Boc-[15N]Leu-OH

Boc-[15N]Leu-OH is an N-15 stable isotope-labeled leucine building block in a Boc-protected amino acid form, providing a defined enrichment at the amino nitrogen for mass-shift-based applications. In peptide and analytical workflows, this protected, isotopically labeled reagent is used when the nitrogen label must be tracked or quantified with high specificity, while the Boc group supports controlled incorporation into protected peptide segments or standardized derivatization schemes.

1. Isotopic Peptide Standards

Boc-[15N]Leu-OH is used to prepare N-15-labeled peptide standards for quantitative LC-MS workflows, including targeted peptide quantification and method development. Researchers in proteomics and analytical chemistry rely on this labeled leucine building block to generate internal standards that match the chemical environment of leucine-containing tryptic or synthetic peptides, improving correction for ionization variability and instrument response. The Boc-protected format also supports consistent downstream assembly into defined peptide sequences used for calibration and performance checks.

2. Proteomics Quantification

Boc-[15N]Leu-OH supports protein and proteome quantification strategies where nitrogen isotope labeling is leveraged to distinguish labeled peptides from endogenous counterparts. Proteomics groups use this reagent to construct labeled peptide surrogates and reference materials that enable accurate relative quantitation in workflows such as isotope-coded standard approaches and labeled peptide benchmarking. The N-15 label at the amino nitrogen provides a predictable mass shift for MS readouts, making the reagent particularly useful when leucine-containing peptides are key reporting species.

3. Labeled Peptide Synthesis

Boc-[15N]Leu-OH is applied as a protected, isotopically labeled amino acid building block for constructing leucine-containing peptide segments with defined N-15 incorporation. Peptide synthesis teams use it when an N-15 label is required at the residue level for downstream MS tracing, structural studies, or reference material generation, while the Boc protection helps maintain compatibility with common protected-amino-acid peptide assembly workflows. This makes the reagent a practical choice for producing defined isotopologues of peptides used in analytical method validation and chemical biology tool development.

4. Stable Isotope Tracing Tools

Boc-[15N]Leu-OH is also used to generate N-15-labeled chemical tools and standards for tracer-oriented studies that depend on nitrogen-specific mass signatures. Metabolic research and chemical biology laboratories often require isotopically defined leucine derivatives to track incorporation patterns by LC-MS, and this Boc-protected, N-15-labeled building block provides a controlled starting point for preparing labeled peptide-like analytes or calibration materials. The defined N-15 labeling supports unambiguous MS discrimination when leucine-derived species are monitored across complex sample matrices.

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