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L-Cysteine CAS Number: 52-90-4
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| Post Date: | May 29,2013 |
| Expiry Date: | May 29,2014 |
| Detailed Description: |
Cas No. :52-90-4
Quantity: 20Metric Tons Specs:99.0% to 101.0% Payment Method: TT/LC L-Cysteine CAS Number: 52-90-4 (R)-2-Amino-3 -mercaptopropionic Acid Food Grade Amino Acids L-Cysteine C3H7NO2S L-Cysteine Abbreviation: L-Cys CAS Number: 52-90-4 Chemical Name: (R)-2-Amino-3 -mercaptopropionic Acid Chemical Formula: C3H7NO2S Molecular Weight: 121.1600 Solubility: Freely soluble in water Property: White crystals or crystalline powder; characteristic taste L-cysteine is recognized as a conditionally essential amino acid. Under normal physiologic conditions, the body can produce sufficient levels of L-cysteine. However, preterm infants cannot synthesize L-cysteine in the body; therefore it must be obtained via the diet. Applications: Cysteine, mainly the L-enantiomer, is a precursor in the food, pharmaceutical, and personal care industries. One of the largest applications is the production of flavors. For example, the reaction of cysteine with sugars in a Maillard reaction yields meat flavors.L-cysteine is also used as aprocessing aid for baking. In the field of personal care, cysteine is used for permanent wave applications predominantly in Asia. Again the cysteine is used for breaking up the disulfide bonds in the hair's keratin. Cysteine is a very popular target for site-directed labeling experiments to investigate biomolecular structure and dynamics. Maleimides will selectively attach to cysteine using a covalent Michael addition. Site-directed spin labeling for EPR or paramagnetic relaxation enhanced NMR also uses cysteine extensively. In a 1994 report released by five top cigarette companies, cysteine is one of the 599 additives to cigarettes. Like most cigarette additives, however, its use or purpose is unknown.[22] Its inclusion in cigarettes could offer two benefits: Acting as an expectorant, since smoking increases mucus production in the lungs; and increasing the beneficial antioxidant glutathione (which is diminished in smokers). Specifications: Item Specification( AJI92) Results Identification Infrared absorption Conforms Stata of solution (transmittance) Clear and colorless Not less than 95.0% 99% Specific rotation [α]D20 +8.3°to +9.5° +9.1° Chloride(Cl) Not more than 0.04% Not more than 0.04% Ammonium (NH4) Not more than 0.02% Not more than 0.02% Sulfate(SO4) Not more than 0.030% Not more than 0.030% Iron(Fe) Not more than 10ppm Not more than 5ppm Arsenic (As2O3) Not more than 1ppm Not more than 1ppm Other amino acids Chromatographically Not detectable Conforms Heavy metals(Pb) Not more than 10ppm Not more than 5ppm Loss on drying Not more than 0.50% 0.2% Residue on ignition (sulfated) Not more than 0.10% 0.05% Assay 99.0% to 101.0% 99.7% PH 4.5 to 5.5 4.7 |
| CAS Registry Number: | 52-90-4 |
| Synonyms: | ;Cysteine, L-;L-(+)-Cysteine;L-Alanine, 3-mercapto-;L-Cys;NSC 8746;L-Cysteine;(+)-2-Amino-3-mercaptopropionic acid;L-beta-mercaptoalanine;L-Cysteine Free Base Crystalline;(S)-(-)-Cysteine;L-Cysteine Base;H-Cys-OH; |
| Molecular Formula: | C3H7NO2S |
| Molecular Weight: | 121.15 |
| Molecular Structure: | 
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| Hazard Symbols: |  Xn:Harmful; |
| Risk Codes: | R22:; R36/37/38:; |
| Safety Description: | S26:; S37/39:; |
| Company: | Yuancheng Pharmaceutical Co., Ltd Hubei [ China ] |
| Contact: | Lupin |
| Tel: | +862768886724 |
| Fax: | +862788048077-899 |
| Email: | ycgsales02@ycphar.com |
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