Lipophilicity Determination of Highly Lipophilic Compounds by Liquid Chromatography

• Published in: Chemistry & biodiversity Vol. 6; no. 11; pp. 1828 - 1836
• Main Authors: Guillot, Amandine, Henchoz, Yveline, Moccand, Cyril, Guillarme, Davy, Veuthey, Jean-Luc, Carrupt, Pierre-Alain, Martel, Sophie
• Format: Journal Article
• Language: English
• Published: Zürich WILEY-VCH Verlag 01.11.2009; WILEY‐VCH Verlag
• Subjects: Algorithms; Buffers; Chromatography, High Pressure Liquid - instrumentation; Chromatography, High Pressure Liquid - methods; Hydrogen-Ion Concentration; Indicators and Reagents; Lipids - chemistry; Lipophilic determination; Lipophilicity; Liquid chromatography; Methanol - chemistry; Pharmaceutical Preparations - chemistry; Pharmacokinetics; Solubility; Solvents
• ISSN: 1612-1872; 1612-1880
• DOI: 10.1002/cbdv.200900115

Different experimental strategies using short columns in both conventional liquid chromatography (HPLC) and ultra‐high pressure liquid chromatography (UHPLC) were evaluated to allow, for the first time with these techniques, the lipophilicity determination of compounds with log P>5. Various organic modifiers, stationary phases, and elution modes were tested on 14 rigid compounds with a CLogP between 5 and 8, and 38 compounds with log Poct from 0 to 5. The best results in HPLC were obtained with the 20‐mm Discovery ® RP Amide C16 stationary phase in isocratic mode using MeOH as organic modifier. To improve analysis time, the UHPLC approach was then evaluated. Consequently, a generic method was developed with a 30‐mm Acquity BEH Shield RP18 column in gradient mode using MeOH as organic modifier, allowing a fourfold gain of time compared to the HPLC method, for the highly lipophilic compounds tested. Finally, the most rapid and accurate results were obtained with a 10‐mm HypersilTM GOLD Javelin HTS stationary phase in UHPLC, enabling an eightfold gain of time compared to the HPLC method.