all serve as biosignatures.
Zuzana Cieslarova, Aaron C. Noell, Peter A. Willis, Maria F. Mora   +3 more
doaj   +1 more source

Comparison of reversed-phase enantioselective HPLC methods for determining the enantiomeric purity of (S)-omeprazole in the presence of its related substances

Journal of Pharmaceutical Analysis, 2016
A simple analytical high-performance liquid chromatography (HPLC) method was applied for the enantiomeric excess determination of esomeprazole ((S)-OME), the enantiopure active ingredient contained in drug products, in the presence of its potential ...
Bruno Gallinella, Rosella Ferretti, Leo Zanitti, Isabella Sestili, Antonina Mosca, Roberto Cirilli   +5 more
doaj   +1 more source