Vitamin E Flashcards
Vitamin E is in how many vitamers
8
what are the 8 vitamers of vitamin E
4 tocopherol w SATURATED side chains
4 tocotrioenols with UNSATURATED side chains
what carbon is the hydroxyl group of the vitamers attached to
C6
_____ has the highest biological activity of all the vitamers
alpha tocopherol
_______ is the only form of vitamin E recognized as being able to meed the human requirements
alpha tocopherol
the biologically active form and the only form found naturally in humans
NATURAL alpha tocopherol (RRR a-tocopherol)
mixture of 8 sterioisomers, which half are not biologically active
synthetic alpha tocopherol
sources of vitamin e
plant oils
nuts
grains
green veggies
stability of vitamin E
oxidized with lengthy exposure to oxygen light or heat
tocopherols are found free in foods but ______ ester forms from supplements require hydrolyzation before absorption
synthetic
______ are found esterified in foods and therefore also require hydrolyzation
tocotrienols
all forms of vitamin e are ______ and require ____ for micelle formation
fat soluble, bile
vitamin E is absorbed primarily in? and how?
jejun by passive diffusion
once inside the enterocyte, tocopherols and tocotrienols are incorporated into _____ for ransport
chylomicrons
during transport, tocopherons and tocotrienols are transferred among-____
lipoproteins