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Vitamin E 99% CAS NO 59-02-9 

  产品分类 : 化學->化學用品->冷卻水處理藥劑

     
Vitamin E 99% CAS NO 59-02-9
         

  产品规格
 
Model No:    cy59-02-9
  Country  CN
  Brand  cy
  Packing  20kg
  Minimum Order  20
  Payment Term  L/C

 

  产品描述
   
  <p>
α-Tocopherol is a type of tocopherol or vitamin E. It has E number "E307".
</p>
<p>
α-Tocopherol is a form of vitamin E that is preferentially absorbed and accumulated in humans. 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.
</p>
<p>
There are three stereocenters in alpha-tocopherol, so this is a chiral molecule. 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.
</p>
<p>
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".
</p>
<p>
<br />
</p>
<p>
Natural vitamin E
</p>
<p>
Chinese alias: vitamin E; D- alpha tocopherol; D-ALPHA- tocopherol; vitamin E; synthetic VE oil;
</p>
<p>
English Name: (+) - alpha -tocopherol
</p>
<p>
English aliases: (+) - alpha-Tocopherol; D-alpha-Tocopherol; 2H-1-Benzopyran-6-ol, 3,4-dihydro-2,5,7,8-tetramethyl-2-(4,8,12-trimethyltridecyl) - [2R-[2R* (4R*, 8R*)]-(+) -tocopherol;
</p>
<p>
CAS: 59-02-9
</p>
<p>
Molecular formula: C29H50O2
</p>
<p>
Molecular weight: 430.70600
</p>
<p>
Precise quality: 430.38100
</p>
<p>
PSA:29.46000
</p>
<p>
LogP:8.84020
</p>
<p>
Physicochemical properties
</p>
<p>
Appearance and character: transparent yellow oil.
</p>
<p>
Density: 0.93
</p>
<p>
Melting point: 2.5-3.5 C
</p>
<p>
Boiling point: 200-220 C (0.07501 mmHg)
</p>
<p>
Flash point: 253 x C
</p>
<p>
Refractive index: n20/D 1.505 (lit.)
</p>
<p>
Stability: Stable. Combustible. May be sensitive to light and air. Incompatible with strong oxidizing agents.
</p>
<p>
Storage conditions: 2-8 C
</p>
<p>
Steam pressure: 4.59E-10mmHg at 25 degree C
</p>
<p>
security information
</p>
<p>
Customs Code: 2936280000
</p>
<p>
WGK Germany:1
</p>
<p>
Danger category code: R36/37/38
</p>
<p>
Safety instructions: S23-S24/25
</p>
<p>
RTECS: DJ2900000
</p>
<p>
Dangerous goods sign: Xi
</p>
<p>
purpose
</p>
<p>
Pharmaceutical raw materials, food additives, cosmetics additives, raw materials for animal feed.
</p>
<p>
<br />
</p>chenyichem.com

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