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Potassium Hydrogen Aspartate

Potassium Hydrogen Aspartate BP Ph Eur Grade Supplier, Manufacturer's Representative, CAS Number 7259-25-8

CAS number : 7259-25-8
Molecular Weight: 180.2+
Chemical Formula: C4H6KNO4,½H2O

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DESCRIPTION

Potassium Hydrogen Aspartate Hemihydrate BP Grade
Ph Eur
Formula: C4H6KNO4,½H2O
Weight: 180.2+

DEFINITION
Potassium hydrogen (2S)-2-aminobutanedioate hemihydrate.
Content: 99.0 per cent to 101.0 per cent (anhydrous substance).

CHARACTERS
Appearance: White or almost white, powder or crystalline powder, or colourless crystals.
Solubility: Very soluble in water, practically insoluble in alcohol and in methylene chloride.

IDENTIFICATION
A. It complies with the test for specific optical rotation (see Tests).
B. Examine the chromatograms obtained in the test for ninhydrin-positive substances.
Results: The principal spot in the chromatogram obtained with test solution (b) is similar in position, colour and size to the principal spot in the chromatogram obtained with reference solution (a).
C. It gives reaction (b) of potassium (2.3.1).

TESTS
Solution S: Dissolve 2.5 g in carbon dioxide-free water prepared from distilled water and dilute to 100 ml with the same solvent.
Appearance of solution: Solution S is clear and colourless.
pH: 6.0 to 7.5 for solution S.
Specific optical rotation: + 18.0 to + 20.5 (anhydrous substance).
Dissolve 0.50 g in a mixture of equal volumes of hydrochloric acid and water and dilute to 25.0 ml with the same mixture of solvents.
Ninhydrin-positive substances: To pass the test by thin-layer chromatography.
Limits: Test solution (a): any impurity: any spot, apart from the principal spot, is not more intense than the spot in the chromatogram obtained with reference solution (b) (0.5 per cent).
Chlorides: Maximum 200 ppm.
Sulphates: Maximum 500 ppm.
Ammonium: Maximum 200 ppm, determined on 50 mg.
Iron: Maximum 30 ppm.
Heavy metals: Maximum 10 ppm.
Water: 4.0 per cent to 6.0 per cent, determined on 0.200 g.


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