Boc-[15N]Tyr-OH is a protected, isotopically labeled tyrosine derivative in which the amino acid nitrogen is enriched with 15N and the α-amino group is masked as a Boc (tert-butoxycarbonyl) carbamate. The molecule retains the tyrosine side chain bearing a phenolic hydroxyl, along with a free carboxylic acid functionality, and the Boc protection controls chemoselectivity by suppressing unprotected amine reactivity during peptide-building steps. As an isotopically labeled amino acid building block, it is used in peptide synthesis and related labeling workflows where 15N incorporation supports mass spectrometric or NMR-based tracking of incorporation and structural studies of tyrosine-containing peptide motifs.
Boc-[15N]Tyr-OH is a Boc-protected tyrosine derivative bearing a stable isotope label on the nitrogen atom of the amino group, providing a defined 15N mass signature while retaining the tyrosine side chain functionality. This protected, isotope-labeled amino acid building block is commonly used to control labeling at the peptide level, enabling quantitative workflows that benefit from a known isotopic shift. In peptide chemistry and analytical chemistry, the Boc protection supports downstream assembly or derivatization steps where an amino-protected, side-chain-bearing tyrosine residue is required.
1. Isotope-Labeled Peptide Synthesis
Boc-[15N]Tyr-OH is used by peptide synthesis groups to introduce a single, well-defined 15N label at a tyrosine position within a peptide sequence. Researchers developing isotope-coded peptides for quantitative LC-MS workflows rely on the Boc-protected amino group to maintain compatibility with peptide-building strategies that start from protected amino acid residues. The tyrosine side chain supports typical tyrosine-containing peptide designs, while the 15N label enables targeted mass shifts for distinguishing labeled from unlabeled analogs during sample comparison and method development.
2. Quantitative LC-MS Internal Standards
Boc-[15N]Tyr-OH serves as a building block for preparing isotope-labeled peptide standards and reference materials used in quantitative mass spectrometry. Analytical chemists and proteomics method developers commonly incorporate an isotopically labeled tyrosine residue to generate labeled peptide calibrators that track recovery, ionization behavior, and instrument response under consistent chemistry. The presence of a defined 15N label helps reduce ambiguity in peak assignment and supports robust relative quantification when paired with corresponding unlabeled peptide species.
3. Stable-Isotope Proteomics Controls
Boc-[15N]Tyr-OH is applied in proteomics and chemical biology workflows where isotope-labeled peptide controls are needed to validate identification and quantification pipelines. Protein science teams often use labeled tyrosine-containing peptides as reference points for assessing digestion performance, chromatographic alignment, and data processing settings. By using a Boc-protected, isotope-labeled tyrosine building block, developers can generate peptide controls with predictable labeling patterns that improve confidence in downstream interpretation of MS-based datasets.
4. Labeled Amino Acid Derivatization
Boc-[15N]Tyr-OH is also used in analytical chemistry settings to prepare labeled derivatives or standards that incorporate an isotopically tagged tyrosine moiety. Researchers preparing reference compounds for method validation, instrument tuning, or comparative studies benefit from the stable 15N label, which provides a clear mass difference relative to unlabeled tyrosine derivatives. The Boc protection offers a convenient starting point for workflows that require an amino-protected tyrosine unit before converting to the final analytical form.
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