Vitamine A
Tanga mu magambo make
Vitamine A irimo vitamine A1 na A2. Vitamine A1 na A2 bisa mu miterere) Retinol ishobora gukorwa muri beta-carotene ikomoka ku bimera. Mu gihe cyo gukusanya β-carotene-15, 15'-peroxide (biooxygenase) mu mubiri, β-carotene ishobora guhinduka molekile ebyiri za retinaldehyde (ratinal), na retinaldehyde muri reductase. Igabanuka ikaba retinol bitewe n'ibikorwa bya. Kubwibyo, beta-carotene izwi kandi nka vitamine A.
Imiterere y'ibinyabutabire
Vitamine A ni ifu y'umuhondo ifite uduce duto cyangwa kristu, idashonga mu mazi na glycerine, kandi ishonga mu bintu byinshi bikomoka ku bimera nka alcool, ether, hydrocarbon na halogenated hydrocarbons. Izina ry'umubiri wa vitamine A - retinol ni all-trance 3,7-dimethyl-9-(2,6,6-trimethyl-1-cyclohexene-1)-2,4,6,8-nontetraene-1-ol, ifite imigozi ine ifatanye ku ruhande rwayo.
Imikorere n'ingaruka z'imikorere y'umubiri
Vitamine A ni vitamine ishongeshwa n'ibinure, kandi imikorere yayo ishingiye ahanini kuri aside retinoic. Carotene ni isoko y'ingenzi ya vitamine A. Vitamine A ikora cyane muri carotene ni beta-carotene. Igipimo cyo kwinjiza mu mara y'umuntu ni kimwe cya gatandatu cy'icya vitamine A. Vitamine A ibikwa cyane mu mwijima mu mubiri, ikaba ingana na 90% kugeza 95% by'ingano yose, naho ingano nto ikabikwa mu mavuta. Vitamine A igira uruhare runini mu mikorere y'umubiri w'umuntu.
