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  Product Name: -Tocopherol \Vitamin E
Synonyms  DL-alpha-Tocopherol; 3,4-Dihydro-2,5,7,8-tetramethyl-2-(4,8,12-trimethyltridecyl)-2H-1-benzopyran-6-ol
 
Molecular Formula:C29H50O2
Molecular Weight:430.71
CAS Registry Number:10191-41-0
EINECS:233-466-0
-Tocopherol is a type of with formula C29H50O2. It has "E307".
-Tocopherol is a form of that is preferentially absorbed and accumulated in humans. The measurement of "vitamin E" activity in (IU) was based on fertility enhancement by the prevention of spontaneous abortions in pregnant rats relative to alpha-tocopherol.
There are three in alpha-tocopherol, so this is a molecule. The eight of alpha-tocopherol differ in the arrangement of groups around these stereocenters. In the image of RRR-alpha-tocopherol below, all three stereocenters are in the R form. However, if the middle of the three stereocenters were changed (so the hydrogen was now pointing down and the pointing up), this would become the structure of RSR-alpha-tocopherol. RSR-alpha-tocopherol and RRR-alpha-tocopherol are of each other. These stereoisomers can also be named in an alternative older nomenclature, where the stereocenters are either in the d or l form.
1 IU of tocopherol is defined as milligrams of RRR-alpha-tocopherol (formerly named d-alpha-tocopherol or sometimes ddd-alpha-tocopherol). 1 IU is also defined as 1 milligram of an equal mix of the eight stereoisomers, which is a called . This mix of stereoisomers is often called dl-alpha-tocopheryl acetate, even though it is more precisely dl,dl,dl-alpha-tocopheryl acetate). However, 1 IU of this racemic mixture is not now considered equivalent to 1 IU of natural (RRR) -tocopherol, and the and the now convert IU's of the racemic mixture to milligrams of equivalent RRR using 1 IU racemic mixture = 0.45 "milligrams -tocopherol".
 
 
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