H-L-His-NH2*2HCl

L-Histidine Amine Dihydrochloride (H-L-His-NH2·2HCl) is a histidine-based amino acid derivative presented as a dihydrochloride salt, featuring the α-amino acid backbone with a free primary amine at the side-chain terminus (amino methyl) and an imidazole-containing side chain that can participate in acid-base equilibria. The stereogenic center corresponds to L-configuration, and the salt form increases water solubility while moderating nucleophilicity of the amino groups under strongly acidic conditions. The imidazole ring provides a chemically distinct handle for selective derivatization and coordination chemistry, while the additional amino functionality supports salt-stabilized handling and subsequent coupling chemistry. As a chiral, functionalized amino building block, H-L-His-NH2·2HCl can be used to access histidine-containing intermediates, peptide fragments, and amino acid analogs relevant to biochemical research and synthetic organic chemistry.

1. Peptide Synthesis

L-Histidine Amine Dihydrochloride (H-L-His-NH2·2HCl) supports peptide coupling strategies where histidine's imidazole side chain must be protected or selectively activated to prevent side reactions during amide bond formation. The compound's L-amino acid stereochemistry and salt-stabilized primary amine enable controlled transformation into protected amino acid derivatives suitable for N-terminal or side-chain functional peptide fragments. Imidazole reactivity can be managed through standard protection-group approaches, allowing incorporation into peptide building blocks for sequence-defined synthesis. Downstream, histidine-containing peptides and peptide-like scaffolds can be assembled for biochemical assays, protein-structure studies, and synthetic methodology development.

2. Chemical Biology Probes

L-Histidine Amine Dihydrochloride (H-L-His-NH2·2HCl) is applicable in chemical biology workflows that require an imidazole-bearing chiral amino acid motif for recognition, metal coordination, or pH-responsive behavior. The imidazole side chain and the additional amino group can be used to generate derivatized probes, including linker-bearing amino acid intermediates for attaching to biomolecules or surfaces. Salt-state handling facilitates reproducible reagent preparation for conjugation chemistry, while subsequent protection and deprotection steps can tune chemoselectivity toward the desired functional group. Resulting histidine-based labeling reagents and molecular recognition elements can be employed for studying binding interactions, reaction environments, and biomolecular microheterogeneity.

3. Bioconjugation Chemistry

L-Histidine Amine Dihydrochloride (H-L-His-NH2·2HCl) serves as a chiral amino acid precursor for constructing bioconjugation linkers and coupling handles that incorporate an imidazole-functional side chain. The presence of amino groups enables conversion into activated intermediates for amide or urea formation, while the imidazole can be retained for metal-directed conjugation or further functionalization after selective protection. Salt formation supports aqueous compatibility during intermediate preparation, and downstream deprotection can regenerate the reactive imidazole for conjugation steps that require specific coordination chemistry. Histidine-containing conjugates derived from this building block can be used to generate labeled biomolecules, affinity reagents, and peptide-based materials for applied biochemical research.

4. Process Chemistry Intermediate

L-Histidine Amine Dihydrochloride (H-L-His-NH2·2HCl) is suitable as a chiral, water-soluble amino acid intermediate in process chemistry routes targeting histidine-derived building blocks and protected derivatives. The L-configuration and functional group pattern allow transformation into protected amino acid derivatives, side-chain-modified analogs, or salt-controlled intermediates that can be fed into downstream coupling operations. The dihydrochloride form can be leveraged for reproducible handling and for managing protonation states during protection-group installation or activation steps. Downstream manufacture can include fine chemical synthesis of histidine-containing fragments used in peptide manufacturing, specialty reagent production, and industrial intermediate preparation.

5. Analytical Standards And Labeling

L-Histidine Amine Dihydrochloride (H-L-His-NH2·2HCl) can be employed in analytical research as a reference material for chromatographic and spectrometric characterization of histidine-containing compounds and amino acid derivatives. The imidazole side chain and defined stereochemistry support method development for amino acid analysis, including verification of derivatization efficiency and detection selectivity for histidine motifs. The functional amino groups enable conversion into labeled or derivatized standards that improve quantification of related peptide fragments and amino acid adducts. Generated analytical standards and labeling intermediates can support quality control workflows in synthetic chemistry, peptide development, and biochemical assay development where histidine-containing species are quantified.

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