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Taurochenodeoxycholic acid-d4 is intended for use as an internal standard for the quantification of taurochenodeoxycholic acid by GC- or LC-MS. TCDCA is a taurine-conjugated form of the primary bile acid chenodeoxycholic acid .1 Serum levels of TCDCA increase approximately 5-fold within two hours and begin to decrease within four hours during an oral lipid tolerance test in humans.2 Serum levels of TCDCA are increased in patients with liver cirrhosis and may serve as a marker of disease progression.3

1.Hoffman, A.F.The continuing importance of bile acids in liver and intestinal diseaseArch. Intern. Med.159(22)2647-2658(1999) 2.Schmid, A., Neumann, H., Karrasch, T., et al.Bile acid metabolome after an oral lipid tolerance test by liquid chromatography-tandem mass spectrometry (LC-MS/MS)PLoS One11(2)e0148869(2016) 3.Wang, X., Xie, G., Zhao, A., et al.Serum bile acids are associated with pathological progression of hepatitis B-induced cirrhosisJ. Proteome Res.15(4)1126-1134(2016)

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