Association of DNA with poly(N-vinylpyrrolidone)-C 60 complex in D 2 O

The interaction of DNA with a poly(N-vinylpyrrolidone)–C60 complex in D2O has been studied by SANS at physiological temperatures T=20 °C and 40 °C. On increasing the concentration of the complex (C=0.1-1.0 wt. %) at a constant DNA content (C*=0.1 wt. %), we observed a progressive complex association with DNA, while the PVP revealed the opposite behaviour (maximum association at C=0.5 wt. %). Complexes clustering with DNA (gyration radius of the associates RG∼15–30 nm) are more pronounced at 40 °C.