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J Pharm Biomed Anal. 1990;8(3):235-41.

Group separation of free and conjugated bile acids by pre-packed anion-exchange cartridges.

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Dipartimento di Scienze Farmaceutiche, Università di Ferrara, Italy.


A rapid and simple procedure for the group separation of the major free and conjugated bile acids of man is described. After initial extraction with Bond Elut C18 cartridges, the analytes are fractionated into the unconjugated, glycine- and taurine-conjugated forms using disposable Bond Elut SAX columns and methanol-acetate buffer eluents. The method is found to be accurate and reproducible and to afford complete resolution between fractions. Free and conjugated bile acids present in human bile and gastric juice are assayed by high-performance liquid chromatography, after extraction and group separation according to the described procedure.

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