| Item |
STANDARD |
| Identification, (IR) |
Positive |
| Assay (C3H7NO2) ,%(on dried basis) |
99.0~101.0 |
| Specific rotation |
+14.3°~ +15.° |
| State of solution, % |
98.0 |
| Chloride(as Cl),% |
=<0.020 |
| Ammonium (as NH4),% |
=<0.02 |
| Sulphate (as SO4),% |
=<0.020 |
| Iron(as Fe), ppm |
=<10 |
| Heavy metals (as Pb), ppm |
=<10 |
| Arsenic(as As2O3), ppm |
=<1 |
| Other amino acids |
Meets the requirements |
| Loss on drying, % |
=<0.20 |
| Residue on ignition(as sulphated ash), % |
=<0.10 |
| pH value (1.0g/20mL water) |
5.7~6.7 |
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