L-Cystine Property

Melting point:

>240 °C (dec.) (lit.)

alpha 

-224 º(c=2 in 1M HCl)

Boiling point:

468.2±45.0 °C(Predicted)

Density 

1.68

refractive index 

-222.5 ° (C=1, 1mol/L HCl)

storage temp. 

2-8°C

solubility 

1 M HCl: 100 mg/mL

form 

Powder/Solid

pka

1.0, 2.1, 8.02, 8.71(at 25℃)

color 

White

PH

4.60

optical activity

[α]20/D 219±5°, c = 1% in 1 M HCl

Water Solubility 

0.112 g/L (25 ºC)

Merck 

14,2782

BRN 

1728094

Stability:

Stable. Incompatible with strong oxidizing agents.

InChIKey

LEVWYRKDKASIDU-IMJSIDKUSA-N

LogP

0.773 (est)

CAS DataBase Reference

56-89-3(CAS DataBase Reference)

NIST Chemistry Reference

L-Cystine(56-89-3)

EPA Substance Registry System

L-Cystine (56-89-3)

Safety

Hazard Codes 

Xi,Xn

Risk Statements 

36/37/38-22

Safety Statements 

26-36-24/25

RIDADR 

2811

WGK Germany 

3

RTECS 

HA2690000

Hazard Note 

Irritant

TSCA 

Yes

PackingGroup 

III

HS Code 

29309014

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H315Causes skin irritation

H319Causes serious eye irritation

H335May cause respiratory irritation

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P271Use only outdoors or in a well-ventilated area.

P280Wear protective gloves/protective clothing/eye protection/face protection.

L-Cystine Chemical Properties,Usage,Production

Description

L-cystine (formula: (SCH2CH(NH2) CO2H)2), the L-form of cystine) is a covalently linked dimeric nonessential amino acid formed through the oxidation of cysteine. It is contained in many foods including eggs, meat, dairy products, and whole grains as well as in skin and hairs. L-cystine and L-methionine are the amino-acids required for wound healing and formation of epithelial tissue. It is able to stimulate the hematopoietic system and promote the formation of white and red blood cells. It can also be used as a component of parental and enteral nutrition. It can also be used for the treatment of dermatitis and protection of liver function. L-cystine is manufactured through the enzymatic conversion from DL-amino thiazoline carboxylic acid.

References

http://www.ajiaminoscience.com/products/manufactured_products/l-amino_acids/L-Cystine.aspx
https://pubchem.ncbi.nlm.nih.gov/compound/L-cystine#section=Pharmacology
https://en.wikipedia.org/wiki/Cystine

Chemical Properties

A white or almost white, crystalline powder, practically insoluble in water and in alcohol.

Uses

L-Cystine is used as an antioxidant, protecting tissues against radiation and pollution. It finds application in protein synthesis. It is required for utilization of vitamin B6 and is useful in healing burns and wounds. It is also is required by certain malignant cell lines in the culture medium as well as for the growth of certain micro-organisms. It is useful in the stimulation of hematopoietic system and promotes the formation of white and red blood cells. It is an active ingredient in medications used to treat dermatitis.

Uses

L-Cystine has been used in in vitro cystine solubility assay to identify potential drugs that influence cystine solubility. It is also used as a supplement of phosphate-buffered saline to slice and wash periprosthetic tissues.

Uses

L-Cystine is a non-essential amino acid for human development. L-Cystine is formed by the dimerization of two cysteines through the sulfur.

Definition

ChEBI: L-cystine is the L-enantiomer of the sulfur-containing amino acid cystine. It has a role as a flour treatment agent, a human metabolite, a Saccharomyces cerevisiae metabolite, a mouse metabolite and an EC 1.2.1.11 (aspartate-semialdehyde dehydrogenase) inhibitor. It is a cystine, a L-cysteine derivative and a non-proteinogenic L-alpha-amino acid. It is a conjugate acid of a L-cystine anion. It is an enantiomer of a D-cystine. It is a tautomer of a L-cystine zwitterion.

General Description

This Standard Reference Material (SRM) is intended primarily for use in validating microchemical procedures for the determination of carbon, hydrogen, nitrogen, and sulfur in organic matter. SRM 143d is pure crystalline cystine supplied in a 2 g unit size. For more information, please refer to the SDS and COA.

SRM 143D_cert SRM 143D _SDS

Biochem/physiol Actions

Cysteine is the source of disulfide linkages in proteins and has a role in sulfur transport. It undergoes rapid oxidation to form cystine at physiological pH. L-cystine is crucial for oxygen production and low density lipoprotein modification by arterial smooth muscle cells. It also has a role in the synthesis of glutathione.

Safety Profile

Low toxicity by ingestion. When heated to decomposition it emits toxic fumes of PO, and SOx

Purification Methods

Cystine disulfoxide impurity is removed by treating an aqueous suspension with H2S. The cystine is filtered off, washed with distilled water and dried at 100o under a vacuum over P2O5. Crystallise it by dissolving in 1.5M HCl, then adjusting to neutral pH with ammonia. Likely impurities are D-cystine, meso-cystine and tyrosine. Also purify it by dissolving it in 10% NH3 and adding gradually dilute AcOH until the point of precipitation and cooling slowly [Dughton & Harrison Acta Cryst 12 396, 402 1959.] Alternatively dissolve it in 6N NH4OH and evaporate it at room temperature for crystallisation to occur. [Chaney & Steinrauf Acta Cryst 30 711 1974, Beilstein 4 IV 3155.]