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L-Tryptophan

CAS No.: 73-22-3
Molecular formular: C11H12N2O2
Molecular weight: 204.23
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Product description
Parameters

L-Tryptophan

AJI92

USP40

EP6.0

Description

White to yellowish white crystals or crystalline powder

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White or almost white,crystalline or amorphous powder

Identification

Conform

Conform

Conform

Solubility

/

/

Sparingly soluble in water, slightly soluble in ethanol(96 percent). It dissolves in dilute solutions of mineral acids and alkali hydroxides.

Appearance of solution

/

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The solution is clear and not more intensively coloured than reference solution BY6

Assay

98.5%~100.5%

98.5%~101.5%

98.5%~101.0%

pH

5.4~6.4

5.5~7.0

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Transmittance

≥95.0%

/

/

Loss on drying

≤0.20%

≤0.3%

≤0.5%

Residue on ignition

≤0.10%

≤0.1%

≤0.1%

Chloride

≤0.020%

≤0.05%

≤200ppm

Heavy Metals

≤10ppm

≤15ppm

≤10ppm

Iron

≤20ppm

≤30ppm

≤20ppm

Sulfate

≤0.020%

≤0.03%

≤300ppm

Ninhydrin-positive substances  (TLC)

/

/

Conform

Arsenic

≤1ppm

/

/

Ammonium

≤0.02%

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≤200ppm

Other amino acids

Meet the requirements

/

/

Pyrongen

Conform

/

/

Specific Rotation

-30.0° ~ -32.5°

-29.4°~ -32.8°

-30.0°~-33.0°

Organic impurities

/

Conforms

/

 

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