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Vitamin A

CAS #302-79-4

Vitamin A is a group of unsaturated nutritional organic compounds that includes retinol, retinal, retinoic acid, and several provitamin A carotenoids.
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Introduction

Vitamin A is a group of unsaturated nutritional organic compounds that includes retinol, retinal, retinoic acid, and several provitamin A carotenoids (most notably bet a-carotene). It is also known as anti-dry eye vitamin, is one of the essential nutrients for humans. The precursor of vitamin A is carotene present in various plants.

Item Specification Result
Appearance   Light yellow to tan granular powder Light yellow granular powder
Identification Positive reaction Conform
Loss on drying Not more than 5.0% 3.00%
Assay 90.0120.0% 110.00%
Particle size: 100% pass 20 mesh 100%
Heavy metals Not more than 10ppm Conform
Arsenic Not more than 2ppm Conform
Labelled amount 1,000,000IU/G <0.0005%

Functions and Applications

1. It is important for growth and development, for the maintenance of the immune system and good vision.    
2. It is needed by the retina of the eye in the form of retinal, which combines with protein opsin to form rhodopsin, the light-absorbing molecule necessary for both low-light (scotopic vision) and color vision.    
3. It also functions in a very different role as retinoic acid (an irreversibly oxidized form of retinol), which is an important hormone-like growth factor for epithelial and other cells. 

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