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1. Conjugated bile pigments, separated in two fractions by semi-quantitative t.l.c. performed on silicic acid with phenol/water as the developing solvent, were treated with diazotized ethyl anthranilate. Resulting dipyrrylazo derivatives were analysed by quantitative t.l.c. 2. The tentative structure elucidation of tetrapyrrolic bilirubin conjugates and semi-quantitative evaluation of rat bile, post-obstructive human bile and dog bile composition is presented. 3. Homogeneous and mixed hexuronic acid diesters of bilirubin containing glucuronic acid constitute 51% of the total conjugates in normal rat bile, 45% of those in human post-obstructive bile and 38% of those in obstructed rat biles. 4. Monoconjugated bilirubin amounts to 33% of total conjugated bile pigments in normal rat bile, and 17 and 14% in post-obstructive hepatic human bile and gall-bladder bile of dog respectively. After loading with unconjugated bilirubin a greater amount of monoconjugates (56%) occur in the rat bile, whereas bilirubin diglucuronide excretion is decreased (34%). 5. In gall-bladder bile of normal dog, 40% of glucose-containing diconjugates, 32% of homogeneous and/or mixed hexuronic acid (mainly glucuronic acid) diesters of bilirubin and 14% of xylose-containing diconjugates are estimated. 6. Increased amounts of bilirubin conjugates, including some with unidentified uronic acid groups, were observed in cholestatic rat biles and quantities of conjugates with glucuronic acid were decreased.

Bilirubin conjugates in bile of man, rat and dog. Semi-quantitative analysis of bile composition by thin-layer chromatography