Fmoc-[D10]Leu-OH is a fluorenylmethyloxycarbonyl (Fmoc) protected leucine derivative bearing ten deuterium atoms on the leucine side-chain, classifying it as a protected, isotopically labeled amino acid used for peptide chemistry. The molecule contains an Fmoc carbamate protecting the amino group while retaining a free carboxylic acid, and the deuteration pattern provides an isotopically labeled aliphatic side chain without changing the presence of the characteristic leucine isobutyl functionality. In synthesis and analysis, it is employed as a labeled building block for solid-phase or solution-phase peptide assembly and for mass spectrometric or tracer-based studies where isotopic incorporation at the leucine position is monitored.
Fmoc-[D10]Leu-OH is an Fmoc-protected deuterated leucine amino acid in which the leucine side chain is labeled with ten deuterium atoms, preserving the (chiral) amino acid framework while enabling mass-shift tracking in analytical workflows. The molecule contains the Fmoc carbamate on the amino nitrogen and a free carboxylic acid, providing the characteristic orthogonality needed for stepwise peptide coupling and subsequent deprotection. The deuteration pattern alters NMR and mass spectrometric behavior without changing the leucine backbone stereochemistry, which can support kinetic and distribution studies where isotopic discrimination is required. The combination of a protected amine, a reactive carboxyl group, and a hydrophobic, branched isobutyl side chain makes it suitable for peptide building-block preparation and downstream synthetic manipulation in isotope-labeled amino acid chemistry.
1. Isotope-Labeled Peptide Synthesis
Fmoc-[D10]Leu-OH is used in peptide synthesis workflows requiring stable-isotope incorporation for quantitative mass spectrometry and LC-MS/MS-based peptide profiling. The Fmoc-protected amine supports standard solid-phase peptide coupling after activation of the carboxylic acid, while the deuterated leucine side chain provides a predictable mass shift that can be resolved from unlabeled analogs. The maintained leucine stereochemistry helps preserve conformational and steric properties of the target peptide sequence, which is important when comparing labeled versus unlabeled species in structure-function experiments. Incorporation of this labeled building block enables isotope-resolved peptide standards, method development, and controlled synthesis of deuterated peptide analogs for biochemical research.
2. Quantitative Proteomics Standards
Fmoc-[D10]Leu-OH serves as a chiral, isotopically defined amino acid input for generating internal standards and calibration materials used in quantitative proteomics and targeted proteome analysis. The free carboxylic acid and Fmoc-protected nitrogen allow conversion into labeled peptide constructs that can mimic tryptic or enzymatic digestion patterns while retaining the deuterium signature. The tenfold deuteration can improve detectability and quantification by enabling clear separation of labeled peptides from endogenous counterparts in mass spectrometric readouts. Downstream preparation of labeled peptides from this amino acid supports reproducible analytical reference compounds for proteome quantification, peptide mapping, and assay validation.
3. Peptidomimetic And SAR Probes
Fmoc-[D10]Leu-OH is applied in peptidomimetic and SAR studies where isotopic labeling helps track metabolic stability, binding-site occupancy, or fragment incorporation in synthetic libraries. The leucine side-chain hydrophobicity and branched geometry are retained through the stereodefined amino acid backbone, while the Fmoc group enables controlled assembly into peptide-like scaffolds or hybrid peptidomimetics. The deuterium label can be leveraged to monitor incorporation and degradation pathways using mass-based readouts without introducing additional functional groups that might perturb binding. Formation of deuterated analogs from this protected amino acid supports structure-activity relationship investigations and molecular design iterations in synthetic organic chemistry.
4. Process Chemistry Intermediate
Fmoc-[D10]Leu-OH functions as a defined chiral intermediate for manufacturing deuterated amino acid derivatives and isotope-labeled fine chemicals used in research-grade supply chains. The Fmoc carbamate provides a robust protection strategy for the amino functionality during upstream handling, while the carboxylic acid enables reliable conversion to activated species for coupling or for further derivatization. The deuterated side chain is chemically stable under typical peptide synthesis conditions, supporting consistent isotopic content through multi-step sequences. Preparation of downstream labeled intermediates and peptide-building blocks from this material can be integrated into scalable process routes for isotope-labeled reagents and specialty chemical production.
5. Chemical Biology Labeling
Fmoc-[D10]Leu-OH is suitable for chemical biology workflows that require incorporation of an isotopically distinct leucine residue into bioactive peptide probes or enzyme-interaction substrates. The protected amine and free acid enable stepwise construction of labeled peptides that can be used to interrogate binding, trafficking, or processing events via mass spectrometric detection of labeled fragments. The deuterated leucine side chain can serve as a tracer to distinguish probe-derived material from background species in complex biological matrices. Use of this Fmoc-labeled amino acid supports generation of isotope-resolved molecular tools for mechanistic studies, protein interaction mapping, and analytical tracking in applied biochemical research.
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