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Complexation Constants of Ubiquinone,0 and Ubiquinone,10 with Nucleosides and Nucleic Acid Bases

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Complexation Constants of Ubiquinone,0 and Ubiquinone,10 with Nucleosides and Nucleic Acid Bases

Kassim Y. Rahawi and Muthana Shanshal

Department of Chemistry, College of Science, University of Baghdad, Jadiriya, Baghdad, Iraq Reprint requests to Prof. M. S.; E-mail: mshanshal2003@yahoo.com

Z. Naturforsch.63a,114 – 120 (2008); received May 17, 2007

UV spectrophotometric measurements were done on mixtures of the ubiquinones Ub,0 and Ub,10 in their monomeric form (c<10−5 mol/l) with the nucleosides; adenosine, cytidine, 2-desoxy- adenosine, 2-desoxy-quanosine, guanosine and thymidine, as well as the nucleic acid bases; ade- nine, cytosine, hypoxanthine, thymine and uracil. Applying the Liptay method, it was found that both ubiquinones form 1 : 1 interaction complexes with the nucleic acid components. The complex- ation constants were found in the order of 105 mol−1. The calculated ∆Gvalues were negative (∼ −7.0 kcal/mol), suggesting a favoured hydrogen bridge formation. This is confirmed by the pos- itive change of the entropy ∆S. The complexation enthalpies∆Hfor all complexes are negative, suggesting exothermal interactions.

Key words:Ubiquinones; Nucleosides; Complexation; UV Spectra.

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