| Appearance |
White to pale yellow powder |
Visual inspection |
| Identification |
Consistent with authenticated reference |
FTIR fingerprint comparison |
| Assay as hydrochloride |
≥98.5% w/w, dry basis |
Amino-acid analysis with external standard |
| Loss on drying |
≤1.0% w/w |
Gravimetry, 105 C to constant mass |
| pH, 10% aqueous solution at 25 C |
5.0-6.0 |
Calibrated pH meter |
| Sulfated ash |
≤0.30% w/w |
Gravimetric sulfated residue |