Cholesterol steroids is one of the most important: it is a lipid molecule consists of four rings of carbon atoms and an aliphatic tail as well as possible functional groups.
polycyclic The basic structure is called peridrofenantrene cyclopentane.
cholesterol comes from the greek word chole (bile) and stereos (solid), but was used for the first time in 1894. The ending-ol comes from the fact that the C3 ring carbon of the first [A] is a hydroxyl radical.
Its presence had been detected in the calculations of the gall bladder as early as 1784, but in 1975 the Nobel Prize John W. Cornforth said spatial orientation of the hydrogen atoms on the molecule.
Cholesterol is essential for animal life. Plants contain only slight traces cholesterol and other lipid substances structurally similar (fitosterine or phytosterols).
man produces most independent biosynthesis of cholesterol needed in adults between 1 and 2 grams per day. Only a small proportion (on average 0.1 to 0.3, up to 0.5 grams) is taken with food: most of the cholesterol metabolism occurs in the liver. The content of cholesterol in the human body is approx. 150 grams.
Massimo Capobianco
0 comments:
Post a Comment