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- -tocopherol.
Qhov chaw ntawm Vitamin E
Ntuj vitamin E yog dav faib nyob rau hauv cov ntaub so ntswg, tshwj xeeb tshaj yog nyob rau hauv txiv ntseej, zaub roj thiab zaub. Tocopherols feem ntau yog cov roj zaub ntau dua li tocotrienols (tshwj tsis yog txiv maj phaub roj). Cov noob nplej roj muaj cov ntsiab lus vitamin E siab tshaj plaws thiab cov ntsiab lus siab ntawm -tocopherol. Cov ntsiab lus ntawm tocopherol hauv pob kws roj thiab cov roj taum pauv tsuas yog thib ob ntawm cov roj noob qoob loo, thiab cov ntsiab lus ntawm -tocopherol hauv ob cov roj no siab dua.
Bioactivity ntawm vitamin E
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-alpha Tocopherol is the strongest.
Antioxidant Properties ntawm vitamin E
Vitamin E tuaj yeem siv los ua cov tshuaj tua kab mob antioxidant rau cov roj thiab yog cov khoom lag luam antioxidant zoo rau tib neeg lub cev.
Dawb radicals ua lub luag haujlwm tseem ceeb hauv cov metabolism hauv lub cev ntawm tib neeg lub cev. Vim tias tocopherol muaj ib pawg hydroxyl nquag ntawm lub nplhaib benzene, nws muaj qhov txo qis thiab tuaj yeem muab ib qho hluav taws xob. Thaum cov dawb radicals nkag mus rau theem lipid thiab tau txais cov tshuaj tiv thaiv kab mob, tocopherol tuaj yeem ntes cov dawb radicals, yog li thaiv cov kab mob ntawm cov dawb radicals thiab tiv thaiv lub cev los ntawm oxidation.
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>-tocopherol. Tocotrienols loj dua cov tocopherols sib raug.