Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0019158 (hepatitis)
 30,205 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

A method is described to assay sulphated and non-sulphated bile acids in serum using gas-liquid chromatography. Previously described techniques have been substantially modified to allow analysis of free and conjugated salts of the four major bile acids with particular care to ensure quantitative recoveries of lithocholic acid, its conjugates and sulphate esters. Losses of lithocholic acid inherent in some methods have been reduced by avoidance of column chromatography with alumina and extraction of lipid contaminants into heptane. Assay of the proportion of serum bile acids present as sulphate esters is achieved by the routine use of column chromatography to separate sulphated bile acids from non-sulphated bile acids followed by solvolysis of the sulphated bile acids before deconjugation. Careful selection of the conditions of strong alkaline hydrolysis ensures deconjugation of all bile salt conjugates including lithocholic conjugates which are not completely hydrolysed in weaker alkaline solutions. The trifluoroacetate derivatives of the methyl esters of the bile acids are chromatographed using 5-beta-cholanic acid as an internal standard with clear separation of the four major bile acids from the internal standard. In 10 fasting control subjects the mean serum total bile acid concentration was 5.3 muM (RANGE 1.1-16.4) including 0.7 mum sulphated bile acid (range 0-1.8). In 10 patients with acute viral hepatitis the total bile acid concentration was elevated in some but normal in others (mean 44.9 muM, range 2.7-80.3). The percentage of the total bile acid sulphated was not significantly different in the hepatitis patients compared to controls (controls 13%, range 0-35; hepatitis 23%, range 0-52). Lithocholic acid made up 13% of the total bile acid in controls (0-32%) and 18% in hepatitis patients (0-53%). Most of this lithocholic acid was sulphated (controls 81%, range 30-100; hepatitis 67%, range 37-100). Unconjugated bile acids were demonstrated in the serum of a few patients with acute viral hepatitis but in no control subjects.
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PMID:The measurement of sulphated and non-sulphated bile acids in serum using gas-liquid chromatography. 117 99

Using an aluminum oxide column, we fractionated and quantitatively determined urinary monohydroxy bile acids in young infants. For comparison purposes, monohydroxy bile acids were also measured in urine from older children and adults with obstructive jaundice. Lithocholic acid was not found in any specimens of the young infants examined, while 3 beta-hydroxy-5-cholenoic acid was detected in all. In the biliary atresia group, 3 beta-hydroxy-5-cholenoic acid excreted was 0.45+/-0.28 mumol per day (n=7), and in the neonatal hepatitis group, 0.48+/-0.44 mumol per day (n=9). The mean rate of 3 beta-hydroxy-5-cholenoic acid to total urinary bile acids in the biliary atresia group was 2.1%, and 1.3% in the neonatal hepatitis group. In the older children and adults with obstructive jaundice (n=6), 3 beta-hydroxy-5-cholenoic acid was excreted at a mean rate of 3.9% of total urinary bile acids, ranging from 0.63 to 14.81 mol per day. The excretion rate of 3 beta-hydroxy-5-cholenoic acid was related to that of chenodeoxycholic acid (p less than 0.05) in infants, while it was related to that of both chenodeoxycholic acid (p less than 0.01) and cholic acid (p less than 0.05) in older children and adults.
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PMID:Urinary monohydroxy bile acids in young infants with obstructive jaundice. 713 22