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G-Quadruplex Guanosine Gels and Single Walled Carbon Nanotubes
Department of Chemistry and Chemical Biology, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
* Author to whom correspondence should be addressed.
Received: 7 November 2013; in revised form: 25 November 2013 / Accepted: 3 December 2013 / Published: 11 December 2013
Abstract: Solubilization of single walled carbon nanotubes (SWNTs) in aqueous gel phases formed by reversible, G-quadruplex self-assembly of guanosine monophosphate (GMP) alone or with guanosine (Guo) is described. Unlike other media and methods for aqueous solubilization of SWNTs, the guanosine gels (“G-gels”) are found to readily disperse high (>mg/mL) concentrations of individual rather than bundled SWNTs. SWNT dispersions in GMP alone precipitate in several hours and re-form upon shaking; however, dispersions in the binary GMP/Guo gels are indefinitely stable. Increasing GMP or KCl concentration in the binary gels increased the relative abundance of large diameter and semi-conducting SWNTs. Different gel compositions also displayed different selectivities toward SWNTs of different chiralities. These results indicate a strong connection between the self-assembled G-gels and the dimensions and structures of the SWNTs that they solubilize.
Keywords: G-quadruplex; guanosine gel; guanosine tetrad; guanosine monophosphate; single-walled carbon nanotubes
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MDPI and ACS Style
Yu, Y.; Pushparaj, V.L.; Nalamasu, O.; McGown, L.B. G-Quadruplex Guanosine Gels and Single Walled Carbon Nanotubes. Molecules 2013, 18, 15434-15447.
Yu Y, Pushparaj VL, Nalamasu O, McGown LB. G-Quadruplex Guanosine Gels and Single Walled Carbon Nanotubes. Molecules. 2013; 18(12):15434-15447.
Yu, Yuehua; Pushparaj, Victor L.; Nalamasu, Omkaram; McGown, Linda B. 2013. "G-Quadruplex Guanosine Gels and Single Walled Carbon Nanotubes." Molecules 18, no. 12: 15434-15447.