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Fitamin A

Fitamin A
Enghraifft o'r canlynolgroup of chemical entities Edit this on Wikidata
Mathfitamin, retinoid Edit this on Wikidata
Rhan ovitamin A metabolic process, cellular response to vitamin A, vitamin A import, response to vitamin A, vitamin A biosynthetic process, vitamin A transport Edit this on Wikidata
Tudalen Comin Ffeiliau perthnasol ar Gomin Wicimedia
Dyma strwythyr retinol, sef ffurf mwya cyffredin fitamin A, (o ran diet)

Teulu o foleciwlau (y retinoids) gyda siap tebyg iawn iddynt ydyw Fitamin A (hefyd retinol).

O ran bwydydd anifeiliaid, mae'r ffurf mwyaf cyffredin o'r fitamin hwn yn ester ('retinyl palimitate' fel arfer) neu asid retonig. Mae pob ffurf o'r fitamin yn cynnwys cylch Beta-ioned ('Beta Ionone' yn Saesneg); atodir ar y cylch cadwyn isoprenoid sy'n hanfodol i fitaminau weithio'n iawn. Mae Beta-carotine yn llawn o fitamin A.

Darganfyddwyd fitamin A rhwng 1906 a 1917 yn Unol Daleithiau America. Fe wnaed y ffurf synthetig yn 1947 yn yr Iseldiroedd.

Bwydydd sy'n cynnwys fitamin A

[golygu | golygu cod]

Mae fitamin A i'w gael yn y bwydydd canlynol:

  • iau (cig eidion, porc, cyw iâr, twrci, pysgodyn) (6500 μg 722%)
  • moron (835 μg 93%)
  • dail brocoli (800 μg 89%)
  • tatws melys (709 μg 79%)
  • bresych bras (681 μg 76%)
  • menyn (684 μg 76%)
  • sbigoglys (469 μg 52%)
  • dail gwyrdd
  • pwmpen (369 μg 41%)
  • bresych llyfnddail (333 μg 37%)
  • melon cantaloupe (169 μg 19%)
  • wyau ieir (140 μg 16%)
  • bricyll (96 μg 11%)
  • papaya (55 μg 6%)
  • mango (38 μg 4%)
  • pŷs (38 μg 4%)
  • brocoli (31 μg 3%)
  • gwrdiau
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Fitamin A
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