Loaʻa ka Vitamin C i ka pale ʻana a me ka mālama ʻana i ka waikawa ascorbic, no laila ua ʻike ʻia ʻo iaʻakika ascorbica he huaora hiki ke hoʻoheheʻe ʻia i ka wai. Loaʻa ka nui o ka huaora C maoli i loko o nā huaʻai hou (nā ʻāpala, nā ʻalani, nā kiwifruit, a me nā mea ʻē aʻe) a me nā mea kanu (nā ʻōmato, nā kukama, a me ke kāpeti, etc.). Ma muli o ka nele o ka enzyme kī i ka pae hope loa o ka biosynthesis vitamin C i loko o ke kino kanaka, ʻo ia hoʻiL-glucuronic acid 1,4-lactone oxidase (GLO),pono e lawe ʻia ka huaora C mai ka meaʻai.
ʻO ka molecular formula o ka huaora C ʻo C6H8O6, he mea hoʻemi ikaika. ʻO nā pūʻulu enol hydroxyl ʻelua ma ka 2 a me 3 carbon atoms i loko o ka mole e wehe maʻalahi a hoʻokuʻu iā H+, a laila e hoʻoheheʻe ʻia e hana i ka vitamin C dehydrogenated. ʻO ka Vitamin C a me ka vitamin C dehydrogenated e hana i kahi ʻōnaehana redox reversible, e hana ana i nā ʻano antioxidant a me nā hana ʻē aʻe, a e pāʻani ana i kahi kuleana nui i ke kino o ke kanaka. Ke hoʻohana ʻia i ke kahua o nā mea hoʻonaninani, loaʻa ka huaora C i nā hana e like me ke keʻokeʻo a me ka hoʻoulu ʻana i ka hana collagen.
ʻO ka maikaʻi o ka vitamina C
ʻili keʻokeʻo
ʻElua mau mīkini nui e hana aihuaʻai Che hopena keʻokeʻo ma ka ʻili. ʻO ka hana mua ʻo ia ka mea hiki i ka huaora C ke hōʻemi i ka melanin oxygen ʻeleʻele i ka wā o ke kaʻina hana o ka melanin e hōʻemi i ka melanin. Hoʻoholo ʻia ke kala o ka melanin e ke ʻano quinone i loko o ka mole melanin, a ʻo ka huaora C ka waiwai o kahi mea hoʻohaʻahaʻa, hiki ke hōʻemi i ka hana quinone i kahi ʻano phenolic. ʻO ka hana ʻelua, hiki i ka huaora C ke komo i ka metabolism o tyrosine i ke kino, a laila e hōʻemi i ka hoʻololi ʻana o tyrosine i melanin.
antioxidant
ʻO nā radical manuahi nā mea ʻino i hana ʻia e ke kino, nona nā waiwai oxidizing ikaika a hiki ke hōʻino i nā ʻiʻo a me nā cell, e alakaʻi ana i ke ʻano o nā maʻi maʻi.Huaola Che mea hoʻoheheʻe manuahi manuahi e hiki ke hoʻopau i nā radical manuahi e like me - OH, R -, a me O2- i loko o ke kino, e pāʻani ana i kahi kuleana nui i ka hana antioxidant.
Hoʻoikaika i ka hana ʻana o ka collagen
Aia kekahi palapala e hōʻike ana i ka hoʻohana ʻana i kēlā me kēia lā o nā formulations i loaʻa ka 5% L-ascorbic acid i loko o ka ʻili hiki ke hoʻonui i nā pae hōʻike mRNA o ke ʻano I a me ke ʻano III collagen i ka ʻili, a me nā pae hōʻike mRNA o nā ʻano invertases ʻekolu, carboxycollagenase. , aminoprocollagenase, a me ka lysine oxidase e hoʻonui i ka nui like, e hōʻike ana e hiki i ka huaora C ke hāpai i ka synthesis o ka collagen i ka ʻili.
Ka hopena prooxidation
Ma waho aʻe o nā hopena antioxidant, loaʻa i ka huaora C kahi hopena prooxidant i ke alo o nā ion metala, a hiki ke hoʻoulu i ka lipid, protein oxidation, a me ka hōʻino DNA, a laila e hoʻopilikia i ka hōʻike gene. Hiki i ka Vitamin C ke ho'ēmi i ka peroxide (H2O2) i ka radical hydroxyl a hoʻoikaika i ke kūkuluʻiaʻana o ka pōʻino oxidative ma o ka ho'ēmiʻana i ka Fe3 + i Fe2 + a me Cu2 + i Cu +. No laila, ʻaʻole ʻōlelo ʻia e hoʻohui i ka huaora C no ka poʻe me ka nui o ka hao a i ʻole ka poʻe me nā kūlana pathological e pili ana i ka hao e like me ka thalassemia a i ʻole hemochromatosis.
Ka manawa hoʻouna: Apr-10-2023
