Ac-D-Ala-OH

Ac-D-Ala-OH is an N-acetylated D-alanine building block supplied as a free carboxylic acid, combining a stereochemically defined D-configured amino acid backbone with an amide-protected N-terminus. This structure makes it a practical fragment for preparing D-alanine-containing peptides and peptidomimetic motifs where N-acetylation is required to control terminal reactivity and mimic capped peptide termini. In peptide chemistry and analytical workflows, Ac-D-Ala-OH is commonly handled as a stable, non-zwitterionic amino acid derivative that supports downstream coupling chemistry without needing immediate N-protection.

1. D-Ala Peptide Fragment

Ac-D-Ala-OH is used by peptide synthesis groups and custom peptide manufacturers as a capped D-alanine residue for assembling D-alanine-containing peptides, including short sequences and protected fragments where the N-terminus must remain acetylated. The N-acetyl group suppresses free amino reactivity during coupling steps, enabling cleaner segment condensation and minimizing side reactions associated with unprotected amino termini. Researchers building stereochemically defined peptides for structure-activity relationship studies and conformational investigations often select this derivative to ensure the D-configuration and N-acetyl capping are carried consistently into the final sequence.

2. Peptidomimetic And SAR Building

Ac-D-Ala-OH is also applied in medicinal chemistry and peptidomimetic development as a standardized D-alanine unit for generating analog libraries with controlled terminal chemistry. By incorporating an N-acetylated D-alanine motif, chemists can tune peptide-like properties while maintaining a defined stereochemical element that is frequently used to probe how backbone chirality and terminal capping influence conformation and stability in structure-activity relationship workflows. This makes Ac-D-Ala-OH a common intermediate choice for iterative synthesis of analogs intended for downstream biological evaluation by collaborators, without requiring additional N-protection steps for the acetylated terminus.

3. Analytical Reference Standards

Ac-D-Ala-OH is used in analytical chemistry workflows as a defined stereochemical reference compound and calibration component when monitoring D-alanine-containing peptides, capped fragments, or degradation products. Laboratories performing LC-MS method development, peptide impurity profiling, and fragment identification often rely on N-acetylated amino acid derivatives to distinguish acetyl-capped species from free amino acid or differently capped analogs. The defined D-configuration and N-acetyl amide functionality help ensure that retention behavior and mass spectral features correspond specifically to the acetylated D-alanine motif present in the samples being analyzed.

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