5-Methyl-DL-tryptophan is a substituted tryptophan amino acid featuring an indole side chain bearing a 5-methyl group, with both amino and carboxyl functional groups present on the α-carbon. The "DL" designation indicates a racemic mixture of stereoisomers at the α-position, and the molecule retains the indole nitrogen and aromatic π-system that can participate in noncovalent interactions and serve as a structural motif in peptide analogs. As a non-natural, side-chain-modified tryptophan analogue, it is used in peptide synthesis and chemical biology workflows to probe structure-property relationships, support incorporation of modified aromatic residues, and enable analytical method development for tryptophan-derivative handling and labeling studies.
CAT No: CP24903
5-Methyl-DL-tryptophan is a tryptophan analog featuring a methyl substituent at the 5-position on the indole ring, supplied as a DL mixture that contains both D- and L- stereoisomers. This non-proteinogenic tryptophan derivative retains the indole core used in many indole-based structure-property studies while introducing steric and electronic modulation through the 5-methyl group. As an amino acid building block, it is commonly used in peptide and small-molecule research where indole chemistry, aromatic labeling strategies, or tryptophan-site analogs are required.
1. Indole-Analog Peptide Building
5-Methyl-DL-tryptophan is used as an indole-containing amino acid building block for peptide synthesis workflows that require a tryptophan-site analog rather than native tryptophan. Researchers incorporate the 5-methyl indole residue to probe how indole substitution affects local conformation, aromatic packing, and chemical reactivity patterns within peptide sequences. Because the material is provided as a DL mixture, it is often selected for screening-style studies, method development, or comparative chemistry where stereochemical separation is not the primary experimental variable.
2. Structure-Reactivity Studies
5-Methyl-DL-tryptophan supports chemical biology and medicinal chemistry efforts aimed at mapping how indole substitution influences reactivity and physicochemical behavior. The 5-methyl group can be leveraged to modulate electronic density and steric accessibility at the indole ring, making this analog useful for studying indole-dependent transformations in peptide contexts or in small-molecule scaffolds derived from tryptophan. Teams developing SAR (structure-activity relationship) series or mechanistic chemistry models frequently use substituted tryptophan analogs like this to generate consistent, chemically defined reference materials.
3. Analytical Reference Material
5-Methyl-DL-tryptophan is frequently used as a defined amino acid standard for analytical method development and compound identification work involving indole-containing analytes. In LC-MS and related workflows, the distinct 5-methyl substitution provides a measurable mass/fragmentation signature relative to native tryptophan, helping laboratories validate chromatographic separation, retention-time behavior, and spectral interpretation for indole analogs. Analytical groups preparing calibration or qualification sets for tryptophan-derivative panels often choose this compound when the experimental target includes 5-substituted indole amino acid motifs.
4. Chiral Control Screening
5-Methyl-DL-tryptophan is commonly selected in early-stage experimental planning when a stereochemical mixture is acceptable for assessing feasibility before committing to enantiopure material. Peptide chemists and small-molecule developers use the DL form to quickly evaluate whether the 5-methyl indole substitution produces the desired downstream behavior in a sequence or scaffold, while reserving later steps for stereochemical refinement if needed. This approach is particularly practical for library-style synthesis, comparative reactivity assays, and initial compatibility testing with coupling and purification workflows.
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4. SERS spectrum of the peptide thymosin‐β4 obtained with Ag nanorod substrate
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