L-Glutamine is a proteinogenic amino acid classified as a neutral, polar side-chain glutamine derivative, featuring an α-amino group and a carboxyl group on the backbone with a side chain that terminates in a primary amide. The molecule is present as the L stereoisomer and bears the side-chain amide functionality capable of hydrogen-bonding and acting as a polar interaction site, while the amino and carboxyl groups can exist in zwitterionic forms depending on pH. L-Glutamine is used as a free amino acid building block for peptide and amide-containing derivative synthesis and as a substrate or reference material in analytical methods that distinguish amide-bearing amino acids.
CAT No: CP00802
CAS No:56-85-9
Synonyms/Alias:L-asparticacid;56-84-8;asparticacid;(S)-2-Aminosuccinicacid;H-Asp-OH;Asparagicacid;L-aspartate;Asparaginicacid;L-Asparaginicacid;(S)-Asparticacid;L-Asparagicacid;L-Aminosuccinicacid;(2S)-Asparticacid;aspartate;(S)-Aminobutanedioicacid;Aspatofort;(2S)-2-aminobutanedioicacid;L-Aspartinsaeure;L-Asparaginsaeure;Asparticacid,L-;L-Asparaginsyra;Acidumasparticum;L-(+)-Asparticacid;L-2-Aminobutanedioicacid;(+)-Asparticacid
L-Glutamine is the naturally occurring L-amide of glutamic acid, featuring a stereogenic center at the alpha carbon and a side chain bearing a primary amide group that is highly polar and capable of hydrogen bonding. The molecule contains an amino functionality and a carboxylic acid, which together enable salt formation and controlled reactivity depending on pH and derivatization state. As an amino acid with an amide side chain rather than a carboxylate, L-glutamine participates in peptide chemistry through its alpha-amino and alpha-carboxyl groups while presenting a side-chain handle for further functionalization, including conversion to protected derivatives or activation for downstream synthetic steps. The combination of chiral amino acid stereochemistry and an unprotected amide side chain makes L-Glutamine a practical research and manufacturing feedstock for amino acid derivatization and peptide-related intermediate preparation.
1. Peptide Coupling
L-Glutamine is applied in peptide synthesis workflows where the alpha-amino and carboxyl functionalities enable incorporation as a glutamine residue in protected amino acid building block strategies. The side-chain primary amide can be retained for direct glutamine-containing peptide assembly or temporarily masked through protection approaches compatible with standard peptide coupling chemistry, supporting selective deprotection at the desired stage. L-Glutamine's stereochemical integrity at the alpha carbon supports predictable amide bond formation and consistent residue geometry in linear peptide scaffolds. Downstream use includes generating glutamine-containing peptides for biochemical assays, peptide standards, and synthetic intermediates that require a defined glutamine motif.
2. Chemical Biology Studies
L-Glutamine is used in chemical biology and metabolite-mimicking research where its amide side chain enables targeted derivatization for probe construction and biochemical interaction studies. The polar glutamine functionality can be transformed into labeled or functionalized analogs that participate in recognition processes involving amino acid transport, enzyme binding, or metabolic pathway modeling. Side-chain modification strategies can support conjugation handles for affinity reagents, imaging probes, or immobilized ligands while maintaining the L-configuration that often governs molecular recognition. Resulting derivatives can serve as research intermediates for studying amino acid-dependent pathways, enzyme substrate specificity, and molecular recognition in complex biological systems.
3. Protein Engineering Inputs
L-Glutamine is relevant to protein engineering and synthetic biology as a chiral amino acid component for building defined glutamine-containing sequences in recombinant and cell-free expression contexts. The alpha-amino acid framework supports incorporation into peptides and protein segments, while the side-chain amide can participate in hydrogen-bond networks that influence local structure and intermolecular interactions. Derivatization of L-glutamine into protected or activated forms can enable controlled synthesis of glutamine-rich peptides used for domain mapping, binding assays, or structural studies of glutamine-dependent interfaces. Downstream applications include producing sequence-defined materials and peptide fragments that function as inputs for protein interaction analysis and engineered biomolecule characterization.
4. Amino Acid Derivatization
L-Glutamine is employed in amino acid derivatization chemistry to generate protected amino acid derivatives, activated intermediates, and functionalized glutamine analogs for broader synthetic use. The unprotected side-chain amide can be selectively protected to prevent undesired reactivity during peptide coupling, esterification, or carbonyl activation steps, enabling orthogonal protection schemes that align with multi-step synthesis. The alpha-carboxyl and alpha-amino groups can be converted into salts, esters, or coupling-ready forms to support controlled downstream transformations. Resulting products include intermediates for peptidomimetic construction, heteroatom-functionalized scaffolds, and process-ready feedstocks for fine chemical synthesis.
5. Pharmaceutical Manufacturing Intermediates
L-Glutamine is used in pharmaceutical manufacturing and industrial fine chemical production as a chiral starting material for generating glutamine-containing intermediates and peptide-related components used in upstream synthesis planning. The molecule's amino acid functionality supports conversion into protected forms that can be handled under manufacturing conditions where selective reactivity and predictable deprotection timing are required. Side-chain amide chemistry can be leveraged to produce defined glutamine residues or glutamine-derived fragments that feed into larger synthetic sequences for active pharmaceutical ingredient precursors or process intermediates. Downstream utility includes supplying stereochemically consistent amino acid building blocks for controlled assembly of peptide analogs and related heteroatom-rich intermediates.
6. Analytical Standards And Labeling
L-Glutamine is suitable for analytical research and isotope-labeling workflows where defined stereochemistry and the side-chain amide provide a stable reference for method development and quantitation. The functional groups enable formation of salts or derivatized standards that improve chromatographic behavior and support detection strategies in amino acid profiling. Side-chain derivatization can also support formation of reporter derivatives for mass spectrometric characterization while retaining the core glutamine structure needed for accurate calibration. Broader relevance includes generating analytical reference materials and labeled glutamine intermediates that support biochemical measurement, metabolic studies, and quality control of amino acid-containing synthetic products.
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