Konu: Vitamin A

A vitamini ile ilgili bir belge


Vitamin A (Retinol)

General information
Chemistry
The term ‘vitamin A’ refers to a group of fat-soluble compounds known as ‘the retinoids’. Generally, their structure consists of a ß-ionone ring, a conjugated isoprenoid side chain and a polar terminal group. The parent compound all-trans-retinol and its fatty acid ester derivatives are referred to as pre-formed vitamin A, as opposed to the vitamin A precursors, such as ß-carotene. Following the recommendations of the Food Agricultural Organisation (FAO) and World Health Organisation (WHO), estimations of vitamin A requirement and food content take into account the different activities and variable absorption of vitamin A and provitamin A, and are expressed in terms of ‘retinol equivalent’ (RE) where 1 g RE = 1 g retinol = 1.78 g retinyl palmitate = 6 g ß-carotene = 12 g other carotenoids with provitamin A activity = 3.33 IU vitamin A activity from retinol.

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