Abstract
Standard free energies (ΔG o t ) and entropies (ΔS o t ) of transfer of some DNA and RNA bases, viz., uracil (U), thymine (T), cytosine (C), and adenine (A) from water to aqueous mixtures of urea (UH) and glycerol (GL) have been evaluated from solubility measurements at different temperatures. The observed ΔG o t and TΔS o t vs composition profiles are complicated because of the interaction effects. Elimination of the cavity effect obtained by using scaled particle theory and effects due to dipole-dipole, dipole-induced dipole, and dispersion interactions yielded the corresponding effects as guided by the hydrophilic and hydrophobic sites of the solutes with the components of the solvent mixtures as compared to that in water
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