52-90-4 C3H7NO2S L-Cysteine CAS NO.52-90-4

l-cysteine basic information

product name:	l-cysteine
synonyms:	(r)-2-amino-3-mercaptopropanoic acid;3-mercapto-l-alanin;alpha-amino-beta-mercaptopropionicacid;alpha-amino-beta-thiolpropionic acid;alpha-amino-beta-thiolpropionicacid;cystein;half-cysteine;l-alanine, 3-mercapto-
cas:	52-90-4
mf:	c3h7no2s
mw:	121.16
einecs:	200-158-2
product categories:	api intermediates;cysteine [cys, c];amino acids;amino acids and derivatives;alpha-amino acids;antioxidant;biochemistry;nutritional supplements;l-amino acids;amino acids;amino
mol file:	52-90-4.mol

l-cysteine chemical properties

mp	220 °c (dec.)(lit.)
alpha	8.75 º (c=12, 2n hcl)
fema	3263
refractive index	8.8 ° (c=8, 1mol/l hcl)
storage temp.	store at rt.
solubility	h2o: 25 mg/ml
water solubility	280 g/l (25 ºc)
sensitive	air sensitive
merck	14,2781
brn	1721408
stability:	stability stable, but may be air sensitive. incompatible with oxidizing agents, bases.
cas database reference	52-90-4(cas database reference)
nist chemistry reference	l-cysteine(52-90-4)
epa substance registry system	l-cysteine(52-90-4)

safety information

hazard codes	xn,xi
risk statements	22-36/37/38-20/21/22
safety statements	36-37/39-26
wgk germany	3
rtecs	ha1600000
f	10-23
hs code	29309012
hazardous substances data	52-90-4(hazardous substances data)

msds information

l-cysteine usage and synthesis

chemical properties	white crystalline powder
usage	l-cysteine is a non-essential amino acid that can be synthesized by the human body under normal physiological conditions if a sufficient quantity of methionine is available. l-cysteine is commonly use d as a precursor in the food and pharmaceutical industries. l-cysteine is used as a processing aid for baking, as an additive in cigarettes, as well as in the preparation of meat flavours.

l-cysteine preparation products and raw materials

raw materials	ammonium hydroxide-->hydrogen sulfide-->α-protein-->l-cystine-->tin granular
preparation products	6-bromomethyl-pteridine-2,4-diamine hbr-->n-acetyl-cysteine-->l-cysteine hydrochloride anhydrous-->ranitidine hydrochloride-->l-cysteine hydrochloride monohydrate-->d-biotin-->carbocistein-->chiral 2，2-disubstituted thiaprolinol derivatives-->papain-->s-carboxymethyl-l-cysteine

hennan sunlake enterprise corporation is located in henan province , the central plain of china , which enjoys favorable geogeaphical position and convenient transportion, the com[any was established in june. 1998 , until now having more than 18 years experience in manufacturing & exporting chemical raw material .

sunlake is a professional manufacturer engaged in producing and selling chemicals,including organic & inorganic chemicals , pigments & dyestuffs , water treatment chemicals , food & feed additives and others . these products have been being well exported to europe , southeast asia , the middle east , africa , south america and some other countries and areas.

we sincerely welcome foreign friends to visit our plant for cooperation. with the idea of "quality first,credit priority, excellent service", we are highly acknowledged by customers for good quality and competitive price. more importantly , the company has a strong r & d team, who are professional engineers and scholars with ph. d. .so we are confident to serve you better with our high - quality products and professional team.

we are taking great efforts to provide our customers with demanded goods and professional services, and continuously improve our core ability of competition and get the momentum for sustainable development, and finally make us being a reliable and professional wupplier in international market. we welcome any serious inquiries from all customers of the world, and sincerely hope to cooperate with you for a brilliant future!