Abstract
Impurities of free aromatic amino acids (Phe and Tyr) and the elastin protein were found in the heparin commercial drug (Hep) by spectral luminescent and spectrophotometric methods. The fluorescence quenching of the Trp, Tyr, and Phe amino acids by the Hep drug was studied, and the Stern-Folmer constants (K) that reflected stability of the Hep complexes with amino acids were determined. The stability of AA-Hep complexes increased in the following sequence: Trp < Tyr < Phe (K = 19 ± 2 < 39 ± 3 < 710 ± 70 M−1, respectively). These values probably determined the dominant contribution of the phenylalanine impurity in the heparin drug. The contamination of animal elastin whose structure differed from that of the human elastin is thought to be a reason for allergic reactions and even anaphylactic shock during medical treatment with this drug.
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Abbreviations
- AA:
-
amino acid
- FL:
-
fluorescence
- Hep:
-
heparin
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Original Russian Text © S.S. Ostakhov, V.M. Yunusov, M.V. Sultanbaev, G.Kh. Akhmadeeva, M.S. Yunusov, 2013, published in Bioorganicheskaya Khimiya, 2013, Vol. 39, No. 1, pp. 55–60.
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Ostakhov, S.S., Yunusov, V.M., Sultanbaev, M.V. et al. Studies of fluorescent components of the “heparin” drug and its complexing with phenylalanine, tyrosine, and tryptophan. Russ J Bioorg Chem 39, 48–52 (2013). https://doi.org/10.1134/S1068162013010093
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DOI: https://doi.org/10.1134/S1068162013010093