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L-Tyrosine
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L-Tyrosine
(S)-2-Amino-3-(4-hydroxyohenyl) propionic acid |
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C9H11NO3: 181.19 |
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CAS No.60-18-4 |
Nitrogen: 7.73% |
| L-Tyrosine, when dried, contains not less than 98.5 percent and not more
than101.0 percent of L-Tyrosine (C9H11NO3). |
| Description: |
White crystals or crystalline powder; tasteless.
Freely soluble in formic acid, very slightly soluble in water,
practically insoluble in ethanol and in either.Dissolves in
dilute hydrochloric acid and in dilute nitric acid.
Solubility (H2O, g/100g):
0.038(20˚C), 0.075(40˚C), 0.15(60˚C) |
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Identification:
|
Compare the infrared absorption spectrum of the sample with that of the
standard by potassium bromide disc method.
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| Specifications: |
| Item |
Limit |
| Specific rotation [α]
20D |
-11.3˚ to –12.1˚ |
|
State of solution
(Transmittance) |
Clear
and colorless
Not less than 98.0% |
| 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 |
| Arsenic (As2O3) |
Not more than 1PPm |
| Other amino acids |
conforms |
| Loss on drying |
Not more than 0.20% |
|
Residue on ignition
(Sulfated) |
Not more than 0.10% |
| Assay |
99.0 to 101.0% |
| PH |
5.0 to 6.5 |
☆☆☆
Recommended storage limit and condition: Preserved in tight
containers at controlled room temperature (1 year). |
