Vitamin C nwere mmetụta nke igbochi na ịgwọ ascorbic acid, ya mere a na-akpọkwa yaascorbic acidna ọ bụ vitamin soluble mmiri. A na-achọta vitamin C eke eke na mkpụrụ osisi ọhụrụ (apples, oranges, kiwifruit, wdg) na akwụkwọ nri (tomato, kukumba, na kabeeji, wdg). N'ihi enweghị isi enzyme na ikpeazụ nzọụkwụ nke vitamin C biosynthesis na ahụ mmadụ, ya bụL-glucuronic acid 1,4-lactone oxidase (GLO),A ghaghị iwere vitamin C na nri.
Usoro ihe omimi nke vitamin C bụ C6H8O6, nke bụ ihe na-ebelata ike. The abụọ enol hydroxyl otu na 2 na 3 carbon atoms na molekul na-adị mfe dissociated na hapụ H +, si otú oxidizing na-etolite dehydrogenated vitamin C. Vitamin C na dehydrogenated vitamin C na-etolite reversible redox usoro, na-arụ ọrụ dị iche iche antioxidant na ndị ọzọ ọrụ, na. na-ekere òkè dị mkpa na ahụ mmadụ. Mgbe etinyere ya na ngalaba ịchọ mma, vitamin C nwere ọrụ dị ka ịcha ọcha na ịkwalite nhazi collagen.
Mmetụta nke vitamin C
akpụkpọ anụ
E nwere isi ụzọ abụọ nkevitamin Cnwere mmetụta na-acha ọcha na akpụkpọ ahụ. Usoro nke mbụ bụ na vitamin C nwere ike ibelata melanin oxygen gbara ọchịchịrị n'oge usoro mmepụta nke melanin iji belata melanin. A na-ekpebi agba nke melanin site na nhazi quinone dị na melanin molecule, na vitamin C nwere ihe onwunwe nke onye na-ebelata ihe, nke nwere ike ibelata nhazi quinone na nhazi phenolic. Usoro nke abụọ bụ na vitamin C nwere ike itinye aka na metabolism nke tyrosine n'ime ahụ, si otú ahụ belata ngbanwe nke tyrosine na melanin.
antioxidant
Free radicals bụ ihe na-emerụ ahụ nke mmeghachi omume anụ ahụ na-emepụta, nke nwere ihe ndị na-emepụta ihe na-eme ka ọ dị ike ma nwee ike imebi anụ ahụ na sel, na-eduga n'ọtụtụ ọrịa na-adịghị ala ala.Vitamin Cbụ onye na-eme ihe na-eme ka mmiri na-agbaze nke nwere ike iwepụ ihe ndị na-akpata free radicals dị ka - OH, R -, na O2- n'ime ahụ, na-arụ ọrụ dị mkpa na ọrụ antioxidant.
Na-akwalite njikọ nke collagen
Enwere akwụkwọ na-egosi na ntinye akwụkwọ kwa ụbọchị nke usoro nwere 5% L-ascorbic acid na akpụkpọ ahụ nwere ike ịbawanye ọkwa mRNA nke ụdị I na ụdị III collagen na akpụkpọ ahụ, yana ọkwa mRNA nke ụdị invertases atọ, carboxycollagenase. , aminoprocollagenase, na lysine oxidase na-abawanye ruo n'ókè yiri nke ahụ, na-egosi na vitamin C nwere ike ịkwalite njikọ nke collagen na akpụkpọ ahụ.
Mmetụta prooxidation
Na mgbakwunye na mmetụta antioxidant, vitamin C nwekwara mmetụta prooxidant na ọnụnọ nke ion ígwè, ma nwee ike ime ka lipid, protein oxidation, na DNA mebiri emebi, si otú ahụ na-emetụta mkpụrụ ndụ ihe nketa. Vitamin C nwere ike ibelata peroxide (H2O2) ka ọ bụrụ hydroxyl radical ma kwalite nguzobe nke mmebi oxidative site n'ibelata Fe3 + na Fe2 + na Cu2 + na Cu +. Ya mere, a naghị atụ aro ka ịgbakwunye vitamin C maka ndị nwere nnukwu ígwè ma ọ bụ ndị nwere ọrịa ọrịa metụtara oke ígwè dị ka thalassaemia ma ọ bụ hemochromatosis.
Oge nzipu: Eprel-10-2023
