Melting Point of Common Amino Acids
The melting points of amino acids can vary widely depending on their chemical structure. Generally, amino acids have melting points within the range of 200 to 300 °C (392 to 572 °F).
The following table provides a curated list of melting point values for common amino acids at 1 atmospheric (atm) pressure. (1 atm = 101,325 Pa)
Click on the icon to switch between degrees Celsius (°C) and degrees Fahrenheit (°F) units.
| Alanine (Ala) (C3H7NO2) | 250 (sublimes) |
| Arginine (Arg) (C6H14N4O2) | 244 (decomposes) |
| Asparagine (Asn) (C4H8N2O3) | 235 |
| Aspartic Acid (Asp) (C4H7NO4) | 270 |
| Cysteine (Cys) (C3H7NO2S) | 240 (decomposes) |
| Glutamic Acid (Glu) (C5H9NO4) | 224 (decomposes) |
| Glutamine (Gln) (C5H10N2O3) | 185 (decomposes) |
| Glycine (Gly) (C2H5NO2) | 290 (decomposes) |
| Histidine (His) (C6H9N3O2) | 287 (decomposes) |
| Isoleucine (Ile) (C6H13NO2) | 284 (decomposes) |
| Leucine (Leu) (C6H13NO2) | 293 (decomposes) |
| Lysine (Lys) (C6H14N2O2) | 224 (decomposes) |
| Methionine (Met) (C5H11NO2S) | 281 (decomposes) |
| Phenylalanine (Phe) (C9H11NO2) | 92 |
| Proline (Pro) (C5H9NO2) | 220 (decomposes) |
| Serine (Ser) (C3H7NO3) | 228 (decomposes) |
| Threonine (Thr) (C4H9NO3) | 256 (decomposes) |
| Tryptophan (Trp) (C11H12N2O2) | 289 (decomposes) |
| Tyrosine (Tyr) (C9H11NO3) | 343 (decomposes) |
| Valine (Val) (C5H11NO2) | 295 (decomposes) |
Related Tables
References: 1) Cardarelli, François. Materials Handbook: A Concise Desktop Reference. Switzerland: Springer International Publishing, 2018. 2) CRC Handbook of Chemistry and Physics, 97th Edition. United Kingdom: CRC Press, 2016-2017. 3) Yaws, Carl L. The Yaws Handbook of Physical Properties for Hydrocarbons and Chemicals. Netherlands: Elsevier Science, 2015. 4) Occupational Safety and Health Administration (OSHA): The National Institute for Occupational Safety and Health (NIOSH).