L-METHIONINE (2,3,3,4,4-D5; METHYL-D3) is a deuterium- and methyl-deuterium isotopically labeled form of the proteinogenic amino acid methionine, featuring the standard amino acid backbone with a thioether-containing side chain. The molecule bears an unprotected α-amino group and α-carboxyl group, while the side-chain sulfur is part of a thioether (-CH2-CH2-S-CH3) in which the methyl group is labeled, and the backbone positions 2, 3, 3, 4, and 4 are deuterated as indicated by the name. This labeled amino acid is used in isotopic tracing, mass spectrometric quantification, and structure-analysis workflows where incorporation or detection of methionine-derived fragments benefits from the distinct isotopic signature.
CAT No: L-Iso-0436
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