Multiple choice

Which of the following pigments is the only xanthophyll that is known to possess pro-vitamin A activity for mammals?

  1. Lutein

  2. Zeaxanthin

  3. Neoxanthin

  4. Violaxanthin

  5. Cryptoxanthin
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

β-Cryptoxanthin has been isolated from a variety of sources including the petals and flowers of plants in the genus Physalis, orange rind, papaya, egg yolk, butter, apples, and bovine blood serum. It contains a beta-ionone ring, and thus β-cryptoxanthin is the only xanthophyll that is known to possess pro-vitamin A activity for mammals.

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