Vitamin A (particle)
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| Post Date: | Sep 25,2018 |
| Expiry Date: | Sep 25,2019 |
| Detailed Description: |
Cas No. :68-26-8;11103-57-4
Quantity: 1000Metric Tons Specs:25kg/bag Price:1 USD Metric Tons Payment Method: TT; L/C; CASH AND SO ON Vitamin A is a group of unsaturated nutritional organic compounds that includes retinol, retinal, retinoic acid, and several provitamin A carotenoids (most notably beta-carotene).[1][2] Vitamin A has multiple functions: it is important for growth and development, for the maintenance of the immune system and good vision.[3][4] Vitamin A 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[5] necessary for both low-light (scotopic vision) and color vision.[6] Vitamin A 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.[4][7] In foods of animal origin, the major form of vitamin A is an ester, primarily retinyl palmitate, which is converted to retinol (chemically an alcohol) in the small intestine. The retinol form functions as a storage form of the vitamin, and can be converted to and from its visually active aldehyde form, retinal. All forms of vitamin A have a beta-ionone ring to which an isoprenoid chain is attached, called a retinyl group.[1] Both structural features are essential for vitamin activity.[8] The orange pigment of carrots (beta-carotene) can be represented as two connected retinyl groups, which are used in the body to contribute to vitamin A levels. Alpha-carotene and gamma-carotene also have a single retinyl group, which give them some vitamin activity. None of the other carotenes have vitamin activity. The carotenoid beta-cryptoxanthin possesses an ionone group and has vitamin activity in humans. Vitamin A can be found in two principal forms in foods: Retinol, the form of vitamin A absorbed when eating animal food sources, is a yellow, fat-soluble substance. Since the pure alcohol form is unstable, the vitamin is found in tissues in a form of retinyl ester. It is also commercially produced and administered as esters such as retinyl acetate or palmitate.[9] The carotenes alpha-carotene, beta-carotene, gamma-carotene; and the xanthophyll beta-cryptoxanthin (all of which contain beta-ionone rings), but no other carotenoids, function as provitamin A in herbivores and omnivore animals, which possess the enzyme beta-carotene 15,15'-dioxygenase which cleaves beta-carotene in the intestinal mucosa and converts it to retinol.[10] |
| CAS Registry Number: | 68-26-8;11103-57-4 |
| Synonyms: | ;2,4,6,8-nonatetraen-1-ol, 3,7-dimethyl-9-(2,6,6-trimethyl-1-cyclohexen-1-yl)-, (all-E)-;3,7-dimethyl-9-(2,6,6-trimethyl-1-cyclohexen-1-yl)-2,4,6,8-nonatetraen-1-ol;ACON;afaxin;agiolan;Alphalin;all-trans-retinyl alcohol;all-trans-retinol;all-trans-vitamin a alcohol;anatola;anatola a;anti-infective vitamin;antixerophthalmic vitamin;Aoral;apexol;apostavit;aquasynth;alphasterol;Atars;ATAV;avibon;Avita;avitol;axerol;axerophthol;biosterol;disatabs tabs;chocola a;dofsol;dohyfral a;epiteliol;hi-a-vita;lard factor;nio-a-let;oleovitamin a;ophthalamin;prepalin;Retinol;retrovitamin a;testavol;trans-retinol;vaflol;Vafol;VI-alpha;Vitamin A1;Vitamin A1 alcohol;Vitamin A alcohol;vitavel a;vitpex;Vogan;vogan-neu;;ROIDEX;Vitamin A Retinol;3,7-Dimethyl-9-(2,6,6-trimethyl-1-cyclohexenyl)-nona-2,4,6,8-tetraen-1-ol;Aquasol A;retinol; |
| Molecular Formula: | C20H30O |
| Molecular Weight: | 286.4516 |
| Molecular Structure: | 
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| Company: | Hebei RM Healthcare Company Limited [ China ] |
| Contact: | Mary |
| Tel: | +86-0311-89624628 |
| Fax: | +86-0311-84951873 |
| Email: | wanmin.jiang@hebeirm.com |
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