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Arabic Bulgarian Chinese Croatian Czech Danish Dutch English Estonian Finnish French German Greek Hebrew Hindi Hungarian Icelandic Indonesian Italian Japanese Korean Latvian Lithuanian Malagasy Norwegian Persian Polish Portuguese Romanian Russian Serbian Slovak Slovenian Spanish Swedish Thai Turkish Vietnamese

Definition and meaning of Vitamin_E

Definition

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Wikipedia

Vitamin E

Izvor: Wikipedia

Skoči na: orijentacija, traži

Vitamin E predstavljaju u mastima topljivi tokoferoli koji u organizmu djeluju kao jako dobri antioksidansi. Nedostatak vitamina E vrlo je rijedak jer je taj vitamin vrlo široko zastupljen u hrani. Nalazi se u svim tkivima u organizmu, a najviše ga je u jetri, masnom tkivu i mišićima.

Poznato je osam tokoferola (svi su alkoholi) sa aktivnošću vitamina E dok se najvažnijim smatra α-tokoferol koji čini 90% tokoferola u životinjskim tkivima i pokazuje značajnu biološku aktivnost. α-Tokoferol je derivat kromana s izoprenoidnim pobočnim lancem. Ono je zelenkastožuto viskozno ulje koje je netopivo u vodi, a topivo u alkoholu i biljnim uljima. Vitamin E nije dobro držati uz plastiku jer se veže za nju što bi izazvalo razne probleme.

Tokoferoli su u pravilu vrlo rasprostranjeni u hrani. Bogati izvor vitamina E su biljna ulja posebno suncokretovo, sjemenke, bademi, kikiriki, jaja i dr. Preporučene dnevne količine su za odraslu ženu 8 mg, a za odraslog zdravog muškarca su 10 mg.

Kao antioksidans vitamin E spriječava oksidaciju nezasićenih masnih kiselina (membranskih lipida) te reagira sa slobodnim radikalima.

Nedostatak ovog vitamina je vrlo rijedak, a može se pojaviti jedino nakon iscrpljenosti i neadekvatneprehrane koja traje mjesecima. Pošto djeluje na krvotok i prokrvljenost tkiva, uvriježeno je mišljenje da vitamin E djeluje kao prirodni afrodizijak. Kod dugotrajnog uzimanja većih količina mogu nastupiti poteškoće sa vidom. Međutim, poznato je da prekomjerne količine vitamina E ne uzrokuju veća oštećenja.

 

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