Vitamini C imakhala ndi mphamvu yoteteza ndi kuchiza ascorbic acid, chifukwa chake imadziwikanso kutiascorbic asidindipo ndi vitamini wosungunuka m'madzi. Vitamini C wachilengedwe amapezeka mu zipatso zatsopano (maapulo, malalanje, kiwifruit, etc.) ndi masamba (tomato, nkhaka, kabichi, etc.). Chifukwa cha kusowa kwa enzyme yofunika mu gawo lomaliza la vitamini C biosynthesis m'thupi la munthu, ndiyeL-glucuronic acid 1,4-lactone oxidase (GLO),vitamini C iyenera kutengedwa kuchokera ku chakudya.
Maselo a vitamini C ndi C6H8O6, omwe ndi ochepetsetsa kwambiri. Magulu awiri a enol hydroxyl pa 2 ndi 3 maatomu a carbon mu molekyulu amalekanitsidwa mosavuta ndi kumasula H +, potero oxidizing kupanga dehydrogenated vitamini C. Vitamini C ndi dehydrogenated vitamini C amapanga redox dongosolo redox, kuchita zosiyanasiyana antioxidant ndi ntchito zina, ndi kuchita mbali yofunika kwambiri mu thupi la munthu. Akagwiritsidwa ntchito kumunda wa zodzoladzola, vitamini C ali ndi ntchito monga kuyera ndi kulimbikitsa mapangidwe a collagen.
Mphamvu ya vitamini C
kuyera khungu
Pali njira ziwiri zazikulu zomwe zimagwiritsidwa ntchitovitamini Cali ndi whitening kwambiri pakhungu. Njira yoyamba ndi yakuti vitamini C imatha kuchepetsa mdima wa melanin wa okosijeni panthawi yopanga melanin kuti achepetse melanin. Mtundu wa melanin umatsimikiziridwa ndi kapangidwe ka quinone mu molekyulu ya melanin, ndipo vitamini C imakhala ndi chinthu chochepetsera, chomwe chingachepetse mawonekedwe a quinone kukhala phenolic. Njira yachiwiri ndikuti vitamini C imatha kutenga nawo gawo mu metabolism ya tyrosine m'thupi, potero kuchepetsa kutembenuka kwa tyrosine kukhala melanin.
antioxidant
Ma radicals aulere ndi zinthu zovulaza zomwe zimapangidwa ndi zomwe thupi limachita, zomwe zimakhala ndi oxidizing amphamvu ndipo zimatha kuwononga minyewa ndi ma cell, zomwe zimapangitsa kuti pakhale matenda osatha.Vitamini Cndi madzi osungunuka aulere omwe amatha kuchotsa ma radicals aulere monga - OH, R -, ndi O2- m'thupi, akugwira ntchito yofunikira mu ntchito ya antioxidant.
Limbikitsani kaphatikizidwe ka collagen
Pali zolemba zomwe zikuwonetsa kuti tsiku lililonse kugwiritsa ntchito mankhwala okhala ndi 5% L-ascorbic acid pakhungu kumatha kukulitsa mawonekedwe a mRNA amtundu wa I ndi mtundu wa III wa collagen pakhungu, komanso kuchuluka kwa mawu a mRNA amitundu itatu ya invertase, carboxycollagenase, aminoprocollagenase, ndi lysine oxidase komanso kulimbikitsa kuphatikizika kwa khungu la vitamini C.
Mphamvu ya prooxidation
Kuphatikiza pa antioxidant zotsatira, vitamini C imakhalanso ndi mphamvu ya prooxidant pamaso pa ayoni achitsulo, ndipo imatha kuyambitsa lipid, protein oxidation, ndi kuwonongeka kwa DNA, potero kumakhudza mawonekedwe a jini. Vitamini C imatha kuchepetsa peroxide (H2O2) ku hydroxyl radical ndikulimbikitsa mapangidwe a kuwonongeka kwa okosijeni mwa kuchepetsa Fe3 + mpaka Fe2 + ndi Cu2 + ku Cu +. Chifukwa chake, sikulimbikitsidwa kuwonjezera vitamini C kwa anthu omwe ali ndi iron yambiri kapena omwe ali ndi matenda okhudzana ndi chitsulo chochulukirapo monga thalassemia kapena hemochromatosis.
Nthawi yotumiza: Apr-10-2023
