L-Cystine
L-Cystine
CAS NO：56-89-3
| Test Items | Limit |
| Molecular Structure |  |
| Specific rotation | between -215 ° to -225 ° |
| State of Solution | Clarity,Clear and color,not more |
| (Transmittance) | cloured than reference solution Y7 |
| Ammonium(NH4) | |
| Sulfate(SO4) | Max200ppm |
| Iron(Fe) | Max200ppm |
| Heavy metals(Pb) | Max20ppm |
| Arsenic(AS2 O3) | Max10ppm |
| Other amino acids | Max1ppm |
| Loss on drying | Not Detectable |
| Sulphated Ash | Max0.2% |
| Assay | Max 0.1% |
| PH | 98.5%~101.0% 5.0 to 6.5 |
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