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New Findings on DNA Research from Shanghai Jiao-Tong University Summarized (Growth of optically active chiral inorganic films through DNA...

July 11, 2014



New Findings on DNA Research from Shanghai Jiao-Tong University Summarized (Growth of optically active chiral inorganic films through DNA self-assembly and silica mineralisation)

By a News Reporter-Staff News Editor at Science Letter -- Investigators publish new report on DNA Research. According to news reporting out of Shanghai, People's Republic of China, by NewsRx editors, research stated, "The circularly polarized reflection of nature is due to their distinct azimuthally twisted or helical character in the nanostructure of the surface films. Although many chiral inorganic powders have been successfully synthesised, the artificial synthesis of chiral inorganic films is rare."

Our news journalists obtained a quote from the research from Shanghai Jiao-Tong University, "Herein, we reported a facile synthetic route for the growth of monolayered chiral film on the quaternary ammonium-modified silicon substrate. The films grew on the substrate surface because of the strong electrostatic interaction between positively charged quaternary ammonium groups and negatively charged phosphate groups of DNA, with subsequent growth to right-handed, vertically aligned, impeller-like helical architectures with left-handed two-dimensional square p4mm-structured DNA chiral packing. The DNA-silica composite films exhibited strong optical activity at 295?nm and in the range of 400-800?nm, corresponding to DNA chiral packing (absorption) and to the helical blade in the impeller (scattering), respectively. Upon removal of DNA templates, the pure inorganic impeller-like helical morphology was maintained; consequently, the scattering-based optical response was blue-shifted approximately 200?nm as a result of a decrease in the effective average refractive index."

According to the news editors, the research concluded: "The hierarchical structures were reflected from the surfaces by cross-polarised light, which confirmed that the films were strongly birefringent, with long-range anisotropy."

For more information on this research see: Growth of optically active chiral inorganic films through DNA self-assembly and silica mineralisation. Scientific Reports, 2014;4():4866. (Nature Publishing Group - www.nature.com/; Scientific Reports - www.nature.com/srep/)

Our news journalists report that additional information may be obtained by contacting B. Liu, School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, People's Republic of China. Additional authors for this research include L. Han, Y. Duan, Y. Cao, J. Feng, Y. Yao and S. Che (see also DNA Research).

Keywords for this news article include: Asia, Shanghai, Chemicals, Chemistry, DNA Research, Quaternary Ammonium, People's Republic of China.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Science Letter


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