Anodyne

Met
Methionine
Molecular structure via molpic based on CDK
Physical properties
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149.21 g/mol [1]
Density1.178 at 68 °F (NTP, 1992) - Denser than water; will sink g/cm3 [1]
AppearanceMinute hexagonal plates from dilute alcohol [1]
OdorFaint [1]
TasteSulfurous [1]
Melting point536 to 540 °F decomposes 541.4-543.2 °F (NTP, 1992) [1]
Boiling pointsublimes at 367 °F (NTP, 1992) [1]
DecompositionWhen heated to decomposition it emits very toxic fumes of /nitric oxide/ and /sulfur oxide/. [1]
SolubilitySoluble (NTP, 1992) [1]
-1.9 [1]
Structural Identifiers
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C5H11NO2[1]
(2S)-2-amino-4-methylsulfanylbutanoic acid [1]
CSCC[C@@H](C(=O)O)N [1]
InChI=1S/C5H11NO2S/c1-9-3-2-4(6)5(7)8/h4H,2-3,6H2,1H3,(H,7,8)/t4-/m0/s1 [1]
InChIKeyFFEARJCKVFRZRR-BYPYZUCNSA-N [1]

Methionine

Methionine is a substance of the amino acid class.

Chemistry

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Methionine is a absolute mixture

See also []

External links []

References []

  1. National Center for Biotechnology Information. PubChem Compound Summary for CID 6137, L-Methionine. Accessed December 19, 2025. https://pubchem.ncbi.nlm.nih.gov/compound/6137

  2. U.S. Food and Drug Administration; National Center for Advancing Translational Sciences. Methionine. UNII: AE28F7PNPL. Global Substance Registration System. Accessed December 19, 2025. https://gsrs.ncats.nih.gov/ginas/app/beta/substances/AE28F7PNPL