| Item | Specifications |
| USP | AJI |
| Appearance | White crystals or crystalline powder; strongly acid taste. |
| Identification | Infrared Absorption | --- |
| Specific optical rotation | +5.6 °- +8.9 ° | +5.5 °- +7.0 ° |
| State of solution (Transmittance) | --- | >= 98.0% clear and colorless |
| Chloride (Cl) | --- | 19.89-20.29% |
| Ammonium(NH4) | --- | =< 0. 002% |
| Sulfate | =< 0. 03 % | =< 0. 020% |
| Iron | =< 0. 003 % | 10ppm |
| Heavy Metals (as Pb), | =< 0.00 15% | =< 10ppm |
| Arsenic (as As), | --- | =< 1ppm |
| Other amino acids | --- | Not detected |
| Organic volatile impurities | Meets the requirement | --- |
| Loss on drying, | 8-12 % | 8.5-12 % |
| Residue on ignition, | c | =< 0.1 0 % |
| Assay | 98.5-101.5 % | 9 9.0-10 0.5 % |
| pH value | --- | 1.5-2.0 |
| Organic volatile impurities | Meets the requirement | --- |
| Chromatographic purity | 0.5% max Individual impurity, 2% max total | --- |