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Nordeoxycholic acid is a metabolite of the bile acid norcholic acid and a 23-carbon derivative of deoxycholic acid .1 Levels of nordeoxycholic acid are decreased in the liver of rats in a high-fat diet model of non-alcoholic fatty liver disease (NAFLD) and serum levels are lower in men compared with women.2,3 Nordeoxycholic acid has commonly been used as an internal standard for the quantification of bile acids in various sample types by GC- and LC-MS.4,5

1.Nakatomi, F., Kihira, K., Kuramoto, T., et al.Intestinal absorption and metabolism of norcholic acid in ratsJ. Pharmacobiodyn8(7)557-563(1985) 2.Tang, Y., Zhang, J., Li, J., et al.Turnover of bile acids in liver, serum and caecal content by high-fat diet feeding affects hepatic steatosis in ratsBiochim. Biophys. Acta Mol. Cell Biol. Lipids1864(10)1293-1304(2019) 3.Xie, G., Wang, Y., Wang, X., et al.Profiling of serum bile acids in a healthy Chinese population using UPLC-MS/MSJ. Proteome Res.14(2)850-859(2015) 4.Bergeron, A., Furtado, M., and Garofolo, F.Importance of using highly pure internal standards for successful liquid chromatography/tandem mass spectrometric bioanalytical assaysRapid Commun. Mass Spectrom.23(9)1287-1197(2009) 5.Evrard, E., and Janssen, G.Gas-liquid chromatographic determination of human fecal bile acidsJ. Lipid Res.9(2)226-236(1968)

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