L-Arginine 4-nitroanilide dihydrobromide is an arginine-derived amino acid amide in which the α-amino and α-carboxyl functions of L-arginine are converted into a peptide-like linkage, bearing a 4-nitroanilide as the amide acceptor while retaining the arginine side chain guanidinium functionality. The molecule contains a guanidinium group capable of ionic interactions and is provided as a dihydrobromide salt, with bromide counterions balancing the cationic charge; stereochemistry corresponds to the L-configuration indicated in the name. This arginine amide is used as a defined substrate or probe in peptide/amide chemistry, including analytical method development and structure-activity studies where a nitroanilide chromophore and the guanidinium side chain are relevant for monitoring reactions or binding behavior.
CAT No: CP00239
L-Arginine 4-nitroanilide dihydrobromide is an L-arginine-derived amide salt in which the α-amino acid backbone is converted to a primary amide with 4-nitroaniline, while the guanidinium side chain is present as a dihydrobromide salt. The molecule therefore combines a chiral amino acid stereocenter at Cα (L-configuration) with a strongly basic, salt-forming guanidinium group and an anilide aromatic chromophore bearing a nitro substituent. The 4-nitroanilide motif contributes measurable UV-Vis and chromatographic detectability, and the amide linkage provides a stable handle for enzymatic or chemical recognition in peptide-like contexts. The dihydrobromide counterions modulate solubility and protonation state, enabling controlled behavior during coupling, analytical derivatization, and substrate design workflows in both research and industrial settings.
1. Enzymatic Assay Substrate
L-Arginine 4-nitroanilide dihydrobromide is applied in biochemical assay development where arginine-specific proteases, amidases, or related catalytic systems require a chromogenic amide substrate. The guanidinium side chain mimics the cationic recognition element of L-arginine, while the 4-nitroanilide moiety acts as a reporter that can generate a measurable signal upon amide cleavage or related transformation. The salt-form guanidinium functionality supports consistent binding and reaction kinetics under aqueous conditions typical of analytical screening, and the stable amide linkage defines a clear cleavage site analogous to peptide bond chemistry. The resulting readouts can be used to compare substrate specificity, optimize assay conditions, and generate mechanistic data relevant to enzyme characterization and inhibitor profiling in applied research.
2. Peptide Coupling Intermediate
L-Arginine 4-nitroanilide dihydrobromide serves as an amino acid derivative intermediate for synthetic organic chemistry routes that require an arginine-derived protected or activated functionality for downstream assembly. The compound contains an amide at the α-carboxylate position (arginine 4-nitroanilide), and the guanidinium group remains a distinct, strongly basic site that can be selectively managed through salt formation and orthogonal protection strategies during peptide coupling planning. The aromatic 4-nitroanilide can be retained as a diagnostic or removable auxiliary depending on the synthetic sequence, enabling construction of arginine-containing peptide analogs and amide-linked fragments. The chiral L-configuration at the amino acid center supports stereochemically defined building-block incorporation into peptide-like structures, aligning with peptide coupling chemistry used in research-grade and fine chemical synthesis.
3. Chemical Biology Probe Design
L-Arginine 4-nitroanilide dihydrobromide is suitable for chemical biology workflows that leverage arginine-side-chain recognition combined with a nitroanilide reporter for monitoring molecular events. The guanidinium group provides a strong hydrogen-bonding and electrostatic interaction pattern characteristic of arginine-rich motifs, supporting use in substrate-mimic design, binding studies, and probe scaffolds for receptor or enzyme recognition. The 4-nitroanilide chromophore enables spectroscopic tracking, and the dihydrobromide salt form can be used to tune protonation-dependent behavior during interaction assays. The resulting probe derivatives can be further elaborated into labeled or conjugatable arginine analogs for studying molecular recognition, transport-like interactions, and catalytic site preferences in biochemical research.
4. Analytical Standard And Method Development
L-Arginine 4-nitroanilide dihydrobromide is used as an analytical reference material and method-development compound for chromatographic and spectrophotometric workflows involving arginine-derived amide motifs. The nitroanilide aromatic system provides a strong UV-Vis signature that supports calibration, identity verification, and monitoring of reaction mixtures where arginine amide formation or cleavage is tracked. The defined stereochemistry and salt form help establish reproducible retention and ionization behavior, supporting method transfer between analytical platforms used in research laboratories and industrial quality control environments. The compound can also serve as a benchmark substrate in analytical characterization of enzymatic processes where arginine recognition and amide cleavage are evaluated by reporter readout.
5. Pharmaceutical Intermediate Manufacturing
L-Arginine 4-nitroanilide dihydrobromide can be applied in pharmaceutical intermediate preparation where arginine-derived amide building blocks are required for controlled synthesis of peptide-like intermediates or side-chain functional fragments. The molecule's amide functionality and chiral amino acid framework support integration into larger synthetic sequences that build C-N linked structures, while the guanidinium group can be managed through salt handling and orthogonal protection/deprotection logic during process design. The nitroanilide reporter group may further enable in-process monitoring of intermediate formation or conversion steps by spectroscopic detection, aligning with practical manufacturing analytics. The dihydrobromide form can influence solubility and handling characteristics, supporting robust material preparation for downstream fine chemical synthesis and controlled assembly of arginine-containing motifs.
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