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Proceedings Paper

Surface characterization of oligonucleotides immobilized on polymer surfaces
Author(s): Duy K. Pham; Elena P Ivanova; Jonathan P. Wright; Piotr A. Grodzinski; Ralf Lenigk; Dan V. Nicolau
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Paper Abstract

The immobilization and hybridization of amino-terminated oligonucleotide strands to cyclo-olefin-copolymer (COC) and polycarbonate (PC) surfaces have been investigated for potential application in micro-PCR devices. The oligonucleotides were covalently bound to the plasma-treated COC and PC surfaces via an N-hydroxy-sulfosuccinimide (NHSS) intermediate. Analysis by AFM showed that the oligonucleotides were present on the surfaces as lumps, and that the size, both vertically and laterally, of these lumps on the COC surface was larger compared to the PC surface. The immobilization efficiency of the former was also higher (15.8 x 1012 molecules / cm2) compared to the latter (3.3 x 1012 molecules / cm2). The higher efficiency of the COC surface is attributed to the more effective NHSS-functionalization and its higher surface roughness. Subsequent hybridization doubled the height of the lumps, while the lateral dimensions remained essentially unchanged. This is explained in terms of organization of the long probe strands used on the surface as flexible, coil-like polymer chains, which allow the complementary oligonucleotides to bind and increase the height of the lumps. The AFM frictional images showed that the hybridization had the effect of reversing hydrophilicity of the oligonucleotide lumps from being more hydrophilic to more hydrophobic, consistent with the hydrophilic bases of the probe strands being shielded as a result of hybridization.

Paper Details

Date Published: 14 November 2002
PDF: 10 pages
Proc. SPIE 4937, Biomedical Applications of Micro- and Nanoengineering, (14 November 2002); doi: 10.1117/12.471946
Show Author Affiliations
Duy K. Pham, Swinburne Univ. of Technology (Australia)
Elena P Ivanova, Swinburne Univ. of Technology (Australia)
Jonathan P. Wright, Swinburne Univ. of Technology (Australia)
Piotr A. Grodzinski, Motorola Physical Sciences Labs. (United States)
Ralf Lenigk, Motorola Physical Sciences Labs. (United States)
Dan V. Nicolau, Swinburne Univ. of Technology (Australia)

Published in SPIE Proceedings Vol. 4937:
Biomedical Applications of Micro- and Nanoengineering
Dan V. Nicolau, Editor(s)

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