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m Reported hew are two solvent systems that have proved useful for the quali tativc separation of certain free and conjugated bile acids.Although Ganshirt, Koss, and Morianz (1) have reported other systems, we have found those described here to be more satisfactory.The thin layers of silicic acid on 20 x 20 cm glass plates were prepared, using a commercial apparatus (thin layer chromatography according to Stahl, C.
Alan F. Hofmann (Mon,) studied this question.