Astaxanthin quiz

More questions about Astaxanthin

These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.

1. 1 Easy

   In which eye part did a monkey study measure astaxanthin?

   Answer: Retina

   Why: After 10 days of oral dosing, researchers detected astaxanthin in a monkey's retina, showing it can reach this light-sensitive tissue.

2. 2 Medium

   Which eye muscle do astaxanthin eye-strain studies target?

   Answer: Ciliary muscle

   Why: That muscle bends the lens for close focus, but in 2009 EFSA found no proven link between astaxanthin and normal visual acuity.

3. 3 Hard

   Which yeast species is a commercial source of astaxanthin?

   Answer: Phaffia rhodozyma

   Why: It honours yeast expert Herman Phaff, was first found in tree sap in Japan and Alaska, and now colors salmon feed.

4. 4 Easy

   At quenching singlet oxygen, how many times more potent than Vitamin C is astaxanthin?

   Answer: 6,000 times

   Why: Presented at a 2007 carotenoid meeting in Osaka: astaxanthin also beat coenzyme Q10 about 800-fold and green tea catechins about 550-fold.

5. 5 Medium

   What food source provides the highest astaxanthin levels for wild salmon?

   Answer: Krill

   Why: Salmon cannot make the pigment at all, and sockeye carries the most of any salmon at 26 to 38 mg per kilo of flesh.

6. 6 Hard

   What does the astaxanthin stored in a migrating salmon's muscle mainly do?

   Answer: Guards fat from oxidation

   Why: Migrating salmon stop feeding, and the pigment later shifts out of the muscle into skin and eggs at spawning.