|
L-Tyrosine | |
|
Item |
Specification |
|
Appearance |
White crystals or crystalline powder |
|
Specific Rotation[α]D20 |
-11.3° to -12.1° |
|
State of solution |
Clear and colorless |
|
Not less than 95.0% | |
|
Chloride (Cl) |
Not more than 0.020% |
|
Ammonium (NH4) |
Not more than 0.02% |
|
Sulfate (SO4) |
Not more than 0.020% |
|
Iron (Fe) |
Not more than 10ppm |
|
Heavy Metals (Pb) |
Not more than 10ppm |
|
Aresenic (As2O3) |
Not more than 1ppm |
|
Other amino aicds |
Chromatographically not detectable |
|
Loss on drying |
Not more than 0.20% |
|
Residue on ignition |
Not more than 0.10% |
|
Assay |
99.0% to 100.5% |
|
pH |
5.0 to 6.5 |
Pre：L-Thioproline
Next：N-Acetyl-DL-Leucine
