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L-Cysteine

CAS No.: 52-90-4
Molecule Formula: C3H7NO2S
Molecule Weight: 121.16
Structure Formula:

Description:white crystal or white powdery .
Manufacture Standards:USP, AJI
Specification:

Test items

Specification (AJI)

Specification (USP25)

Appearance

white crystal or white powdery

Identification

tested by Infrared absorption spectrometer

Specific rotation

+8.3°- +9.5°

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Solubility

≥ 95.0%

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Chlorine content

≤ 0.04%

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Ammonium salt (NH4 )

≤ 0.02%

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Sulfate radical (SO4 )

≤ 0.030%

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Ferric salt (Fe)

≤ 10PPm

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Heavy metal (Pb)

≤ 10PPm

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Arsenic salt (As2O3)

≤ 1PPm

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Other amino acids

conforms

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Loss on drying

≤ 0.5%

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Residue on Ignition (sulfated)

≤ 0.1%

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Assay

98.0-101.0%

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pH

4.5-5.5

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Organic volatile matter And organic impurities

---

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Packaging and storage: 25kg/drum, lined with double-layer film bag; Stored in a sealed container, and kept at room temperature.

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