5-Hydroxy-DL-tryptophan is a hydroxylated tryptophan amino acid derivative featuring an indole ring bearing a 5-hydroxy substituent and a free amino group and carboxyl group characteristic of an amino acid. The molecule is specified as DL, indicating a racemic mixture of D and L stereoisomers, and the side chain contains the indole N-H along with a phenolic hydroxyl that can participate in hydrogen bonding and acid-base behavior relevant to indole chemistry. As an amino acid building block, it is used in peptide and structure-activity studies to introduce a hydroxylated indole side chain, and it can also serve as a substrate or reference material in analytical method development for indole-containing amino acids and their derivatives.
CAT No: CP24703
5-Hydroxy-DL-tryptophan is a tryptophan derivative bearing a hydroxyl group on the indole ring, supplied as a DL mixture that provides both D- and L-tryptophan stereoisomers for assay development and analytical workflows. The phenolic indole functionality makes it a useful aromatic amino acid building block for chemical biology experiments where indole oxidation state and phenolic reactivity can be controlled during downstream derivatization. In practice, researchers select this material when they need a tryptophan-like scaffold with an additional ring hydroxyl for peptide-related chemistry, reference compound preparation, or method development.
1. Peptide Building Block Use
5-Hydroxy-DL-tryptophan is employed as an amino acid building block in peptide synthesis workflows that require an indole ring bearing a phenolic hydroxyl functionality. Peptide chemists use it to generate tryptophan-containing sequences for structure-property studies, including experiments where the indole hydroxyl can influence local polarity, hydrogen-bonding patterns, or susceptibility to oxidative/derivatization steps during peptide handling. Because the product is supplied as a DL mixture, it is commonly chosen for exploratory library work, comparative reactivity studies, or when stereochemical separation is not required for the intended downstream readout.
2. Chemical Biology Derivatization Studies
5-Hydroxy-DL-tryptophan is used in chemical biology research as a tryptophan analog for designing indole/phenol-responsive derivatization strategies and reactivity assays. The hydroxylated indole scaffold supports downstream functionalization approaches used to probe aromatic amino acid behavior in complex mixtures, such as monitoring phenolic indole transformation during sample processing or creating defined standards for downstream chromatographic and mass spectrometric characterization. Researchers in biochemistry and analytical chemistry often select this compound when they need a structurally close reference to tryptophan with an added phenolic handle that can be tracked through derivatization and detection.
3. Analytical Reference Standard Preparation
5-Hydroxy-DL-tryptophan is widely used as an analytical reference material for LC-MS and related quantification workflows targeting hydroxylated indole amino acid species. Analysts rely on this compound to build calibration curves, evaluate extraction/derivatization recovery, and confirm retention-time and mass spectral behavior for indole-containing analytes in biological or chemical matrices. The DL stereochemical mixture is advantageous when the analytical method reports total signal for the hydroxylated indole amino acid rather than requiring enantiomer-resolved quantitation.
4. Pharmaceutical Intermediate Development
5-Hydroxy-DL-tryptophan serves as a specialty amino acid starting material for the development of indole-containing chemical intermediates used in medicinal chemistry discovery and process R&D. Synthetic teams use the hydroxylated indole motif to access downstream heteroaryl transformations and to prepare defined aromatic fragments that retain the phenolic functionality for further functional group manipulation. In industrial and contract research settings, this product is selected when a tryptophan-derived indole scaffold with an additional hydroxyl group is required to support structure-activity exploration or to generate consistent, well-characterized intermediates for downstream synthesis.
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