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56-89-3

Basic Information
CAS No.: 56-89-3
Name: L-Cystine
Article Data: 312
Cas Database
Molecular Structure:
Molecular Structure of 56-89-3 (L-Cystine)
Formula: C6H12N2O4S2
Molecular Weight: 240.304
Synonyms: 查看更多英文别名"> L-Cystine;1-cystine;L-CYSTINE;l-cystin;h-(cys);(H-Cys-OH)2;(R,R)-3,3'-Dithiobis(2-aminopropionicacid);Cystin;[3H]-Cystine;(CYS)2;.β.,.β.'-Diamino-.β.,.β.'-dicarboxydiethyl disulfide;(R,R)-cystine;Nephrin;Dicysteine;L-CYTISINE;查看更多英文别名
EINECS: 200-296-3
Density: 1.571 g/cm3
Melting Point: >240 °C (dec.)(lit.)
Boiling Point: 468.2 °C at 760 mmHg
Flash Point: 237 °C
Solubility: 0.112 g/L (25 °C) in water
Appearance: White crystalline powder
Hazard Symbols: IrritantXi
Risk Codes: 36/37/38
Safety: 26-36-24/25
Transport Information: N/A
PSA: 177.24000
LogP: 0.59220
Synthetic route
52-90-4

L-Cysteine

56-89-3

L-cystine

Conditions
ConditionsYield
With 3-bromo-2-(1-hydroxycyclohexyl)[1,2]selenazolo[2,3-a]pyridinium chloride; dihydrogen peroxide In methanol; water at 20℃; for 0.166667h;100%
With dihydrogen peroxide; sodium iodide In water at 25℃; for 1h; Cooling with ice;100%
With bis(4-methoxyphenyl)telluride; rose bengal In water; isopropyl alcohol at 0℃; for 0.833333h; Irradiation;99%
52-90-4

L-Cysteine

73243-09-1

(R)-2-Amino-3-(4-methoxy-phenylmethanesulfinyl)-propionic acid

56-89-3

L-cystine

Conditions
ConditionsYield
With dimethylsulfide; trifluorormethanesulfonic acid In trifluoroacetic acid at 0℃; for 1h;100%
84888-38-0

(R)-9H-fluorenyl-9-methyl-L-cysteine

56-89-3

L-cystine

Conditions
ConditionsYield
With piperidine In N,N-dimethyl-formamide for 2h;100%
134469-02-6, 51209-75-7

S-nitroso-L-cysteine

A

56-89-3

L-cystine

B

NO

NO

Conditions
ConditionsYield
With copper(II) ion In water at 25℃; Rate constant; var. conc. of Cu2+;A 100%
B n/a
2481-10-9

(R)-S-tert-butylcysteine

56-89-3

L-cystine

Conditions
ConditionsYield
With Methyltrichlorosilane; 1,1'-sulfinylbisbenzene at 4℃; for 0.166667h;99%
52-90-4

L-Cysteine

75893-05-9

H-Cys(Acm)(O)-OH

56-89-3

L-cystine

Conditions
ConditionsYield
With dimethylsulfide In trifluoroacetic acid at 0℃; for 1h;97.9%
Reaxys ID: 11465027

Reaxys ID: 11465027

56-89-3

L-cystine

Conditions
ConditionsYield
With sodium hydroxide In water at 20 - 60℃; for 2h; pH=~ 4.0;97%
With ammonia In water at 20 - 60℃; for 0.666667 - 2h; pH=~ 3.0;97%
With ammonia In water at 20 - 80℃; for 2h; pH=~ 2.3 - ~ 3.0;95%
52-90-4

L-Cysteine

134861-13-5

N-(benzoylsulfide)benzamide

A

56-89-3

L-cystine

B

55-21-0

benzamide

C

D-N-benzoylcysteine

Conditions
ConditionsYield
In methanol; aq. phosphate buffer at 20℃; pH=7.4;A 95%
B 96%
C 80%
2544-31-2

S-(4-methoxybenzyl)-L-cysteine

56-89-3

L-cystine

Conditions
ConditionsYield
With Methyltrichlorosilane; 1,1'-sulfinylbisbenzene at 4℃; for 0.166667h;95%
With methoxybenzene; thallium(III) trifluoroacetate In trifluoroacetic acid at 0℃; for 1h;86.7%
With methoxybenzene; thallium(III) trifluoroacetate In trifluoroacetic acid at 0℃; for 1h; Product distribution; cleavage various S-protecting groups of cystein;86.7%
19647-70-2

S-acetamidomethyl-L-cysteine

56-89-3

L-cystine

Conditions
ConditionsYield
With Methyltrichlorosilane; 1,1'-sulfinylbisbenzene at 4℃; for 0.5h;93%
With Methyltrichlorosilane; 1,1'-sulfinylbisbenzene at 4℃; for 0.5h; Product distribution; other S-protected cysteines;93%
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Specification

1. Introduction of L-Cystine

L-Cystine, with the IUPAC Name of (2R)-2-amino-3-[(2R)-2-amino-3-hydroxy-3-oxopropyl]disulfanylpropanoic acid, is one kind of white crystalline powder. Stability: For being stable in the normal condition, it is incompatible with strong oxidizing agents, and this chemical belongs to the Product Categories which include Food and Feed Additive; Amino Acids; Amino Acid Derivatives; Cysteine [Cys, C]; Nutritional Supplements; L-Amino Acids; Amino Acids.

2. Properties of L-Cystine

L-Cystine has the following property datas: (1)Melting Point: >240 °C (dec.)(lit.); (2)Surface Tension: 88.2 dyne/cm ; (3)Density: 1.571 g/cm3 ; (4)Flash Point: 237 °C ; (5)Enthalpy of Vaporization: 80.02 kJ/mol ; (6)Boiling Point: 468.2 °C at 760 mmHg ; (7)Vapour Pressure: 4.62E-10 mmHg at 25°C ; (8)Water Solubility: 0.112 g/L (25 °C).

3. Structure Descriptors of L-Cystine

You could convert the following datas into the molecular structure:
InChI: InChI=1S/C6H12N2O4S2/c7-3(5(9)10)1-13-14-2-4(8)6(11)12/h3-4H,1-2,7-8H2,(H,9,10)(H,11,12)/t3-,4-/m0/s1 
InChIKey: InChIKey=LEVWYRKDKASIDU-IMJSIDKUSA-N 
Smiles: C([C@@H](C(O)=O)N)SSC[C@@H](C(O)=O)N

4. Toxicity of L-Cystine

Organism Test Type
Route
Reported Dose (Normalized Dose) Effect Source
mouse LD50 intraperitoneal > 961mg/kg (961mg/kg)   Yakugaku Zasshi. Journal of Pharmacy. Vol. 94, Pg. 1419, 1974.
rat LDLo oral 25gm/kg (25000mg/kg)   Oyo Yakuri. Pharmacometrics. Vol. 15, Pg. 199, 1978.

5. Safety Information of L-Cystine

Hazard Codes: IrritantXi
Risk Statements: 36/37/38 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-36-24/25 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36:Wear suitable protective clothing. 
S24/25:Avoid contact with skin and eyes.
RIDADR: 2811
WGK Germany: 3
RTECS: HA2690000
Hazard Note: Irritant
PackingGroup: III
HS Code: 29309014

6. Use of L-Cystine

Cystine (CAS NO.56-89-3) can be mainly used for various disease alopecia. Also it can be used for dysentery, typhoid, influenza and other acute infectious diseases, asthma, neuralgia, eczema and various diseases, such as poisoning, and protein structure to maintain the role. It is also used as a food flavoring agent.

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