| 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 | — |
cysteine
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