Chapter 9: Fat-soluble Vitamins (Vitamin E) Flashcards
other names:
-tocopherol
-antisterility factor
-antioxidant vitamin
vitamin e
vitamin e - chemistry
include alpha, beta, gamma, and delta _____
tocopherols
vitamin e - chemistry
contains the unsaturated alpha, beta, gamma, and delta
tocotrienols
vitamin e - chemistry
most widespread and biologically active form
alpha tocopherol
vitamin e - chemistry
stable in _____ and _____
temp and acids
vitamin e - chemistry
oxidized in the presence of _____ or _____ and iron sats
rancid fats or lead
vitamin e - chemistry
unstable to _____, ultraviolet light, and oxygen
alkali
vitamin e - chemistry
vitamin content of food is expressed as _____, with TE corresponding 1 mg of alpha tocopherol
tocopherol equivalents
vitamin e - absorption, transport, and utilization
absorbs _____ of dietary vitamin e
40-60%
vitamin e - absorption, transport, and utilization
absorption rate decreases as vitamin consumption _____
increases
vitamin e - absorption, transport, and utilization
absorbed from the _____ with the aid of bile salts
gut
vitamin e - absorption, transport, and utilization
absorbed from the gut with the aid of
bile salts
vitamin e storage in the body
fatty tissue and liver
vitamin e - absorption, transport, and utilization
enters the _____ and carried within the chylomicrons
lymphatic system
vitamin e - absorption, transport, and utilization
transported by _____ to be stored in the liver
lipoproteins
vitamin e - absorption, transport, and utilization
normal plasma tocopherol concentrations are between _____ mg/100Ml; drops rapidly when withdrawn from the diet
0.6 and 1.6 mg
vitamin e - absorption, transport, and utilization
excreted in
feces and skin
vitamin e - relationship with other nutrients
vitamin e and _____ (a component of glutathione peroxidase) both function to protect the cells from the destructive effects of oxygen free radicals
selenium
vitamin e - relationship with other nutrients
vitamin e and the sulfur-containing amino acids, together with _____ (3) are interrelated
zinc, manganese, copper
vitamin e - relationship with other nutrients
these amino acids are needed for the synthesis of glutathione that serves as the reducing agent in the glutathione-peroxidase reaction
sulfur-containing amino acids
vitamin e - relationship with other nutrients
activate the enzymes important in regulating oxygen radicals
zinc, manganese, copper
vitamin e - relationship with other nutrients
when _____ is deficient, vitamin e lowers the rate at which vitamin a is depleted from the liver
vitamin a
vitamin e - relationship with other nutrients
requirement for vitamin e increase with increased intake of _____
pufa
vitamin e - functions
most important parts of the body which vitamin e exerts its antioxidant effect is in the _____, where the exposure of cells to oxygen is maximal
lungs