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• W1567681143 abstract "The conformational analysis of DL-, L- and D-methionine was studied by solid-state 13C NMR with the help of cross-polarization and magic-angle spinning techniques. The spectrum of commercial crystalline DL-methionine showed two chemical shifts (18.7 and 15.8 ppm) for the methyl carbon. Crystallization from water or water-ethanol (95 : 5) allowed the separation of two crystalline forms (α and β), of which one had δ (CH3) 18.7 ppm and the other δ (CH3) 15.8 ppm. Therefore, each crystalline form of DL-methionine consists of a single conformer, a result in agreement with x-ray diffraction data. This conformational difference of the two crystalline forms was also reflected in the carbon resonances of C-β and C-γ. When L- and D-methionine were crystallized from water-ethanol (3 : 2), the solid-state 13C NMR spectra showed that each isomer displayed two methyl carbon peaks at 18.1 and 16.2 ppm of equal intensities, while the α-carbon resonances showed a broad peak due to two unresolved doublets. These results suggest that the L- or D-methionine crystal contains two different conformers in one unit cell, a conclusion that is also supported by the x-ray data." @default.
• W1567681143 created "2016-06-24" @default.
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• W1567681143 date "1986-02-01" @default.
• W1567681143 modified "2023-09-26" @default.
• W1567681143 title "Conformational analysis ofDL-,L- andD-methionine by solid-state13C NMR spectroscopy" @default.
• W1567681143 cites W1965023247 @default.
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• W1567681143 doi "https://doi.org/10.1002/mrc.1260240213" @default.
• W1567681143 hasPublicationYear "1986" @default.
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