Vitamin E b? vitamin na-enwegh? isi na enwegh? ?t? na-enwegh? isi na ab?ba soluble nke nwere antioxidant, anticancer, mgbochi mkpali na ?r? nd? ?z?. D? ka ihe owuwu ya si d?, enwere ike kewaa ya ?z? ab??: tocopherols na tocotrienols. A na-ekewa ?d? ? b?la n'?d? an? dabere na ?n?d? methyl na mgbanaka chromophore: alfa, beta, gamma, na delta [1-2]. Ngwak?ta nd? met?tara tocopherols, d? ka tocotrienols, nwere ?r? ?f?d? mgbe ihe nn?chi anya d? iche, mana ?r? nke tocopherols na-ebelata nke ukwuu.

Ma tocopherol na tocotrienol nwere mmet?ta antioxidant siri ike. N'ihi ?r? nke alfa tocopherol transfer protein (alpha TP) na tocopherol binding protein (TBP) n'ime ah?, tocopherol na-etinye ya ngwa ngwa ma jiri ya mee ihe. Ya mere, a na-ewere alfa tocopherol d? ka isi ngosip?ta nke ?r? antioxidant nke vitamin E na ah?. Alfa tocopherol, nke nwere usoro molek?la nke C29H50O2 na ?d? ar? nke 430.5, kewara ?z? ab?? dabere na isi iyi ya: eke na s?ntetik, nke akp?r? D-?d? na ?d? L, n'otu n'otu. Natural alpha tocopherol d? na R conformation (RRR), mgbe artificially synthesized alpha tocopherol d? na RS conformation (RRR, RSR, RRS, RSS, SRR, SSR, SRS, SSS). Nkwek?r?ta ah? met?tara ?r? ya, ?m?m? ach?p?tala na ? b? naan? alfa tocopherol nwere 2R ma ? b? kar?a nwere ike itinye n'?r? ma tinye ya n'ah?. Ya mere, alfa tocopherol eke nwere uru oriri na-edozi ah? d? elu ma d?kwa nchebe kar?a alfa tocopherol nke ar?p?tara na artificially.