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H-DL-Asp-OH is DL-aspartic acid, the racemic mixture of D- and L-aspartic acid. It retains both carboxyl groups and the free amino group and is used as a reference material, synthetic precursor, and model compound when amino-acid stereochemistry is not restricted to the natural L configuration.
The DL designation is experimentally important. A racemate should not be substituted for L-aspartic acid in a sequence-defined peptide when a single stereoisomer is required, but it can be useful for method development, derivatization studies, chiral analysis, or synthetic routes that later resolve or transform the stereocenter.
Product Information
| Product Name | H-DL-Asp-OH |
| Chemical Name | DL-Aspartic acid |
| Catalog No. | AS2009 |
| CAS No. | 617-45-8 |
| Molecular Formula | C4H7NO4 |
| Molecular Weight | 133.10 g/mol |
| Compound Type | Racemic acidic amino acid |
| Primary Research Use | Racemic amino-acid reference, synthetic precursor, and stereochemistry research |
Racemic Identity and Selection
DL-aspartic acid contains both enantiomers in equal proportion. This makes the material chemically different from isolated L-Asp or D-Asp even though CAS-based catalog searches may place all three close together.
When stereochemical control is the purpose of the experiment, researchers can compare dedicated D-form amino acids rather than treating the DL material as an equivalent.
Applications in Synthesis and Analysis
The free amino and two carboxyl groups allow derivatization, salt formation, esterification, and other amino-acid transformations. The racemate can also support method development for chiral separations or analytical workflows in which both enantiomers are intentionally present.
For procurement, the most important identity checks are the DL designation, CAS 617-45-8, formula, assay/purity, and lot-specific analytical data.
Use in Peptide Chemistry
DL-Asp is not normally selected for routine biological peptide synthesis when the native L residue is required. Its value is strongest in stereochemical control experiments, non-natural sequence studies, and precursor chemistry.
For broader design context, see how noncanonical amino acids are used to tune peptide structure and function.
Product Documents
The Safety Data Sheet provides product identification, hazard information, handling and storage guidance, exposure controls, transport information, and regulatory information for laboratory use.
Certificates of Analysis (COAs) are batch-specific. Please contact us to request the COA for your product, and we will provide it by email.
Frequently Asked Questions
Is H-DL-Asp-OH the same as L-aspartic acid?
No. H-DL-Asp-OH is a racemic mixture containing both D- and L-aspartic acid.
Can DL-Asp be used in sequence-defined peptides?
It can be used when a racemic residue is intentionally desired, but it is not appropriate when a single L or D stereoisomer is required.
Why search by CAS 617-45-8?
The CAS number helps distinguish DL-aspartic acid from the individual enantiomers and other aspartate derivatives.