نتایج جستجو برای: isocratic

تعداد نتایج: 1335  

Journal: :Journal of chromatographic science 2012
Ninus Simonzadeh Bruce Ronsen

Sorbitol and glycerol, along with other inactive ingredients such as preservatives and dyes, are commonly used in various pharmaceutical and personal care products. To accurately assess the effectiveness of various formulations containing sorbitol and/or glycerol, their quantitative determination is essential. In the current study, two types of detectors (a Varian evaporative light scattering d...

Journal: :Analytical chemistry 2008
Andrew J Alpert

If an ion-exchange column is eluted with a predominantly organic mobile phase, then solutes can be retained through hydrophilic interaction even if they have the same charge as the stationary phase. This combination is termed electrostatic repulsion-hydrophilic interaction chromatography (ERLIC). With mixtures of solutes that differ greatly in charge, repulsion effects can be exploited to selec...

Journal: :Analytical chemistry 2002
Oliver Hofstetter Heather Lindstrom Heike Hofstetter

This paper describes the application of stereoselective antibodies as tailor-made chiral selectors for the separation of enantiomers in HPLC under isocratic conditions. Stereoselective monoclonal antibodies to D- and L-alpha-amino acids, raised against protein conjugates of p-amino-D- and L-phenylalanine, were immobilized on a synthetic high-flow-through support material and used for rapid enan...

Journal: :Journal of chromatography. A 2011
Gwenaëlle S Philibert Susan V Olesik

Hydrophilic interaction chromatography (HILIC) is a liquid chromatographic separation mechanism commonly used for polar biological molecules. The use of enhanced-fluidity liquid chromatography (EFLC) with mixtures of methanol/water/carbon dioxide is compared to acetonitrile/water mobile phases for the separation of nucleosides and nucleotides under HILIC conditions. Enhanced-fluidity liquid chr...

Journal: :Chromatography 2021

In this paper we describe a highly sensitive and selective LC method for the determination of 5-hydroxyindoles (serotonin, N-acetylserotonin, 5-hydroxyindole-3-acetamide, 5-hydroxytryptophan, 5-hydroxyindole-3-acetic acid, 5-hydroxytryptophol) through post-column electrochemical derivatization fluorescence detection. These can be separated within 40 min by reversed-phase liquid chromatography u...

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