H-[15N]Val-OH

H-[15N]Val-OH is a stable-isotope labeled valine in which the amino nitrogen is enriched with 15N, while the α-amino acid framework retains the L-stereochemical configuration and the characteristic isopropyl side chain. The molecule presents an amino group and a carboxylic acid functionality in the free acid form, enabling standard amino acid handling in peptide chemistry and biochemical workflows. The 15N label creates a distinct spectroscopic signature for NMR and mass spectrometric tracking without altering the valine backbone connectivity. As a chiral amino acid building block, H-[15N]Val-OH functions as a chemically defined intermediate and analytical reference for nitrogen-resolved studies in amino acid derivatization and peptide construction.

1. Isotope Tracing NMR

H-[15N]Val-OH supports isotope-resolved analytical research in NMR spectroscopy where the 15N-enriched amino nitrogen provides direct observation of nitrogen-containing environments during amino acid incorporation and subsequent transformations. The labeled α-amino group and carboxylate allow controlled participation in peptide coupling chemistry, enabling monitoring of amide bond formation and nitrogen chemical shift changes in valine-containing sequences. The isopropyl side chain remains chemically consistent with native valine, which helps interpret structural effects without introducing additional functional-group complexity. Downstream, the labeled amino acid can be used to generate 15N-containing peptide fragments or standards for mechanistic studies of acylation, deprotection, and side-chain compatibility in synthetic and biochemical research.

2. Peptide Synthesis Labeling

H-[15N]Val-OH is suitable for peptide building block preparation where incorporation of a single 15N-labeled valine residue enables nitrogen-traceable peptide synthesis and sequence-specific characterization. The free amino acid form can be converted into coupling-compatible derivatives, while the stereogenic center at the α-carbon maintains the L-configuration required for stereochemically accurate peptide analogs. The carboxylic acid functionality enables formation of amide linkages under standard peptide coupling strategies, and the isopropyl side chain provides a chemically stable hydrophobic residue for constructing valine-containing segments. Resulting labeled peptides and intermediates serve as research materials for structural verification, coupling efficiency assessment by nitrogen-sensitive spectroscopy, and validation of peptide assembly workflows in chemical synthesis.

3. Protein Engineering Studies

H-[15N]Val-OH can be applied in protein engineering and chemical biology contexts that require nitrogen-labeled amino acid inputs for tracking incorporation into proteinogenic sequences. The labeled α-amino nitrogen and preserved valine stereochemistry allow the residue to be treated as a chemically defined valine source in studies that monitor nitrogen distribution across protein fragments. The side-chain isopropyl group contributes hydrophobic packing features while remaining chemically comparable to unlabeled valine, supporting interpretation of structural or conformational effects attributable to labeling rather than side-chain modification. Downstream uses include preparation of labeled protein fragments for mass spectrometric mapping, nitrogen-resolved NMR investigations, and analytical characterization of proteomic or peptide-based constructs.

4. Analytical Reference Standards

H-[15N]Val-OH functions as an analytical research standard for validating nitrogen-specific detection methods such as isotope-ratio mass spectrometry and 15N NMR-based quantification of valine-derived species. The defined 15N enrichment on the amino nitrogen yields a predictable isotopic pattern that can be used to calibrate instrumentation and to distinguish labeled from unlabeled amino acid pools during derivatization or peptide hydrolysis workflows. The presence of both amino and carboxylic acid groups supports analytical conversion to common derivatization forms used in amino acid profiling and quality control of labeled building blocks. Broader relevance includes development of reference materials for amino acid derivatization method development, isotope labeling verification, and nitrogen-resolved analytical method transfer in fine chemical and research laboratories.

5. Process Chemistry Intermediate

H-[15N]Val-OH serves as a defined chiral amino acid intermediate for process chemistry routes that require isotope-labeled nitrogen incorporation into downstream peptide building blocks. The intact α-amino acid functionality supports conversion into activated or protected forms compatible with large-scale peptide coupling strategies, while the L-stereocenter provides stereochemical consistency across manufacturing batches. The non-functionalized isopropyl side chain reduces side reactions relative to more reactive side-chain functional groups, supporting predictable downstream handling during intermediate preparation. Resulting labeled intermediates can be employed for production of isotope-labeled peptides and nitrogen-traceable reagents used in biochemical research workflows and analytical standard generation.

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