L-Cysteine CAS NO.52-90-4

Min.Order Quantity:: 100 Kilogram

Purity:: 99.0% to 101.0%

Port:: Shanghai or Shenzhen

Payment Terms:: L/C,D/A,D/P,T/T,MoneyGram,Other

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Product Details

Keywords

L-Cysteine CAS 52-90-4
High quality L-Cysteine
factory price L(+)-Cysteine

Quick Details

ProName: L-Cysteine
CasNo: 52-90-4
Molecular Formula: C3H7NO2S
Appearance: White crystals or crystalline powder
Application: Cysteine, mainly the L-enantiomer, is ...
DeliveryTime: 1 week
PackAge: 25kg/drum
Port: Shanghai or Shenzhen
ProductionCapacity: 25 Metric Ton/Day
Purity: 99.0% to 101.0%
Storage: cool, dry and ventilated place
Transportation: Well packed, during transport please p...
LimitNum: 100 Kilogram
Grade: Food Grade,Pharma Grade

Superiority

iso9001 certified manufacturer

quality: adopting fermentation technology to assure the high quality. no-animal raw material

price: offering the best price during the suppliers in china.

rich material and energe make us control the cost effectively

service: reponse inquiry in 24 hours. fast delivery

certificates:we can offer all kinds of certificates that you need for importing. such as: iso9001, gmp,kosher ,halal etc

Details

description:

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