Abstract
The interactions of Cu(II), Zn(II), and Al(III) with 1,6-dimethyl-4-hydroxy-3-pyridinecarboxylic acid (DQ716) and 2,6-dimethyl-3-hydroxy-4-pyridinecarboxylic acid (DT726), possible chelating agents in Alzheimer’s disease, were investigated in aqueous solution. The proton dissociation constants of the ligands, the stability constants, and the coordination modes of the metal complexes formed were determined by pH-potentiometric, UV–vis spectrophotometric, and 1H NMR methods. The nitrogen of the pyridine ring changes the proton affinity of the carboxylate and phenolate moieties and these pyridine derivatives form stronger complexes with Cu(II), Zn(II), and Al(III) than salicylic acid. Interactions of the ligands with human serum albumin as their potential transporter in blood were investigated at physiological pH through ultrafiltration by UV-Vis and fluorescence spectroscopy.
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Acknowledgments
The work was made in the frame of the CNR-HAS Bilateral Research Program, and was also supported by the Hungarian Research Funds (TêMOP 4.2.1/B. and OTKA K77833). This paper was also supported by the János Bolyai Research Scholarship of the Hungarian Academy of Sciences (TJ). The project named "TêMOP-4.2.1/B-09/1/KONV-2010-0005 – Creating the Center of Excellence at the University of Szeged" is supported by the European Union and co-financed by the European Regional Fund.
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Sija, É., Dean, A., Jakusch, T., Di Marco, V.B., Venzo, A., Kiss, T. (2012). Interactions of pyridinecarboxylic acid chelators with brain metal ions: Cu(II), Zn(II), and Al(III). In: Linert, W., Kozlowski, H. (eds) Metal Ions in Neurological Systems. Springer, Vienna. https://doi.org/10.1007/978-3-7091-1001-0_17
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