This study focuses on the interaction between methotrexate and human hemoglobin using steady-state ultraviolet-visible and fluorescence quenching methods. Fluorescence quenching was found to be valuable in assessing drug binding to hemoglobin. The quenching of methotrexate is slightly smaller than the quenching observed with related analogs (dihydrofolate and tetrahydrofolate). The quenching studies were performed at four different temperatures and various pH values. The number of binding sites for tryptophan is ~1. Parameter-dependent assays revealed that electrostatic forces play an essential role in the methotrexate–hemoglobin interaction. Furthermore, the complex was easily eluted using gel filtration chromatography.
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Published in Zhurnal Prikladnoi Spektroskopii, Vol. 82, No. 2, pp. 284–291, March–April, 2015.
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Zaharia, M., Gradinaru, R. Interaction of Human Hemoglobin with Methotrexate. J Appl Spectrosc 82, 278–285 (2015). https://doi.org/10.1007/s10812-015-0098-8
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DOI: https://doi.org/10.1007/s10812-015-0098-8