The effect of stationary phase on lipophilicity determination of beta-blockers using reverse-phase chromatographic systems.
Evaluation of lipophilicity parameters for basic compounds using different chromatographic stationary phases is presented. An HPLC method for determination of lipophilic molecule-stationary phase interactions was based on gradient analysis. Differences in correlation between the lipophilicity of compounds and experimental chromatographic results obtained in pseudo-membrane systems showed a strong influence of stationary phase structure and physico-chemical properties. beta-Blocker drugs with varying lipophilicity and bio-activity were chosen as test compounds. The stationary phases used for the study were monolithic rod-structure C18 and silica gel octadecyl phase SG-C18 as reference material. The second group was silica gel-based polar-embedded alkylamide and cholesterolic phases. The mobile phase was composed of acetonitrile or methanol with ammonium acetate, and a linear gradient of methanol and acetonitrile in mobile phase was performed. A linear correlation of plots of log k(g) = f(log P) was observed, especially for polar-embedded phases, and this allowed log P(HPLC) to be calculated. The behavior of stationary phases in methanol and acetonitrile buffer showed differences between obtained log P(HPLC) values.
Welerowicz
Tomasz
T
Department of Environmental Chemistry and Ecoanalytics, Faculty of Chemistry, Nicolas Copernicus University, Gagarin Street 7, PL-87100 Torun, Poland.
Buszewski
Boguslaw
B
D000319:Adrenergic beta-Antagonists / Q000032:analysis / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation / Q000379:methods*; D057927:Hydrophobic and Hydrophilic Interactions; D008055:Lipids / Q000737:chemistry*; D008801:Mexiletine / Q000032:analysis / Q000737:chemistry; D011412:Propanolamines / Q000032:analysis / Q000737:chemistry*; D021281:Quantitative Structure-Activity Relationship
D000319:Adrenergic beta-Antagonists; D008055:Lipids; D011412:Propanolamines; D008801:Mexiletine