Differing from cholesterol in the absence of the double bond.
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It shows an abnormally high concentration of the diagnostic metabolite cholestanol (C-18 [H.
First, the relative peak area compared with cholestanol was very similar in the gas chromatogram and the 1-dimensional [sup.
Cholesterol has been shown to biologically hydrogenate into coprostanol and cholestanol (dihydrocholesterol) in anoxic sediments, and the conversion to coprostanol has been shown to be negligible.
Since coprostanol is thought to originate from fecal sources, and cholesterol and cholestanol represent sewage and nonsewage sources, this ratio may be used as a more specific and simplified indicator of sewage contamination.