Imaging Science and Photochemistry ›› 2011, Vol. 29 ›› Issue (3): 181-193.DOI: 10.7517/j.issn.1674-0475.2011.03.181

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Synthesis of Isoalloxazine Modified C60-polypropylene Acid and Its Interaction with DNA

WANG Zhong-li, GAO Yun-yan, OU Zhi-ze, GUO Chuang-long, LI Hai-xia, JIN He-lin   

  1. Ministry of Education Key Laboratory of Space Applied Physics and Chemistry, School of Science, Northwestern Polytechnical University, Xi’an 710072, Shanxi, P. R. China
  • Received:2011-01-01 Revised:2011-03-28 Online:2011-05-23 Published:2011-05-23

Abstract: Poly(acrylic acid) conjugated fullerene(C60-PAA) is synthesized by free-radical polymerization.C60-PAA is covalently linked with riboflavin analogue 6,7-Dimethyl-9-(2’-hydroxyethyl)-isoalloxazine through esterification reaction,affording C60-PAA-DHIX.The products are characterized by Fourier transform infrared spectroscopy(FT-IR),proton nuclear magnetic resonance(1HNMR),UV-visible absorption spectroscopy(UV-Vis),and fluorescence spectroscopy.Cyclic voltammetry results show that the first reduction potential of fullerene moiety is higher than that of DHIX moiety in C60-PAA-DHIX.ESR results indicate that multi-step photoinduced electron-transfer processes may occur between C60-PAA-DHIX and N,N-dimethyl aniline under irradiation.One-electron transfer from N,N-dimethyl aniline to excited-state DHIX induces the generation of DHIX radical,followed by electron transfer from the DHIX radical to C60,forming the corresponding anion radical of C60(C60).The results obtained from DNA melting experiments,UV-Vis absorption and fluorescence spectra suggest that C60-PAA-DHIX could interact with CT DNA through groove binding mechanism.However,C60-PAA can only weakly interact with DNA.C60-PAA-DHIX exhibited stronger DNA photodamage ability on plasma DNA than C60-PAA under anaerobic condition.

Key words: fullerene polymer, isoalloxazine, photoinduced electron transfer, groove binding, DNA photocleavage

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