Free Amino Acids

CIL offers a multitude of unlabeled and isotopically labeled free amino acids for use in MS- or NMR-based metabolomics, proteomics, and structural biology. The amino acids are canonical (e.g., arginine, lysine, phenylalanine) and noncanonical (e.g., beta-alanine, citrulline, ornithine) in grades of research and microbiological/pyrogen tested (MPT). They are available as uniformly or specifically labeled with carbon-13, nitrogen-15, deuterium, and oxygen-18 and are often used as metabolic tracers, internal standards, or NMR probes for structure and dynamics.

Related Resource

➤ Stable Isotope-Labeled Products for Metabolic Research

Stable Isotope Standards for Mass Spectrometry

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Stable Isotopes for Biomolecular NMR

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Product category

Isotope Label

Label Type

Isotopic Enrichment Range

Grade

Molecular Weight Range

Product Form

Product Form 2

Uniformly Labeled Amino Acids

CIL offers an array of uniformly labeled amino acids for use in MS- or NMR-based metabolomics and proteomics research. The amino acids are canonical (e.g., alanine, leucine, tyrosine) and noncanonical (e.g., beta-alanine, ornithine) in grades of research and microbiological/pyrogen tested (MPT), with the D-labels predominantly at nonexchangeable positions.

Partially Labeled Amino Acids

CIL offers a multitude of partially labeled amino acids and derivatives for use in MS- or NMR-based metabolomics and proteomics research. The amino acids are canonical (e.g., histidine, proline, threonine) and noncanonical (e.g., beta-alanine, citrulline, ornithine) in grades of research and microbiological/pyrogen tested (MPT), with the isotope labels of variable type (i.e., 13C, D, 15N, 18O) and position.

Unlabeled Amino Acids

CIL offers a variety of unlabeled amino acids (AAs). These are available in different forms (e.g., in chloride salt form) and material grades (i.e., research and microbiological/pyrogen tested, MPT).

Stable Isotope-Labeled Arginine

CIL offers a broad collection of isotope-enriched L-arginine (L-Arg) compounds for use in MS- or NMR-based metabolomics and proteomics research. This list encompasses uniform and partially labeled L-Arg, with the isotopes (13C, D, and/or 15N) at nonexchangeable positions.

Stable Isotope-Labeled Lysine

CIL offers isotope-enriched L-lysine (L-Lys) compounds for use in MS- or NMR-based metabolomics and proteomics research. This list encompasses uniform and partially labeled L-Lys, with the isotopes (13C, D, and/or 15N) at nonexchangeable positions. The material grade is research or microbiological/pyrogen tested (MPT).