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The synthesis and characterisation of a new anthracycline, 3′-azidodaunorubicin semicarbazone (ADNRS) is reported. The interaction between ADNRS and calf thymus DNA (ctDNA) was investigated by absorption and fluorescence spectroscopy in combination with melting temperature (Tm) curves and molecular modelling in physiological buffer (pH 7.4). Evidence indicates that ADNRS binds in the groove of ctDNA and the fluorescence quenching mechanism is a static quenching type. Calculated thermodynamic parameters show that hydrophobic interactions may play a predominant role in the binding. Furthermore, molecular modelling results corroborate the spectroscopic investigations.

Spectroscopic and Modelling Analysis on the Interaction of 3'-Azidodaunorubicin Semicarbazone with ctDNA