L-Cysteine
City: LV, Marupe
Please avoid sudden changes in temperature and humidity, as they may affect the condition of derivative ingredients and tablets.
The shelf life begins from the date of manufacture at the factory.
Taking into account logistical and transportation stages, the remaining shelf life of the product is always shorter than the full shelf life.
We ship products to our customers with a remaining shelf life of no less than 70%.
Physical & Chemical Characteristics
Analysis Item | Specification | Result |
Characters, Appearance | White Crystals or crystalline powder | White Crystals |
Identification | Infrared absorption | Conform |
Specific rotation [α]D20 | +8.3° to +9.5° | +8.81° |
State of solution (Transmittance) | Clear and colorless ≥98.0% | 99.5% |
Chloride (Cl) | NMT 0.1% | <0.1% |
Ammonium (NH4) | NMT 0.02% | <0.02% |
Sulfate (SO4) | NMT 0.028% | <0.028% |
Other amino acids | Conforms | Conform |
Loss on drying | NMT 0.5% | 0.13% |
Residue on ignition (sulfated) | NMT 0.2% | 0.04% |
Assay | NLT 98.0% and NMT 101.0% | 99.54% |
pH | 4.5–5.5 | 5.25 |
Heavy Metals
Analysis Item | Specification | Result |
Iron (Fe) | NMT 10 ppm | <10 ppm |
Lead | NMT 0.5 ppm | <0.5 ppm |
Arsenic | NMT 0.5 ppm | <0.5 ppm |
Cadmium | NMT 0.5 ppm | <0.5 ppm |
Mercury | NMT 0.1 ppm | <0.1 ppm |
Heavy metals (as Pb) | NMT 10 ppm | <10 ppm |
Microbiological Tests
Analysis Item | Specification | Result |
Total Aerobic Microbial Count | NMT 1000 cfu/g | <1000 cfu/g |
Molds and Yeasts Count | NMT 100 cfu/g | <100 cfu/g |
Coliform bacteria | Negative/10 g | Negative |
Salmonella sp. | Negative/10 g | Negative |
Staphylococcus aureus | Negative/10 g | Negative |
Packaging & Storage
Packaging |
|
Storage | Keep container dry and tightly closed; keep in a cool & well ventilated place; keep away from heat and oxidizing agents. |
Shelf life | Recommend usage within 3 years. |