Canadian Medical Guide > Chemicals and Drugs > Polycyclic Hydrocarbons > Steroids > Cholestanes Terms and Definitions

Cholestanes

Medical Definition:	Derivatives of the saturated steroid cholestane with methyl groups at C-18 and C-19 and an iso-octyl side chain at C-17.
Guide Notes:	do not confuse with CHOLESTENES

Cholestanes Categories.

	Cholestanols - Cholestanes substituted in any position with one or more hydroxy groups. They are found in feces and bile. In contrast to bile acids and salts, they are not reabsorbed.
	Cholestanones - CHOLESTANES substituted with any number of keto groups.
	Cholestenes - Steroids with methyl groups at C-10 and C-13 and a branched 8-carbon chain at C-17. Members include compounds with any degree of unsaturation; however, CHOLESTADIENES is available for derivatives containing two double bonds.
	Sterols - Steroids with a hydroxyl group at C-3 and most of the skeleton of cholestane. Additional carbon atoms may be present in the side chain. (IUPAC Steroid Nomenclature, 1987)

Cholestanes Medical Definitions and Terms

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