Journal of Lipid Research, Vol. 10, 546-554, September 1969
Copyright © 1969 by Lipid Research, Inc.

Determination of individual conjugated bile acids in human bile

Ryuzo Shioda , Peter D. S. Wood , and Laurance W. Kinsell

The Institute for Metabolic Research, Highland General Hospital, Oakland, California 94606

A method has been developed and validated for the determination of the six major conjugated bile acids, cholesterol, and total phospholipids in bile of human subjects previously injected with 4-¹⁴C-cholesterol.

The procedure is designed for use with 5-10 ml of duodenal or T-tube bile and eliminates difficulties associated with existing methods for bile acid determination, in particular the requirement for preliminary saponification under pressure or the use of paper chromatography. Saponification under pressure is employed only in steps where partial destruction of the steroid moiety of conjugated bile acids is not a crucial matter.

A preliminary Folch extraction and washing step separated free cholesterol and phospholipids (bottom layer) from the six major conjugated bile acids (top layer). The conjugated bile acids were then fractionated cleanly by thin-layer chromatography to give four groups, the ¹⁴C content of each of which was determined. A second aliquot of the top layer was used to determine (after deconjugation) the radioactivity ratio of deoxycholic acid to chenodeoxycholic acid for the two unresolved groups (dihydroxycholanoic acid conjugates with glycine and taurine, respectively). A third aliquot was used for determination of specific activities of the methyl esters of cholic, chenodeoxycholic, and deoxycholic acids derived from the total bile salts. Appropriate calculations yielded the concentration in bile of all six major bile acid conjugates.

Supplementary key words thin-layer chromatography • glycine conjugates • taurine conjugates • cholic acid • deoxycholic acid • chenodeoxycholic acid • cholesterol • phospholipids • ¹⁴C-steroids

Submitted on September 3, 1968
Accepted on June 2, 1969

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