Absorption and circular dichroic spectral studies on the self‐association of daunorubicin

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Abstract
The self‐association of daunorubicin in aqueous solution has been examined using visible absorption, fluorescence, and CD measurements. Spectral changes in the concentration range 10−6 to 1.5 × 10−3M have been interpreted in terms of a monomer–dimer equilibrium for daunorubicin. The data have been analyzed using a nonlinear curve‐fitting technique. The results obtained in this study differ markedly from previously published results, and possible reasons for this difference are discussed. The effect of solvent, temperature, and ionic strength on the dimerization process is investigated.