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Isotope Labeling

      Isotope labeled peptides are synthesized by amino acids containing isotope labeled amino acids. At present, C13, N15 isotope labeled amino acids are mainly used to synthesize isotope labeled amino acids in our company.
      Below lists is the most common stable isotopically labeled amino acids that can be used for the synthesis of peptides with stable isotopes containing carbon 13 (13C) and Nitrogen 15 (15N). Other labeled amino acids are available upon request.

  • Amino Acid

    Isotope

    Mass Difference

    Isotopic enrichment

    Alanine
    Ala(A)

    U-13C3,U-15N

    +4 da

    >99%

    Arginine
    Arg(R)

    U-13C6,U-15N4

    +10 da

    >99%

    Arginine
    Arg(R)

    4,4,5,5-13C

    +4 da

    >98%

    Isoleucine
    Ile(I)

    U-13C6,U-15N

    +7 da

    >99%

    Leucine
    Leu(L)

    U-13C6,U-15N

    +7 da

    >99%

    Lysine
    Lys(K)

    U-13C6,U-15N2

    +8 da

    >99%

    Proline
    Pro(P)

    U-13C5,U-15N

    +6 da

    >99%

    Phenyalanine
    Phe(F)

    U-13C9,U-15N

    +10da

    >99%

    Valine
    Val(V)

    U-13C5,U-15N

    +6 da

    >99%

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