Dendrislides, dendrichips: a simple chemical functionalization of glass slides with phosphorus dendrimers as an effective means for the preparation of biochips
- 15 September 2003
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in New Journal of Chemistry
- Vol. 27 (12), 1713-1719
- https://doi.org/10.1039/b307928g
Abstract
Materials with tailored surface properties are useful for diverse applications, in particular for adsorption and/or covalent immobilization of various biomolecules such as nucleic acids and proteins. One of the main challenges is to design a reactive surface chemistry for stable binding of biomolecules on the support, which in addition keeps away the biomolecules from the support to reduce interference. We report here a novel support functionalization that is based on the formation of a reactive layer, covalently grafted on glass slides onto which amino-modified DNA probes were covalently fixed. The layer is composed of spherical home-made neutral phosphorus dendrimers containing a large number of aldehyde functions at their periphery. The method of preparation of these dendrimer-activated glass slides (so-called dendrislides) is performed in a few steps and results in stable activated supports, since aldehyde dendrimers are stable compounds. After immobilization of nucleic acids the so-called dendrichip products were investigated by means of hybridization experiments using complementary fluorescent labelled-oligonucleotide targets. Our results indicate that this novel grafting technology leads to surfaces with a high binding capacity for amino-modified oligonucleotides compared to commercially available aldehyde slides and with a detection limit of 1 pM labelled targets. Since links between the surface, the dendrimers and the nucleic acids are covalent, the dendrichips could be re-used up to 10 times without significant change in the fluorescence signal intensity. Finally, the performance of dendrichips in detection of a single base mutation was demonstrated.Keywords
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