Vitamin E: Structure, Function, and Sources
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Questions and Answers

Which of the following statements about the primary function of vitamin E is correct?

  • Vitamin E functions as an antioxidant preventing nonenzymic oxidation. (correct)
  • Vitamin E acts as an enzyme in the oxidative processes.
  • Vitamin E's primary role is in glucose metabolism.
  • Vitamin E increases the enzymic oxidation of saturated fatty acids.
  • Which source has the highest concentration of vitamin E?

  • Fish
  • Vegetable oils (correct)
  • Eggs
  • Liver
  • What is the Recommended Dietary Allowance (RDA) for α-tocopherol in adults?

  • 5 mg
  • 15 mg (correct)
  • 10 mg
  • 20 mg
  • As the intake of which type of nutrient increases, the requirement for vitamin E also increases?

    <p>Polyunsaturated fatty acids</p> Signup and view all the answers

    At what daily dose has no toxicity been observed for vitamin E?

    <p>300 mg/day</p> Signup and view all the answers

    Study Notes

    Vitamin E

    • The E vitamins consist of eight naturally occurring tocopherols, with α-tocopherol being the most active.

    Functions of Vitamin E

    • Acts as an antioxidant to prevent nonenzymic oxidation of cell components, such as polyunsaturated fatty acids, by molecular oxygen and free radicals.

    Sources of Vitamin E

    • Vegetable oils are rich sources of vitamin E.
    • Liver and eggs contain moderate amounts of vitamin E.
    • The RDA for α-tocopherol is 15mg for adults.
    • Vitamin E requirement increases with the intake of polyunsaturated fatty acid.

    Toxicity of Vitamin E

    • Vitamin E is the least toxic of the fat-soluble vitamins.
    • No toxicity has been observed at doses of 300 mg/day.

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    Description

    Learn about the antioxidant properties and sources of Vitamin E, including its role in preventing cell component oxidation and its abundance in vegetable oils, liver, and eggs.

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