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L-Tryptophan
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L-Tryptophan
(S)-2-Amino-3-(3-indolyl) propionic acid |
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C11H12N2O2: 204.23 |
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CAS No.73-22-3 |
Nitrogen: 13.72% |
| L-Tryptophan, when dried, contains not less than 98.5 percent and not
more than101.0 percent of L-Tryptophan (C11H12N2O2) |
| Description: |
White to yellowish white crystals or crystalline powder; slightly bitter
taste.
Freely soluble in formic acid, slightly soluble in water, very
slightly soluble in ethanol, practically soluble in either.
Dissolves in dilute hydrochloric acid.
Solubility (H2O, g/100g):
1.06(20˚C), 1.44(40˚C), 2.05(60˚C) |
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Identification:
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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 |
-30.5˚ to –32.5 |
|
State of solution
(Transmittance) |
Clear
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 |
5.5 to 6.4 |
☆☆☆
Recommended storage limit and condition: Preserved in tight
containers at controlled room temperature (1 year). |
