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L-Threonine
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L-Threonine
(2S, 3R)-2-Amino-3-hydroxybutyric acid |
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C4H9NO3: 119.12 |
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CAS No.72-19-5 |
Nitrogen: 11.76% |
| L-Threonine, when dried, contains not less than 98.5 percent and not more
than101.0 percent of L-Threonine (C4H9NO3). |
| Description: |
White crystals or crystalline powder; slightly sweet taste.
Freely soluble in formic acid, soluble in water, practically
insoluble in ethanol and in either.
Solubility (H2O, g/100g):
9.00(20˚C), 12.2(40˚C), 19.0(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.
|
| Specifications: |
| Item |
Limit |
| Specific rotation [α]
20D |
-27.6˚ to –29.0˚ |
|
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 |
5.2 to 6.2 |
☆☆☆
Recommended storage limit and condition: Preserved in tight
containers at controlled room temperature (2 year). |
