| Items | Standard GB8245-87 (NY39-1987) |
| Appearance | White or light brown powder, odorless or slight special odor |
| Assay (as C6H14N2O2.HCl on dry basis) | ≧98.5% |
| [a]20D Specific rotation | +18.0°~+ 21.5° |
| Loss on drying | ≤1.0% |
| Residue on Ignition | ≤ 0.3% |
| Ammonium salt | ≤ 0.04% |
| Heavy metal (as Pb) | ≤ 0.003% |
| Arsenic | ≤0.0002% |
