Boc-[15N]Val-OH

Boc-[15N]Val-OH is a nitrogen-15 stable isotope-labeled valine derivative supplied as a Boc-protected amino acid, combining a protected α-amino group with a side chain characteristic of valine (isopropyl). The [15N] label enables isotope-resolved workflows in peptide and amino acid quantification, while the Boc group supports controlled incorporation into protected peptide-building sequences and intermediate preparation. Researchers use this form when they need a defined mass shift and minimal ambiguity about the labeled nitrogen's position in downstream LC-MS or MS/MS methods.

1. Isotope-Resolved Peptide Standards

Boc-[15N]Val-OH is used to prepare isotope-resolved peptide standards and labeled internal references for quantitative LC-MS workflows where the nitrogen label position matters. Because the α-amino nitrogen is protected and isotopically defined, it supports consistent incorporation into peptide fragments during standard preparation, improving interpretability of isotope-coded signals in targeted analyses. Analytical groups in proteomics and peptide method development select this reagent when they require a reliable mass tag for valine-containing sequences, calibration checks, or retention-time and fragmentation pattern benchmarking under defined instrument conditions.

2. Stable Isotope Tracing Method Development

Boc-[15N]Val-OH supports stable isotope tracing experiments and tracer-related method development where valine-derived nitrogen enrichment is tracked by mass spectrometry. Analytical chemistry teams and chemical biology laboratories often use labeled amino acid derivatives as defined inputs for calibrating isotope response, validating sample preparation workflows, and establishing quantitation performance for isotope-ratio readouts. The [15N] enrichment is particularly useful for distinguishing labeled nitrogen-containing species from unlabeled background, while the Boc protection helps maintain reagent integrity during handling and derivatization steps used to generate analyzable standards.

3. Labeled Peptide Intermediate Synthesis

Boc-[15N]Val-OH is commonly employed as a building-block intermediate for preparing Boc-protected, nitrogen-15-labeled peptide segments or peptide synthesis precursors used in research-grade labeled constructs. Custom peptide synthesis groups and medicinal chemistry teams use this reagent when they need a valine residue carrying an isotopically defined nitrogen for downstream assembly, fragment generation, or structural studies that rely on isotope-resolved detection. The Boc-protected amino functionality supports controlled peptide-assembly strategies that keep the labeled nitrogen chemically well-defined until incorporation into the target labeled peptide material.

4. Quantitative LC-MS Internal Standards

Boc-[15N]Val-OH is leveraged to generate quantitative internal standards for amino acid and peptide analyses that require a defined isotopic mass shift attributable to the [15N] label. Method developers use isotope-labeled amino acid derivatives to correct for variability introduced during extraction, derivatization, chromatographic separation, and ionization, improving the robustness of quantitation workflows. In practice, the reagent's Boc protection and labeled nitrogen enable preparation of standards that align with the labeled analyte's mass and fragmentation behavior, supporting more reliable normalization in targeted assays.

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