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| L-Cysteine |
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| · CAS No.: 52-90-4
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| · Molecule Formula: C3H7NO2S |
| · Molecule Weight: 121.16
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| · Structure Formula: |
·  |
| · Description:white crystal or white powdery
. |
| · Manufacture Standards:USP, AJI
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| · Specification: |
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Test items
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Specification (AJI)
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Specification (USP25)
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Appearance
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white crystal or white powdery
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Identification
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tested by Infrared absorption spectrometer
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Specific rotation
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+8.3°- +9.5°
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---
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Solubility
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≥ 95.0%
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---
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Chlorine content
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≤ 0.04%
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---
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Ammonium salt (NH4 )
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≤ 0.02%
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---
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Sulfate radical (SO4 )
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≤ 0.030%
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---
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Ferric salt (Fe)
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≤ 10PPm
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---
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Heavy metal (Pb)
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≤ 10PPm
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---
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Arsenic salt (As2O3)
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≤ 1PPm
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---
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Other amino acids
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conforms
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---
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Loss on drying
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≤ 0.5%
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---
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Residue on Ignition (sulfated)
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≤ 0.1%
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---
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Assay
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98.0-101.0%
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---
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pH
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4.5-5.5
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---
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Organic volatile matter And organic impurities
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---
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---
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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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