L-Lysine
An amino acid with an additional basic amino group in its side chain.
- Formula
- C6H14N2O2
- Functional group
- Amino acids
- Molar mass
- 146.19 g/mol
- Also known as
- (2S)-2,6-diaminohexanoic acid, lysine, lysine acid, h-Lys-oh, (S)-Lysine, Aminutrin, alpha-Lysine
Overview
An amino acid with an additional basic amino group in its side chain.
The extra nitrogen means its charge cannot be inferred from the alpha-amino and carboxyl groups alone. Lysine can carry a positive side-chain charge in near-neutral aqueous conditions. This is a useful extension of the simple two-group zwitterion model.
Identifiers
- Formula
- C6H14N2O2
- Functional group
- Amino acids
- Molar mass
- 146.19 g/mol
- Also known as
- (2S)-2,6-diaminohexanoic acid, lysine, lysine acid, h-Lys-oh, (S)-Lysine, Aminutrin, alpha-Lysine
Chemical identifiers
- SMILES
- C(CCN)C[C@@H](C(=O)O)N
- InChI
- InChI=1S/C6H14N2O2/c7-4-2-1-3-5(8)6(9)10/h5H,1-4,7-8H2,(H,9,10)/t5-/m0/s1
- PubChem CID
- 5962
Properties
- Melting / decomposition
- 224 °C, decomposes
- Water solubility
- In water, 5.84X10+5 mg/L at 27 °C
Data availability
Not published: Boiling Point, Density.
Related compounds
- Amino acids
An amino acid with an additional basic amino group in its side chain.
References
- PubChem Compound Summary: L-Lysine (CID 5962)National Center for Biotechnology Information · PubChem
Identity, molecular formula, molecular weight and aliases retrieved via PUG REST on 2026-09-08.
- OpenStax Organic Chemistry: Structures of amino acidsJohn McMurry · OpenStax · 2023
Supports the qualitative structural interpretation of the recorded molecular structure; no new physical measurement or verified preparative yield is claimed.
- Hazardous Substances Data Bank (HSDB): L-Lysine — melting pointHazardous Substances Data Bank (HSDB)
Retrieved through PubChem PUG View on 2026-09-08. https://pubchem.ncbi.nlm.nih.gov/compound/5962#section=Melting-Point. Source value, complete property clause or compact miscibility statement retained; absent pressure, temperature or phase conditions are not inferred. Original reference: Lide, D.R. CRC Handbook of Chemistry and Physics 88TH Edition 2007-2008. CRC Press, Taylor & Francis, Boca Raton, FL 2007, p. 3-322
- Hazardous Substances Data Bank (HSDB): L-Lysine — solubilityHazardous Substances Data Bank (HSDB)
Retrieved through PubChem PUG View on 2026-09-08. https://pubchem.ncbi.nlm.nih.gov/compound/5962#section=Solubility. Source value, complete property clause or compact miscibility statement retained; absent pressure, temperature or phase conditions are not inferred. Original reference: Yalkowsky, S.H., He, Yan., Handbook of Aqueous Solubility Data: An Extensive Compilation of Aqueous Solubility Data for Organic Compounds Extracted from the AQUASOL dATAbASE. CRC Press LLC, Boca Raton, FL. 2003., p. 325