L-Cysteine 99% | 52-90-4
Product Description:
L-cysteine, an amino acid commonly found in living organisms. It is one of the sulfur-containing α-amino acids. It turns purple (colored due to SH) in the presence of nitroprusside. It exists in many proteins and glutathione. It can form insoluble compounds with metal ions such as Ag+, Hg+, and Cu+. mercaptide. That is, R-S-M', R-S-M"-S-R (M', M" are monovalent and divalent metals, respectively).
Molecular formula C3H7NO2S, molecular weight 121.16. Colorless crystals. Soluble in water, acetic acid and ammonia, insoluble in ether, acetone, ethyl acetate, benzene, carbon disulfide and carbon tetrachloride. It can be oxidized to cystine by air in neutral and weak alkaline solutions.
The efficacy of L-Cysteine 99%:
1. Mainly used in medicine, cosmetics, biochemical research, etc.
2. It is used in bread to promote the formation of gluten, promote fermentation, mold release, and prevent aging.
3. Used in natural juices to prevent oxidation of vitamin C and prevent juice from browning. This product has detoxification effect and can be used for acrylonitrile poisoning and aromatic acid poisoning.
4. This product also has the effect of preventing radiation damage to the human body, and is also a drug for the treatment of bronchitis, especially as a phlegm-relieving drug (mostly used in the form of acetyl L-cysteine methyl ester. Cosmetics are mainly used for beauty Water, perm lotion, sunscreen cream, etc.
Technical indicators of L-Cysteine 99%:
| Analysis Item | Specification |
| Appearance | White crystals powder or crystalline powder |
| Identification | Infrared absorption spectrum |
| Specific rotation[a]D20° | +8.3°~+9.5° |
| State of solution | ≥95.0% |
| Ammonium (NH4) | ≤0.02% |
| Chloride (Cl) | ≤0.1% |
| Sulfate (SO4) | ≤0.030% |
| Iron (Fe) | ≤10ppm |
| Heavy metals (Pb) | ≤10ppm |
| Arsenic | ≤1ppm |
| Loss on drying | ≤0.5% |
| Residue on ignition | ≤0.1% |
| Assay | 98.0~101.0% |
| PH | 4.5~5.5 |
