Complex formation of aromatic biologicaly active compounds with antibiotic topotecan: analysis by means of 1h nuclear magnetic resonance spectroscopy
Abstract
In the present work with use of 1H NMR spectroscopy data the analysis of heteroassociation of antibiotic
topotecan (TPT) with aromatic biologically active compounds (BAC): caffeine, mutagens ethidium
bromide and proflavine, antibiotic daunorubicin, vitamins flavin-mononucleotide and nicotinamide, is
carried out. The analysis was performed taking into account the existence of the antibiotic in aqueous
environment under physiological pH in two various forms – lactone and carboxylate. Equilibrium
constants of heteroassociation and induced chemical shifts of TPT protons (in lactone and carboxylate
forms) and the BACs within the complexes were obtained. It is found that the complex formation TPTBАС is characterized by the stacking of the chromophores and additionally stabilized in case of
proflavine by intermolecular hydrogen bond
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References
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