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- W2045583865 abstract "Optimal conditions for the separation of the epimers of homologous 16a,17a-acetals of 6a,9a-difluoro-, 9a-fluoro- or non-fluorinated 16a-hydroxyprednisolone on μBondapak C18 have been evaluated. The separation factor increases strongly with increasing alkyl chain length at the asymmetrical carbon, C-22, the position where configurational differences of the molecules are located, and weakly with fluorine substitution at 6a and 9a positions. Acetate esterification of the C-21 hydroxy group does not influence the separation factor. Of the different types of organic modifier added to water in the eluents, ethanol gives the best results. Both the capacity and the separation factors increase with a decrease in the concentration of the organic modifier in the mobile phase, resulting in large improvements of separation of epimers. The retention mechanisms are discussed on the basis of molecular structures and current models of the chromatographic system." @default.
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- W2045583865 date "1978-09-01" @default.
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- W2045583865 title "Separation of epimers of budesonide and relatedd corticosteroids by reversed bonded-phase liquid chromatography" @default.
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