3D model (JSmol)
|E number||E307a (antioxidants, ...)|
CompTox Dashboard (EPA)
|Molar mass||430.71 g/mol|
|Appearance||yellow-brown viscous liquid|
|Melting point||2.5 to 3.5 °C (36.5 to 38.3 °F; 275.6 to 276.6 K)|
|Boiling point||200 to 220 °C (392 to 428 °F; 473 to 493 K) at 0.1 mmHg|
|NFPA 704 (fire diamond)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
α-Tocopherol is a type of vitamin E. It has E number "E307". Vitamin E exists in eight different forms, four tocopherols and four tocotrienols. All feature a chromane ring, with a hydroxyl group that can donate a hydrogen atom to reduce free radicals and a hydrophobic side chain which allows for penetration into biological membranes. Compared to the others, α-tocopherol is preferentially absorbed and accumulated in humans.
Vitamin E is found in a variety of tissues, being lipid-soluble, and taken up by the body in a wide variety of ways. The most prevalent form, α-tocopherol, is involved in molecular, cellular, biochemical processes closely related to overall lipoprotein and lipid homeostasis. Ongoing research is believed to be "critical for manipulation of vitamin E homeostasis in a variety of oxidative stress-related disease conditions in humans." One of these disease conditions is the α-tocopherol role in the use by malaria parasites to protect themselves from the highly oxidative environment in erythrocytes.
α-Tocopherol has three stereocenters, so it is a chiral molecule. The eight stereoisomers of α-tocopherol differ in the configuration of these stereocenters. RRR-α-tocopherol is the natural one. The older name of RRR-α-tocopherol is d-α-tocopherol, but this d/l naming should be no longer used, because whether l-α-tocopherol should mean SSS enantiomer or the SRR diastereomer is not clear, from historical reasons. The SRR may be named 2-epi-α-tocopherol, the diastereomeric mixture of RRR-α-tocopherol and 2-epi-α-tocopherol may be called 2-ambo-α-tocopherol (formerly named dl-α-tocopherol). The mixture of all eight diastereomers is called all-rac-α-tocopherol
One IU of tocopherol is defined as ⅔ milligram of RRR-α-tocopherol (formerly named d-α-tocopherol, or sometimes ddd-α-tocopherol). 1 IU is also defined as 1 mg of an equal mix of the eight stereoisomers, which is a racemic mixture, all-rac-α-tocopheryl acetate. This mix of stereoisomers is often called dl-α-tocopheryl acetate. However, 1 IU of this mixture of diastereomers is not now considered equivalent to 1 IU of natural RRR-α-tocopherol, and the Institute of Medicine and the USDA now convert IUs of the racemic mixture to milligrams of equivalent RRR using 1 IU racemic mixture = 0.45mg "α-tocopherol".
- Merck Index, 11th Edition, 9931.
- Rigotti A (2007). "Absorption, transport, and tissue delivery of vitamin E". Molecular Aspects of Medicine. 28 (5–6): 423–36. doi:10.1016/j.mam.2007.01.002. PMID 17320165.
- Shichiri M, Ishida N, Hagihara Y, Yoshida Y, Kume A, Suzuki H (2019). "Probucol induces the generation of lipid peroxidation products in erythrocytes and plasma of male cynomolgus macaques". Journal of Clinical Biochemistry and Nutrition. 64 (2): 129–142. doi:10.3164/jcbn.18-7. PMC 6436040. PMID 30936625.
- Jensen SK, Lauridsen C (2007). "Alpha-tocopherol stereoisomers". Vitamins and Hormones. 76: 281–308. doi:10.1016/S0083-6729(07)76010-7. PMID 17628178.
- Brigelius-Flohé R, Traber MG (July 1999). "Vitamin E: function and metabolism". FASEB Journal. 13 (10): 1145–55. doi:10.1096/fasebj.13.10.1145. PMID 10385606.
- IUPAC Nomenclature of Tocopherols and Related Compounds
- "Composition of Foods Raw, Processed, Prepared USDA National Nutrient Database for Standard Reference, Release 20" (PDF). USDA. February 2008. Archived from the original (PDF) on 2012-02-19.