Journal of Lipid Research 1980-05-01

Loss of tritium from coprostanone derived from [1,2(n)-3H]cholesterol or [7(n)-3H]cholesterol.

G E Mott, E M Jackson

Index: J. Lipid Res. 21(4) , 480-4, (1980)

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Abstract

After oral administration of a mixture of [1,2(n)-3H]cholesterol and [4-14C]cholesterol to a baboon, fecal coprostanone had a 46% lower 3H/14C ratio than the dose administered. Loss of 3H by enolization of the 3-ketone could account for the decrease in 3H/14C. If [7(n)-3H]cholesterol was administered instead of [1,2(n)-3H]cholesterol a 23% loss of 3H from coprostanone was found. Procedures requiring measurement of 3H-coprostanone derived from [1,2(n)-3H]- or [7(n)-3H]cholesterol could be seriously in error unless an appropriate correction for loss of 3H is made.