definição e significado de Alpha-Tocopherol | sensagent.com


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Definição e significado de Alpha-Tocopherol

Definição

alpha-Tocopherol (n.)

1.(MeSH)A natural tocopherol and one of the most potent antioxidant tocopherols. It exhibits antioxidant activity by virtue of the phenolic hydrogen on the 2H-1-benzopyran-6-ol nucleus. It has four methyl groups on the 6-chromanol nucleus. The natural d form of alpha-tocopherol is more active than its synthetic dl-alpha-tocopherol racemic mixture.

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Dicionario analógico

alpha-Tocopherol (n.) [MeSH]

Abortosan, Adisseo Brand of Tocopherol, Alcala Brand of Tocopherol Acetate, Aliud Brand of Tocopherol, Antioxidans E-Hevert, Aquasol E, Arkopharma Brand of Tocopherol Acetate, AstraZeneca Brand of Tocopherol Acetate, Atarost Brand of Tocopherol Acetate, Auxina E, Balkanpharma Brand of Tocopherol, Biocur Brand of Tocopherol Acetate, Bio E, Biopto-E, Biosan, Bioweyxin, Blackmores Brand of Tocopherol, Bottger Brand of Tocopherol Acetate, Cambridge Laboratories Brand of Tocopherol Actetate, Davitamon, Dermorelle, Detulin, Ecoro, Elex Verla, Embial, E-Mulsin, Ephynal, Eplonat, Equivit E, EUNOVA Vitamin E, Eu Rho Brand of Tocopherol, Eusovit, E-Vicotrat, Evion, Evit, E Vitamin E, E-Vitamin-ratiopharm, Geneva Brand of Tocopherol, GNR-Pharma Brand of Tocopherol Actetate, Grace Brand of Tocopherol, Grunwalder Brand of Tocopherol, Hervert Brand of Tocopherol Acetate, Heyl Brand of Tocopherol Acetate, Hydrovit E, ICN Brand of Tocopherol Acetate, Infirmarius-Rovit Brand of Tocopherol, Internation Animal Health Brand of Tocopherol Acetate, Jenapharm Brand of Tocopherol, Kentucky Brand of Tocopherol, Kohler Brand of Tocopherol, Lasar, Malton E, medphano Brand of Tocopherol Acetate, Merck Brand of Tocopherol Acetate, mibe Brand of Tocopherol Acetate, Micorvit E, MIP Brand of Tocopherol Acetate, Mowivit Vitamin E, Mucos Brand of Tocopherol Acetate, Organon Brand of Tocopherol Acetate, Pharma 2000 Brand of Tocopherol Acetate, Puncto E, ratiopharm Brand of Tocopherol, ratiopharm Brand of Tocopherol Acetate, Richelet Brand of Tocopherol Acetate, Richtavit E, Riemser Brand of Tocopherol, Roche Nicholas Brand of Tocopherol Acetate, Rodisma-Med Brand of Tocopherol, Sanavitan S, Sanum-Kehlbeck Brand of Tocopherol Actetate, Schein Brand of Tocopherol, Schwarzhaupt Brand of Tocopherol Acetate, Sciencex Brand of Tocopherol Acetate, Scot-Tussin Brand of Tocopherol Acetate, Snow-E Muscle, Energy&Feritility, Spondyvit, Stadapharm Brand of Tocopherol, Strathmann Brand of Tocopherol, Tocolion, Tocopa, Tocopharm, Tocopherol Bayer;Bayer Brand of Tocopherol Acetate;Tocovital;Steigerwald Brand of Tocopherol Acetate;Toco;Tocopherol, Tocopherols, Togal Brand of Tocopherol, Togasan Vitamin E, Troyapharm, Twardy Brand of Tocopherol, Unique E, Uno-Vit, Verla Brand of Tocopherol, Vetsearch Brand of Tocopherol Succinate, Veyx Brand of Tocopherol, Vibolex, Vit. E Stada, Vita-E, Vitagutt Vitamin E, Vitamin E AL, Vitamine E, Vitamine E GNR, Vitamin-E EVI-MIRACLE, Vitamin E-mp, Vitamin E Natur, Vitamin E Sanum, Vitamin E Suspension, Vita-Plus E, Vitazell, Vit E hydrosol, White-E, Wiedemann Brand of Tocopherol, Wiedemann Brand of Tocopherol Succinate, Woelm Brand of Tocopherol Acetate, Worwag Brand of Tocopherol[Hyper.]


Wikipedia

alpha-Tocopherol

                   
α-Tocopherol[1]
IUPAC name

(2R)-2,5,7,8-Tetramethyl-2-[(4R,8R)-(4,8,12-trimethyltridecyl)]-6-chromanol
Identifiers
CAS number 59-02-9 YesY
PubChem 14985
ChemSpider 14265 YesY
UNII N9PR3490H9 YesY
EC number 200-412-2
DrugBank DB00163
ChEBI CHEBI:18145 YesY
ChEMBL CHEMBL47 YesY
ATC code A11HA03
Jmol-3D images Image 1
Image 2
Properties
Molecular formula C29H50O2
Molar mass 430.71 g/mol
Density 0.950 g/cm³
Melting point

2.5–3.5 °C
Boiling point

200–220 °C at 0.1 mmHg
 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

α-Tocopherol is a type of tocopherol or vitamin E. It has E number "E307".

α-Tocopherol is a form of vitamin E that is preferentially absorbed and accumulated in humans.[2] The measurement of "vitamin E" activity in international units (IU) was based on fertility enhancement by the prevention of spontaneous abortions in pregnant rats relative to alpha-tocopherol.

There are three stereocenters in alpha-tocopherol, so this is a chiral molecule.[3] The eight stereoisomers of alpha-tocopherol differ in the arrangement of groups around these stereocenters. In the image of RRR-alpha-tocopherol, all three stereocenters are in the R form. However, if the middle of the three stereocenters were changed (so the hydrogen was now pointing down and the methyl group pointing up), this would become the structure of RSR-alpha-tocopherol. RSR-alpha-tocopherol and RRR-alpha-tocopherol are diastereomers of each other. These stereoisomers can also be named in an alternative older nomenclature, where the stereocenters are either in the d or l form.[4]

1 IU of tocopherol is defined as ⅔ milligrams of RRR-alpha-tocopherol (formerly named d-alpha-tocopherol or sometimes ddd-alpha-tocopherol). 1 IU is also defined as 1 milligram of an equal mix of the eight stereoisomers, which is a racemic mixture called all-rac-alpha-tocopheryl acetate. This mix of stereoisomers is often called dl-alpha-tocopheryl acetate, even though it is more precisely dl,dl,dl-alpha-tocopheryl acetate). However, 1 IU of this racemic mixture is not now considered equivalent to 1 IU of natural (RRR) α-tocopherol, and the Institute of Medicine and the USDA now convert IU's of the racemic mixture to milligrams of equivalent RRR using 1 IU racemic mixture = 0.45 "milligrams α-tocopherol".[5]

  References

  1. ^ Merck Index, 11th Edition, 9931.
  2. ^ Rigotti A (2007). "Absorption, transport, and tissue delivery of vitamin E". Mol. Aspects Med. 28 (5–6): 423–36. doi:10.1016/j.mam.2007.01.002. PMID 17320165. 
  3. ^ Jensen SK, Lauridsen C (2007). "Alpha-tocopherol stereoisomers". Vitam. Horm. 76: 281–308. doi:10.1016/S0083-6729(07)76010-7. PMID 17628178. 
  4. ^ Brigelius-Flohé R, Traber MG (1 July 1999). "Vitamin E: function and metabolism". FASEB J. 13 (10): 1145–55. PMID 10385606. http://www.fasebj.org/cgi/pmidlookup?view=long&pmid=10385606. 
  5. ^ Composition of Foods Raw, Processed, Prepared USDA National Nutrient Database for Standard Reference, Release 20 USDA, February 2008
         
Fat soluble
Water soluble
Combinations

M: NUT

cof, enz, met

drug(A8/11/12)
   
   
Retrieved from "http://en.wikipedia.org/w/index.php?title=Alpha-Tocopherol&oldid=470088758"
           

This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)

 

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