[Investigation of fluorescent components of drug "heparin" and its complexing with phenylalanine, tyrosine and tryptophan].

Abstract

Using spectral-luminescent and spectrophotometric methods a composition of aminoacidic (AA) and protein components of commercial drug of heparin (Hep) as well as its interaction with Trp, Tyr and Phe was studied. The impurities of aromatic aminoacids Phe, Tyr and elastin protein was revealed in drug of heparin. The quenching of fluorescence (FL) of Trp, Tyr and Phe with heparin was studied and the Stern-Volmer Constants (K) showing the stability of its complexes with aminoacids were determined. The stability of complexes AA...Hep increases in the series K (Trp...Hep) = 19 +/- 2 M(-1) < K (Tyr...Hep) = 39 +/- 3 M(-1) < K (Phe...Hep) = 710 +/- 70 M(-1), that, probably, determines dominating contribution of Phe impurity in heparin and the absence of that of tryptophan. It was assumed, that animal elastin, which is different from human one can provoke allergic reactions up to anaphylactic shock.