L- type has the bitter taste, the DL- and the D- type have little sweet taste. 289 °C decompounds,slightly soluble in water, does not dissolve in the ethyl alcohol;Dissolves in the diluted acid or the diluted alkali, the long time illumination will color up; heat together with water can produce the water a small amount of indole, like when heat up under the sodium hydroxide, the cupric sulfate existence, then will produce massive indole; heats up with the acid in the hidden place will be more stable; when coexist with Medicine bulk drugs, carbohydrate, and aldehyde, it is extremely easy to decompose.
1. For nutrition of pregnant woman;
2. For the treatment of anxiety, pellagra;
3. For anticonvulsant, stomach secretion regulator, stomach lining protecting agent;
4. As sedative, etc ;
|
Item |
Specification |
Result |
|
Appearance |
White to slightly yellowish white crystals or crystalline powder |
White crystalline powder |
|
Identification |
Infrared Absorption: Positive |
Positive |
|
Specific rotation[α]D20 |
-29.4°~ -32.8° |
-31.4° |
|
pH (1%) |
5.5~7.0 |
5.8 |
|
Loss on drying |
NMT 0.3% |
0.15% |
|
Residue on ignition |
NMT 0.1% |
0.04% |
|
Chloride |
NMT 0.05% |
<0.05% |
|
Sulfate |
NMT 0.03% |
<0.03% |
|
Iron |
NMT 0.003% |
<0.003% |
|
Heavy metals (as Pb) |
NMT 0.0015% |
<0.0015% |
|
Arsenic |
NMT 1ppm |
<1ppm |
|
Hg |
NMT 1ppm |
< 1ppm |
|
Cd |
NMT 1ppm |
< 1ppm |
|
Organic volatile impurity |
Meet the requirements |
Conforms |
|
Assay |
98.5~101.5% (on dried basis) |
99.5% |
|
Solubility |
||
|
Hydrochloric acid dilute |
Soluble |
Conforms |
|
Hot alcohol |
Soluble |
Conforms |
|
Total plate counts: |
<1000cfu/g |
Conforms |
|
Yeasts & Molds: |
<100cfu/g |
Conforms |
|
E.coli |
negative/g |
Conforms |
|
Salmonella |
negative/g |
Conforms |
