Authors:
Sandra Gaica University of Belgrade Faculty of Chemistry Studentski trg 16 P.O. Box 158 11001 Belgrade Yugoslavia

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Dejan Opsenica University of Belgrade Faculty of Chemistry Studentski trg 16 P.O. Box 158 11001 Belgrade Yugoslavia

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Bogdan Šolaja University of Belgrade Faculty of Chemistry Studentski trg 16 P.O. Box 158 11001 Belgrade Yugoslavia

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Živoslav Tešić University of Belgrade Faculty of Chemistry Studentski trg 16 P.O. Box 158 11001 Belgrade Yugoslavia

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Dušanka Milojković-Opsenica ICTM Center of Chemistry Njegoševa 12 P.O. Box 473 11001 Belgrade Yugoslavia

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The thin-layer chromatographic behavior of cholic acid and fourteen of its synthetic derivatives has been studied in six reversed-phase and three normal-phase systems. Four significantly different adsorbents were used — RP-18-silica, CN-silica, polyacrylonitrile adsorbent, and unmodified silica gel. Reversed-phase chromatography was performed with water-organic modifier (methanol, dioxane, or acetone) binary mobile phases of widely variable composition. An approximately linear relationship was obtained between RM values and the amount of organic modifier in the mobile phases investigated. The effect of mobile-phase composition on retention has been considered and the selectivity of the chromatographic systems is also discussed. Separation mechanisms are proposed on the basis of the results obtained. A positive solvation effect was proposed as a predominant factor determining retention under normal-phase conditions whereas hydrophobic interactions of the substances with non-polar parts of the adsorbents were assumed to be predominant under reversed-phase conditions.

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Journal of Planar Chromatography - Modern TLC
Language English
Size A4
Year of
Foundation
1988
Volumes
per Year
1
Issues
per Year
6
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0933-4173 (Print)
ISSN 1789-0993 (Online)

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