DL-Methionine
- Formula: C5H11NO2S
- Molecular weight: 149.211
- IUPAC Standard InChI: InChI=1S/C5H11NO2S/c1-9-3-2-4(6)5(7)8/h4H,2-3,6H2,1H3,(H,7,8)
- IUPAC Standard InChIKey: FFEARJCKVFRZRR-UHFFFAOYSA-N
- CAS Registry Number: 59-51-8
- Chemical structure:
This structure is also available as a 2d Mol file - Species with the same structure:
- Stereoisomers:
- Other names: Racemethionine; DL-2-Amino-4-(methylthio)butanoic acid; DL-CH3SCH2CH2CH(NH2)COOH; α-Amino-γ-methylmercaptobutyric acid; (.+/-.)-Methionine; Acimetion; Banthionine; Cynaron; Dyprin; DL-2-Amino-4-(methylthio)butyric acid; Lobamine; Meonine; Mertionin; Methilanin; Methionine; Methionine, DL-; Metione; Neston; Urimeth; Pedameth; 2-Amino-4-(methylmercapto)butyric acid; Amurex; Methilonin; Methionine dl-form; Metion; Petameth; NSC 9241
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Phase change data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: Eugene S. Domalski and Elizabeth D. Hearing
Enthalpy of phase transition
| ΔHtrs (kcal/mol) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
|---|---|---|---|---|---|
| 1.300 | 305.5 | crystaline, II | crystaline, I | Hutchens, Cole, et al., 1964 | Lambda transition over the temperature range 250 to 350 K with a maximum at 305.5 K. |
Entropy of phase transition
| ΔStrs (cal/mol*K) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
|---|---|---|---|---|---|
| 4.21 | 305.5 | crystaline, II | crystaline, I | Hutchens, Cole, et al., 1964 | Lambda |
References
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Hutchens, Cole, et al., 1964
Hutchens, J.O.; Cole, A.G.; Stout, J.W.,
Heat capacities and entropies of L-cystine and L-methionine. The transition of L-methionine near 305.5 K,
J. Biol. Chem., 1964, 239, 591-595. [all data]
Notes
Go To: Top, Phase change data, References
- Symbols used in this document:
ΔHtrs Enthalpy of phase transition ΔStrs Entropy of phase transition - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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