Chemical Properties of Cystine (CAS 56-89-3)

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-/m1/s1

InChI Key

LEVWYRKDKASIDU-QWWZWVQMSA-N

Formula

C6H12N2O4S2

SMILES

NC(CSSCC(N)C(=O)O)C(=O)O

Molecular Weight¹

240.30

CAS

56-89-3

Other Names

• (-)-Cystine
• (R-(R*,R*))-3,3'-Dithiobis(2-aminopropanoic acid)
• 3,3'-Dithiobis(2-aminopropanoic acid)
• 3,3'-Dithiobis(2-aminopropionic acid)
• 3,3'-Dithiodialanine
• 3,3'-dithiobis-L-alanine
• Alanine, 3,3'-dithiobis-
• Alanine, 3,3'-dithiodi-
• Bis(«beta»-amino-«beta»-carboxyethyl) disulfide
• Cysteine disulfide
• Cystin
• Cystine acid
• Cystine, L-
• Dicysteine
• L-3,3'-dithiodialanine
• L-Alanine, 3,3'-dithiobis-
• L-Cysteine disulfide
• L-Cystin
• L-cystine
• NSC 13203
• Oxidized L-cysteine
• Propanoic acid, 3,3'-dithiobis(2-amino-, (R-(R*,R*))-
• «beta»,«beta»'-Diamino-«beta»,«beta»'-dicarboxydiethyl disulfide
• «beta»,«beta»'-Dithiobisalanine
• «beta»,«beta»'-Dithiodialanine

• Δ_cH°_solid : Standard solid enthalpy of combustion (kJ/mol).
• C_p,gas : Ideal gas heat capacity (J/mol×K).
• C_p,solid : Solid phase heat capacity (J/mol×K).
• Δ_fH°_gas : Enthalpy of formation at standard conditions (kJ/mol).
• Δ_fH°_solid : Solid phase enthalpy of formation at standard conditions (kJ/mol).
• Δ_fusH° : Enthalpy of fusion at standard conditions (kJ/mol).
• IE : Ionization energy (eV).
• log₁₀WS : Log10 of Water solubility in mol/l.
• logP_oct/wat : Octanol/Water partition coefficient.
• McVol : McGowan's characteristic volume (ml/mol).
• S°_{solid,1 bar} : Solid phase molar entropy at standard conditions (J/mol×K).
• T_fus : Normal melting (fusion) point (K).
• ¹: Molecular weight from the IUPAC atomic weights tables.

Physical Properties

Property	Value	Unit	Source
ΔcH°solid	[-4248.00; -4158.20]	kJ/mol
ΔcH°solid	-4248.00 ± 3.80	kJ/mol	NIST
ΔcH°solid	-4230.00 ± 3.80	kJ/mol	NIST
ΔcH°solid	-4201.20	kJ/mol	NIST
ΔcH°solid	-4158.20	kJ/mol	NIST
ΔfH°gas	-737.21	kJ/mol	Relay (1.0) Calculated Property
ΔfH°solid	-1105.00	kJ/mol	NIST
ΔfusH°	43.19	kJ/mol	Joback Calculated Property
IE	8.91	eV	Relay (1.0) Calculated Property
log10WS	-0.85		Relay (1.0) Calculated Property
logPoct/wat	-0.808		Crippen Calculated Property
McVol	162.940	ml/mol	McGowan Calculated Property
S°solid,1 bar	[280.58; 286.60]	J/mol×K
S°solid,1 bar	280.58	J/mol×K	NIST
S°solid,1 bar	286.60	J/mol×K	NIST
Tfus	519.49	K	Relay (1.0) Calculated Property

Cheméo can also estimate Normal Boiling Point Temperature, Critical Temperature, Critical Pressure, Critical Volume, Enthalpy of vaporization at standard conditions, Standard Gibbs free energy of formation, Acentric Factor for this compound, but they fall outside the models' validated range, so they are not shown here. Open the prediction tool to compute them on demand.

Temperature Dependent Properties

Property	Value	Unit	Temperature (K)	Source
Cp,gas	[463.56; 491.43]	J/mol×K	[909.64; 1160.35]
Cp,gas	463.56	J/mol×K	909.64	Joback Calculated Property
Cp,gas	470.06	J/mol×K	951.42	Joback Calculated Property
Cp,gas	475.78	J/mol×K	993.21	Joback Calculated Property
Cp,gas	480.73	J/mol×K	1034.99	Joback Calculated Property
Cp,gas	484.97	J/mol×K	1076.78	Joback Calculated Property
Cp,gas	488.52	J/mol×K	1118.56	Joback Calculated Property
Cp,gas	491.43	J/mol×K	1160.35	Joback Calculated Property
Cp,solid	[261.92; 268.60]	J/mol×K	[297.30; 298.15]
Cp,solid	268.60	J/mol×K	297.30	NIST
Cp,solid	261.92	J/mol×K	298.15	NIST

Similar Compounds

Find more compounds similar to Cystine.

Mixtures

• Sodium perchlorate + Cystine + Water
• Cystine + Water
• Ethanaminium, N,N,N-triethyl-, iodide + Cystine + Water
• TETRAMETHYLAMMONIUM CHLORIDE + Cystine + Water
• sodium chloride + Cystine + Water

Sources

• Cheméo Relay (1.0)
• Cheméo Relay (1.0, beta) Beta: served but experimental, data-limited and below our cross-validation release bar; the Joback value is recommended where available.
• Crippen Method
• Crippen Method
• Solubility and Activity Coefficients of Acidic and Basic Nonelectrolytes in Aqueous Salt Solutions. 1. Solubility and Activity Coefficients of o-Phthalic Acid and L-Cystine in NaCl(aq), (CH3)4NCl(aq), and (C2H5)4NI(aq) at Different Ionic Strengths and at t ) 25 deg C
• Solubility and Acidic Constants of L-Cystine in NaClO4 Aqueous Solutions at 25 deg C
• Joback Method
• McGowan Method
• NIST Webbook

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