Isocholesterol

A solution of cholesterol in arsenic trichloride is colored pink, the color rapidly changing to cherry-red, accoding^([sic]) to Kahlenberg (Journ. biol. Chem. through Rép. pharm. XXXV. 282), while isocholesterols produce a blue color, which gradually changes to purple, dark red and finally to green.

It is of interest that horse sebum contains squalene, whereas the seba of ruminants, including sheep, goat, llama and dromedary, contain isocholesterol.

Guinea pig, mouse and rabbit. All these seba are similar in lacking squalene, isocholesterol and triglycerides, exhibiting low values for free fatty acids and containing lathosterol (Wheatley, 1953, 1956; Wheatley & James, 1957).