Vitamin E can be divided into natural and synthetic vitamin E. Natural vitamin E has 8 structures, namely , , , δ tocopherol and , , , δ tocotrienols. The biological activity of natural vitamin E is higher than that of artificial synthesis, and the most active is natural D- -tokoferol.
E vitamini manbai
Tabiiy vitamin E o'simlik to'qimalarida, ayniqsa yong'oq, o'simlik moylari va sabzavotlarda keng tarqalgan. Tokoferollar odatda o'simlik moylarida tokotrienollarga qaraganda ancha yuqori (kokos moyidan tashqari). Bugʻdoy urugʻi yogʻida E vitamini eng yuqori va -tokoferol koʻp. Makkajo'xori moyi va soya yog'idagi tokoferol miqdori bug'doy urug'i moyidan keyin ikkinchi o'rinda turadi va bu ikki yog'da -tokoferol miqdori yuqoriroqdir.
E vitaminining bioaktivligi
The structure-activity relationship study of vitamin E shows that the hydroxyl group in the molecule is the active group and must be in para position with the heterocyclic ring atom. The more methyl groups on the benzene ring, the stronger the activity, shortening or removing the side chain in the molecule reduces or disappears the activity. The three-dimensional structure of vitamin E also has an effect on the activity. And the activity of D-alfa tokoferol is the strongest.
E vitaminining antioksidant xususiyatlari
E vitamini yog 'uchun antioksidant sifatida ishlatilishi mumkin va inson tanasi uchun tabiiy va foydali antioksidant mahsulotdir.
Erkin radikallar inson tanasining normal fiziologik metabolizmida muhim rol o'ynaydi. Tokoferol benzol halqasida faol gidroksil guruhiga ega bo'lgani uchun u qaytarilish qobiliyatiga ega va bitta elektronni ta'minlay oladi. Erkin radikallar lipid fazasiga kirib, zanjirli reaksiyaga kirishganda, tokoferol erkin radikallarni tutib oladi va shu bilan erkin radikallarning zanjirli reaksiyasini bloklaydi va organizmni oksidlanishdan himoya qiladi.
The antioxidant properties of various vitamin E are opposite to the strength of physiological activity. The antioxidant properties from strong to weak are: δ-tocopherol>γ-tocopherol>β-tocopherol>-tokoferol. Tokotrienollar tegishli tokoferollardan kattaroqdir.