2-Nitro-L-tryptophan is a naturally occurring amino acid derivative in which the indole ring of L-tryptophan bears a nitro substituent at the 2-position, retaining the core indole side chain alongside the amino acid backbone. The molecule contains an α-amino group and a carboxyl group, with the L-configuration indicated in the product name and the electron-withdrawing nitro group on the aromatic heterocycle providing distinct polarity and hydrogen-bonding/π-interaction characteristics compared with unsubstituted tryptophan. In peptide and protein chemistry, this side-chain-functionalized tryptophan analogue is used to introduce a nitro-bearing indole residue for structure-activity studies, chemical labeling or conjugation handle development, and analytical method development where the modified aromatic environment is used to probe binding or detection responses.
CAT No: CP25001
2-Nitro-L-tryptophan is an L-configured tryptophan analog bearing a nitro group at the 2-position of the indole ring, providing a distinct electronic and reactivity profile compared with native tryptophan. This aromatic nitro substitution makes the compound a useful building block for chemical biology and peptide/bioconjugation workflows where indole electronics, site-specific aromatic labeling, or nitro-functional handles are required. Researchers also use 2-nitro-L-tryptophan as a specialized amino acid reference material in analytical studies involving tryptophan-derivative chemistry.
1. Peptide Building Block Use
2-Nitro-L-tryptophan is used as an aromatic amino acid building block for preparing peptides that contain a defined tryptophan analog at specific positions, enabling structure-property studies driven by altered indole electronics. Peptide synthesis users commonly incorporate this residue into short peptide probes, binding-mapping peptides, and mechanistic peptide series where the nitro-substituted indole serves as a controlled modification relative to unmodified tryptophan. Because the nitro group is embedded in the indole ring rather than the side-chain nitrogen, the residue can be introduced as a chemically defined substitution to support comparative studies of aromatic environment effects in peptide assemblies.
2. Chemical Biology Aromatic Probes
2-Nitro-L-tryptophan supports chemical biology workflows that rely on indole-ring functionalization to probe microenvironment-dependent behavior and aromatic residue reactivity in biomolecular contexts. Chemical biology and protein chemistry groups use this reagent to construct tryptophan-analog probes for studying how aromatic substitution influences local polarity, electronic effects, and downstream chemical behavior during labeling or analytical readouts. The nitro-substituted indole motif is particularly useful when researchers want a tryptophan-derived aromatic reporter that differs in electronic character from native tryptophan while remaining structurally recognizable as an indole-containing amino acid.
3. Analytical Reference For LC-MS
2-Nitro-L-tryptophan is widely used as an analytical reference standard for method development and quantitation workflows involving tryptophan-derivative chemistry. Analytical chemistry teams employ this compound to support LC-MS and related assays where nitro-indole species need distinct retention and mass signatures for calibration, identification, or monitoring of derivatized products. In laboratories studying aromatic amino acid modifications or nitroindole formation/handling, having a defined 2-nitro-L-tryptophan standard improves confidence in assigning peaks and tracking analytes across sample preparation and instrument conditions.
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