The interactions of two kinds of water-soluble porphyrins, Cu (NEAE) andH2PPS, with DNA have been investigated by microcajorimetry and UV spectroscopy.The experimental results show that Cu (NEAE) interact with dsDNA in the outside-boundmode, its binding number is 9～10 base pairs and its binding enthalpy △H＝-24．4kJ．mol-1.There are large enthalpy changes when Cu (NEAE) react with ssDNA. H2PPS can notreact with both dsDNA and ssDAN, which demonstrats that the coulombic force is one ofthe important factors affecting the interactions of porphyrins with DNA.
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