L-Valine

USP24

EP6.0

Description

White crystals or crystalline powder, Slightly bitter taste

White or almost white, crystalline powder or  colourless crystals.

Solubility

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Soluble in water,very slightly soluble in alcohol

Identification

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Conform

Appearance of solution

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Clarity of solution:2.5% water solution should be clear.

Colour of solution:2.5% water solution should be not more intensively coloured than reference solution BY6.

Specific rotation

+26.6°~ +28.8°

+26.5° ~ +29.0°

Assay

98.5%~101.5%

98.5%~101.0%

pH

5.5~7.0

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Chloride(Cl)

≤0.05%

≤200ppm

Sulfate

≤0.03%

≤300ppm

Ammonium

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≤200ppm

Iron(Fe)

≤30ppm

≤10ppm

Arsenic (As)

≤1.5ppm

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Heavy metals(Pb)

≤15ppm

≤10ppm

Loss on drying

≤0.30%

≤0.50%

Residue on ignition

≤0.10%

≤0.10%

Ninhydrin-positive

≤100CFU/g

Conform

Organic volatile impurities

Conforms

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