Topographical and functional characterization of the ssDNA probe layer generated through EDC-mediated covalent attachment to nanocrystalline diamond using fluorescence microscopy
The covalent attachment method for DNA on nanocrystalline diamond (NCD), involving the introduction of COOH functionalities on the surface by photoattachment of 10-undecenoic acid (10-UDA), followed by the 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide (EDC)-mediated coupling to NH 2-labeled ssDNA,...
| Veröffentlicht in: | Langmuir : the ACS journal of surfaces and colloids. - 1991. - 24(2008), 16 vom: 19. Aug., Seite 9125-34 |
|---|---|
| 1. Verfasser: | |
| Weitere Verfasser: | , , , , , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2008
|
| Zugriff auf das übergeordnete Werk: | Langmuir : the ACS journal of surfaces and colloids |
| Schlagworte: | Journal Article Research Support, Non-U.S. Gov't DNA, Single-Stranded Diamond 7782-40-3 Ethyldimethylaminopropyl Carbodiimide RJ5OZG6I4A |
| Zusammenfassung: | The covalent attachment method for DNA on nanocrystalline diamond (NCD), involving the introduction of COOH functionalities on the surface by photoattachment of 10-undecenoic acid (10-UDA), followed by the 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide (EDC)-mediated coupling to NH 2-labeled ssDNA, is evaluated in terms of stability, density, and functionality of the resulting biological interface. This is of crucial importance in DNA biosensor development. The covalent nature of DNA attachment will infer the necessary stability and favorable orientation to the ssDNA probe molecules. Using confocal fluorescence microscopy, the influence of buffer type for the removal of excess 10-UDA and ssDNA, the probe ssDNA length, the probe ssDNA concentration, and the presence of the COOH-linker on the density and functionality of the ssDNA probe layer were investigated. It was determined that the most homogeneously dense and functional DNA layer was obtained when 300 pmol of short ssDNA was applied to COOH-modified NCD samples, while H-terminated NCD was resistant for DNA attachment. Exploiting this surface functionality dependence of the DNA attachment efficiency, a shadow mask was applied during the photochemical introduction of the COOH-functionalities, leaving certain regions on the NCD H-terminated. The subsequent DNA attachment resulted in a fluorescence pattern corresponding to the negative of the shadow mask. Finally, NCD surfaces covered with mixtures of the 10-UDA linker molecule and a similar molecule lacking the COOH functionality, functioning as a lateral spacer, were examined for their suitability in preventing nonspecific adsorption to the surface and in decreasing steric hindrance. However, purely COOH-modified NCD samples, patterned with H-terminated regions and treated with a controlled amount of probe DNA, proved the most efficient in fulfilling these tasks |
|---|---|
| Beschreibung: | Date Completed 17.09.2008 Date Revised 21.11.2013 published: Print-Electronic Citation Status MEDLINE |
| ISSN: | 0743-7463 |
| DOI: | 10.1021/la800946v |