Abstract
The dissociation constants of six common human and veterinary antibiotics, namely, erythromycin, roxithromycin, tilmicosin, oleandomycin, josamycin, and spiramycin in 15 %, 25 %, 40 % and 50 % (v/v) methanol–water solvent mixtures were determined by UV/pH titration and correlated with the Kamlet and Taft solvatochromic parameters, π ∗, α and β. Kamlet and Taft’s general equation was reduced to two terms by combined factor analysis and target factor analysis in these mixtures: the independent term and polarity/polarizability π ∗, which are solvatochromic parameters. The influence of methanol on the dissociation constants was investigated. Further, the quasi-lattice quasi-chemical (QLQC) model of preferential solvation has been applied to quantify the preferential solvation by water of electrolytes in methanol–water mixtures.
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The authors greatly acknowledge Dr. Jose L. Beltran from Universitat de Barcelona for kindly providing the spectral data processing software, STAR. Also, financial support of this project by Gazi University-BAP is gratefully acknowledged.
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Şanlı, S., Altun, Y. & Alsancak, G. Determination of the Dissociation Constants of Some Macrolide Antibiotics in Methanol–Water Binary Mixtures by UV-Spectroscopy and Correlations with the Kamlet and Taft Solvatochromic Parameters. J Solution Chem 41, 1352–1363 (2012). https://doi.org/10.1007/s10953-012-9868-6
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DOI: https://doi.org/10.1007/s10953-012-9868-6