Nutrition Enhancers, Food Additives, VA

Nutrition Enhancers, Food Additives, VA

Product name :Nutrition enhancers, food additives, VA CAS :68-26-8 Molecular formula:C20H30O Molecular weight :286.45 Appearance :Pale yellow crystalline powder Assay :99% Packing :1kg shipping :by sea or air Usages:Involved in maintaining the dark vision photoreceptor cycle in the visual cells

Product Details

Product name :Nutrition enhancers, food additives, VA

CAS :68-26-8

Molecular formula:C20H30O

Molecular weight :286.45

Appearance :Pale yellow crystalline powder

Assay :99%

Packing :1kg

shipping :by sea or air

Usages:Involved in maintaining the dark vision photoreceptor cycle in the visual cells

 

 

 

Details

 

One of the classic, or earliest known, functions of vitamin A is its role in maintaining the dark photoreceptor cycle in the visual cells. Rods in the retina contain rhodopsin, which is made by combining 11- cis - retinal with opsin and is sensitive to dark light. After being sensitized by retinoids, 11-cis retinoids are converted to all-trans retinoids and separated from retinoids to generate visual electrical signals. The dissociated all-trans retinol is reduced to all-trans retinol in rod cells and transported to retinal pigment epithelial cells. Together with the all-trans retinol from plasma, the complex isomerization process is initiated to participate in the supply of 11-cis retinal needed to resynthesize retinoids and maintain dark light adaptation. Thus, to maintain good dark vision, a constant supply of 11- cis - retinaldehyde is needed for rod cells. When vitamin A is deficient, the supply of 11- cis retinaldehyde decreases and the dark adaptation time is prolonged.


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