Premium
One‐step analysis of major bile components in human bile using 1 H NMR spectroscopy
Author(s) -
Nagana Gowda G. A.,
Somashekar B. S.,
Ijare Omkar B.,
Sharma Ajay,
Kapoor V. K.,
Khetrapal C. L.
Publication year - 2006
Publication title -
lipids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.601
H-Index - 120
eISSN - 1558-9307
pISSN - 0024-4201
DOI - 10.1007/s11745-006-5007-8
Subject(s) - taurine , bile acid , bile pigments , gallbladder , chemistry , urea , cholesterol , quantitative analysis (chemistry) , nuclear magnetic resonance spectroscopy , biochemistry , chromatography , medicine , amino acid , stereochemistry , organic chemistry , pigment
Human gallbladder bile dissolved in dimethyl‐sulfoxide provides sharp and resolved signals for major bile components in 1 H NMR spectra. Characteristic well‐resolved marker signals that invariably appear in 1 H NMR spectra of bile were identified for cholesterol (H18 methyl signal at 0.643 ppm), lipids (glycerol CH signal at 5.064 ppm), total bile acids (H18 signals in the range 0.520–0.626 ppm), total glycine conjugated bile acids (NH signal at 6.958 ppm), total taurine conjugated bile acids (NH signal at 7.646 ppm), and urea (NH 2 signal near 5.48 ppm), which enabled their rapid and accurate analysis. Excellent linearity and precision of quantitative analysis was observed for all the identified bile components ( R 2 >0.99 for all). The method was demonstrated on gallbladder bile from 19 patients with gallbladder diseases. Urea in bile was identified by NMR for the first time and its quantitative analysis, along with several other bile components, is presented. The majority of the bile components could be analyzed in a single step. Accurate and rapid quantification of several bile components noninvasively by using the method presented herein may have far‐reaching implications in the study of bile acid metabolism and pathophysiology of various hepatobiliary and gastrointestinal diseases.