Publication date: 10th April 2014
Gold nanoparticles of different sizes and shapes have been successfully used for multiphoton fluorescence imaging. Due its low emission efficiency (multiphoton excitation) these nanoparticles are particularly suitable for photothermal therapy. For real in vivo applications these nanoheaters must be designed with their plasmonic absorption bands matching the biological windows (700-1400 nm). This spectral requirement prevents the use of solid gold nanospheres as useful photothermal agents, as their plasmon resonances can only be tuned up to the visible spectral region by varying its size. Indeed, rod shaped gold nanoparticles (Gold Nano Rods, GNRs), with plasmon resonance around 800 nm have been reported to be one of the most suitable nanoheaters for real in vivo photothermal therapy1. However, the non-spherical shape of the nanoparticles difficulties their cellular uptake and it has aimed to search for novel spherical gold nanostructures with plasmon resonances around 800 nm. In this work we have synthesized nearly monodisperse hollow gold nanospheres (HGNSs) and characterized them as nanoheaters operating under laser excitation in the biological window. The hollow interior of these gold nanoparticles provides the possible additional advantage of drug incorporation and so potentiality for drug delivery. The plasmonic extinction band of HGNSs is much broader than the longitudinal plasmon extinction band of GNRs at similar plasmon resonance , thus giving a better chance for tunability in respect to GNRs. First ex vivo photothermal experiments carried out on chicken breast and pork tissues have shown the capability of HGNSs for photothermal therapy. Experiments to determine the light to heat efficiency are under way and will be presented during the conference time.
1.- Laura M. Maestro, Patricia Haro-González, Ana Sánchez-Iglesias, Luis M. Liz-Marzán, J. García Solé and Daniel Jaque. “Quantum dot thermometry evaluation of geometry dependent heating efficiency in gold nanoparticles”. Langmuir dx.doi.org/10.1021/la403435v (2014).
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