L-Methionine

Test item

specifications

Assay

98.5% to 101.5%

Identification

Infrared absorption

Specific rotation

+22.4° to +24.7°

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5.6 to 6.1

Loss on drying

Not more than 0.3%

Residue on ignition

Not more than 0.4%

Sulfate

Not more than 0.03%

Iron

Not more than 0.003%

Heavy metals

Not more than 0.0015%

Chromatograc purity

Not more than 0.5% of any individual impurity is found, and not more than 2.0% of total impurities is found

Organic volatile impurities

Meets the requirements

Chloride

Not more than 0.05%