| Appearance |
white or practically white, crystalline powder, having a slight, characteristic odor |
| Solubility |
freely soluble in water; slightly soluble in alcohol; insoluble in chloroform and in ether.
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| Identification |
a) Infrared Absorption b) Dissolve 10 mg in 5 mL of water, and add 1 drop of 5 N sodium hydroxide and 20 mg of ninhydrin: a blue or violet-blue color is produced immediately.
c) Dissolve 20 mg in 4 mL of water, add 2 mL of phosphotungstic acid solution (1 in 10), and heat nearly to boiling: a deep blue color is produced immediately |
| Specific rotation | between 60.5 and 64.5 |
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| pH | between 4.5 and 5.5, in a solution |
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| Loss on drying | Dry about 100 mg, accurately weighed, in a capillary-stoppered bottle in vacuum at a pressure not exceeding 5 mm of mercury at 60 for 3 hours |
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| Residue on ignition | not more than 0.1% |
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| Heavy metals | not more than 0.002% |
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| Assay | not less than 97.0% and not more than 102.0% |
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| 1)calculated on the dried basis |
