Abstract
Batch calorimetry, differential scanning calorimetry (DSC), uv/vis absorption spectroscopy, fluorescence spectroscopy, and circular dichroism (CD), have been used to detect, monitor, and thermodynamically characterize the binding of daunomycin, dipyrandenium, dipyrandium, and netropsin to poly d(AT) and actinomycin D to salmon testes (ST) DNA. The following thermodynamic binding profiles have been obtained. (table; see text) All the poly d(AT) binding studies were done at 25 degrees C while actinomycin binding to ST DNA was performed at 1 degree C to enhance drug solubility. These thermodynamic parameters are interpreted in terms of specific interactions that have been proposed as part of models for the binding of each drug.
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