Retinol; Vitamin A

Name: vitaminA

Chemical name: retinol

For short: vitamin A

Specifications: 99%

Appearance: pale yellow flake crystal

Odour: no rancidity, almost no odour or faint fishy odour

Product properties: flake crystal

Detection method: UV

Solubility: fat soluble vitamins

Molecular formula: C20H28O

CAS: 68-26-8

EINECS: 200-683-7

Molecular weight: 286.4516

VitaminA, also known as retinol (its aldehyde derivative retinaldehyde), is A class of substances with retinol biological activity, consisting of unsaturated mono-alcohols with lipid rings, including vitamins A1 and A2 from animal food sources.Vitamin A1 is found mostly in mammals and saltwater fish, while vitamin A2 is found mostly in freshwater fish.Because the activity of vitamin A2 is relatively low, so commonly referred to as vitamin A refers to vitamin A1.

2. Vitamin A belongs to the category of fat-soluble vitamins, and vitamin D (also known as calciferol), vitamin E and vitamin K also belong to the category of fat-soluble vitamins.The other is water-soluble vitamins, mainly B vitamins (mainly including B1, B2, B3, B6, B12), vitamin C (also known as ascorbic acid), vitamin PP (also known as niacin), vitamin H and vitamin M (also known as folic acid), and so on.

3. Plant-derived carotene and other carotenoids are synthesized in the human body

(http://www.chemdrug.com/article/8/)

Conversion efficiency of vitamin A and -carotene is high.In vivo, under the catalysis of pit-carotene -15, 15 '-dioxygenase (dioxygenase), you can convert pit-carotene into two-molecule ratinal, which is reduced to retinol under the action of pit-carotene reductase.But you can also make astaxanthin (a strong antioxidant)

A fat-soluble vitamin that is stable to heat, acids, and bases and is easily oxidized.Vitamin A includes A1 and A2, which is retinol.Vitamin A2, or 3-dehydroretinol, is 40% as biologically active as vitamin A1.

Vitamin A can promote growth and reproduction, maintain normal secretion of bone, epithelial tissue, vision and mucous membrane epithelium and other physiological functions, and vitamin A and its analogical substances can prevent precancerous lesions.Lack of performance for growth retardation, dark adaptation to the ability of the formation of night blindness.Because epidermis and mucous membrane epithelial cell are dry, descaling, excessive keratinization, lacrimal gland secretion decreases, produce dry eye disease thereby, serious person corneal malacia, perforation and blindness.Respiratory epithelial cells keratinize and lose their cilia, making them vulnerable to infection.The RNI for adult vitamin A in China is 800ug retinol activity equivalent per day for males and 700ug retinol activity equivalent per day for females.

The food that contains vitamin A much has the liver of fowl, animal, egg yolk, milk powder, carotene can become vitamin A inside small intestine mucous membrane, red yellow reach dark green vegetable, carotene is much contained in fruit.