A new method has been investigated for the functionalization of gold nanoparticles with DNA. Silica-coated nanoparticles functionalized with a maleimide have been prepared. These particles are designed to react with modified DNA containing a diene functionality at one end of the molecule. The result would be the formation of a more stable attachment of the DNA to the particle through a Diels-Alder reaction. This covalent attachment would not be susceptible to ligand exchanges, which are known to occur in the conventional DNA functionalization of gold nanoparticles.
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Proupín-Pérez et al. (2005) studied this question.
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