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| L-Cystine |
| Molecular
formula:C6H12N2O4S2
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| CAS NO.56-89-3 |
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| Description: |
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| White crystals or crystalline
powder, tasteless. |
| Specifications: |
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| Item\Specification |
AJI92 |
USP24 |
FCC4 |
| Assay |
98.5 ~ 101.0% |
98.5 ~
101.0% |
98.5 ~ 101.0% |
| PH |
5.0 ~ 6.5 |
|
|
| Specific
rotation[a]D20º |
-21.5º~ -22.5º |
-21.5º~ -22.5º |
-21.5º~
-22.5º |
| Transmittance
(T430) |
≥98.0% |
|
|
| Chloride(CL) |
≤0.020% |
≤0.020% |
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| Ammonium(NH4) |
≤0.02% |
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| Sulfate(SO4) |
≤0.020% |
≤0.020% |
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| Iron(Fe) |
≤20ppm |
≤20ppm |
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| Heavy metals |
≤10ppm |
≤15ppm |
≤0.002% |
| Arsenic |
≤1ppm(
AS2O3) |
≤1ppm(As) |
|
| Other amino acids |
|
|
≤10mg/kg |
| Loss on drying |
Conforms |
Not detected by
TLC |
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| Residue on ignition |
≤0.20% |
≤0.20% |
≤0.20% |
| Organic volatile
impurities |
≤0.10% |
≤0.10% |
≤0.10% |
| |
| Package: |
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| Fiber drum double polyethylene
bags inside (20/25kgs). |
| Storage: |
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| Cool, dry, dark in closed
containers, recommended limit 1 years. |
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