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Dimethyl Sulfoxide or DMSO or Methylsulfinylmethane or Methyl Sulfoxide USP Analytical Reagent Grade Supplier Exporter Manufacturers' Representative |
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Dimethyl Sulfoxide or DMSO or Methylsulfinylmethane or Methyl Sulfoxide
CAS Number: 67-68-5
Molecular Formula: C2H6OS or (CH3)2SO
Molecular Weight: 78.13
Dimethyl Sulfoxide or DMSO or Methylsulfinylmethane or Methyl Sulfoxide
Specifications of Dimethyl Sulfoxide DMSO USP Grade:
C2H6OS -- 78.13
Methane, sulfinylbis-.
Methyl sulfoxide --- CAS 67-68-5.
Dimethyl Sulfoxide contains not less than 99.9 percent of C2H6OS, calculated on the anhydrous basis.
Identification:
A: Infrared Absorption.
B: Add 1.5 mL cautiously and dropwise to 2.5 mL of hydriodic acid in a test tube cooled in ice. Filter the mixture rapidly and collect the precipitate. Dry the precipitate in vacuum: a deep violet, crystalline solid is obtained, and it is soluble in chloroform, yielding a red solution.
Specific gravity: between 1.095 and 1.101.
Refractive index: between 1.4755 and 1.4775.
Acidity: Dissolve 50.0 g in 100 mL of water and add phenolphthalein. If the solution remains colorless, titrate with 0.01 N sodium hydroxide until a pink color appears: not more than 5.0 mL of 0.01 N sodium hydroxide is consumed.
Water Determination: not more than 0.1%. [ note— Weigh and transfer the test specimen in an environment of low humidity to minimize absorption of atmospheric water.]
Ultraviolet absorbance: Maintain Dimethyl Sulfoxide in a water bath at a temperature of less than 20C [note— Do not freeze.] , and purge with dry nitrogen for 30 minutes. Record the UV absorption spectrum between 270 and 350 nm in a 1-cm cell, using water as the blank: the spectrum is smooth with no absorption maxima; the absorbance at 275 nm is not more than 0.20, and the absorbance ratios, A 285 / A 275 and A 295 / A 275 , at the wavelengths indicated by the subscripts, are not more than 0.65 and 0.45, respectively.
Limit of nonvolatile residue: Evaporate about 100.0 g to dryness in a tared, preconditioned dish on a hot plate under a suitable fume hood. Evaporate gently so boiling does not occur. The weight of the residue does not exceed 0.01%.
Related compounds: To pass the test by chromatography --- not more than 0.1% of total impurities is found.
Specifications of Dimethyl Sulfoxide Analytical Reagent grade:
Methyl Sulfoxide
Sulfinylbismethane
(CH3)2SO --- Formula Weight 78.13
CAS Number 67-68-5
REQUIREMENTS
Appearance: Clear, colorless liquid
Assay: 99.9% (CH3)2SO
MAXIMUM ALLOWABLE
Residue after evaporation: 0.01%
Titrable acid: 0.001 meq/g
Water (H2O): 0.1%
Dimethyl Sulfoxide BP Ph Eur Grade is also supplied:
C2H6OS --- 78.1 --- 67-68-5
Action and use: Pharmaceutical solvent; excipient.
When dimethyl sulphoxide is demanded, Dimethyl Sulfoxide shall be supplied.
DEFINITION
Sulfinylbismethane.
Please visit SDS Safety Data Sheet of Dimethyl Sulfoxide or DMSO or Methylsulfinylmethane or Methyl Sulfoxide Suppliers.
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