I determined the beta carotene content of tomato by UV spectrophotometry and I want to convert the result to vitamin A. Is there any factor for the conversion?
One International Unit (I.U.) = 0.3 mcg. of retinol
= 0.6 mcg. of beta-carotene
= 1.2 mcg. of other total mixed carotenoids with vitamin A activity
http://www.fao.org/docrep/003/x6877e/X6877E22.htm
Both information varies only by unit but it is the same result. Thank you for sharing.
The 1:2 converison factor from betacarotene to vitamin A was used before the IOM proposed the new concept in 2001:
1 retinol activity equivalent (μg RAE)
= 1 μg of all-trans-retinol
=2 μg of supplemental all-trans-β-carotene carotene
= 12 μg of dietary all-trans-β-carotene
= 24 μg of other dietary provitamin A carotenoids
- Badges
- Science topic
- Similar topics
- Medicine
- Nutrition and Dietetics
- Nutritional Medicine
- Food Science