Journal of Biomaterials and Nanobiotechnology

Volume 2, Issue 4 (October 2011)

ISSN Print: 2158-7027   ISSN Online: 2158-7043

Google-based Impact Factor: 1.69  Citations  

A Dual Effect of Au-Nanoparticles on Nucleic Acid Cholesteric Liquid-Crystalline Particles

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DOI: 10.4236/jbnb.2011.24056    4,621 Downloads   8,282 Views  Citations

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ABSTRACT

Au-nanoparticles (size about 2 nm, but not 5 or 15 nm) are capable of effectively incorporating into quasinematic layers of particles of cholesteric liquid-crystalline dispersion formed by double-stranded nucleic acid molecules of various families (DNA and poly(I)xpoly(C)). This Au-size-dependent process is accompanied by a decrease in amplitudes of abnormal bands in the CD spectra specific to initial cholesteric liquid-crystalline dispersions and simultaneously by an appearance of plasmon resonance band in visible absorption spectrum. The study of properties of particles of cholesteric liquid-crystalline dispersion treated with Au-nanoparticles by means of various physico-chemical methods demonstrates that incorporation of Au-nanoparticles into quasinematic layers of these particles results in two effects: i) it facilitates reorganization of the spatial cholesteric structure of particles, and ii) it induces the formation of Au-clusters in the content of particles. It is not excluded that these effects represent a possible reason for genotoxicity of Au-nanopar- ticles.

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Y. Yevdokimov, S. Skuridin, V. Salyanov, V. Popenko, V. Rudoy, O. Dement′eva and E. Shtykova, "A Dual Effect of Au-Nanoparticles on Nucleic Acid Cholesteric Liquid-Crystalline Particles," Journal of Biomaterials and Nanobiotechnology, Vol. 2 No. 4, 2011, pp. 461-471. doi: 10.4236/jbnb.2011.24056.

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