The study of genomic DNA adsorption and subsequent interactions using total internal reflection ellipsometry

NABOK, A. V., TSARGORODSKAYA, A., DAVIS, F. and HIGSON, S. P. J. (2007). The study of genomic DNA adsorption and subsequent interactions using total internal reflection ellipsometry. Biosensors and Bioelectronics, 23 (3), 377-383.

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Link to published version:: 10.1016/j.bios.2007.04.020

Abstract

The adsorption of genomic DNA and subsequent interactions between adsorbed and solvated DNA was studied using a novel sensitive optical method of total internal reflection ellipsometry (TIRE), which combines spectroscopic ellipsometry with surface plasmon resonance (SPR). Single strands of DNA of two species of fish (herring and salmon) were electrostatically adsorbed on top of polyethylenimine films deposited upon gold coated glass slides. The ellipsometric spectra were recorded and data fitting utilized to extract optical parameters (thickness and refractive index) of adsorbed DNA layers. The further adsorption of single stranded DNA from an identical source, i.e. herring ss-DNA on herring ss-DNA or salmon ss-DNA on salmon ss-DNA, on the surface was observed to give rise to substantial film thickness increases at the surface of about 20-21 nm. Conversely adsorption of DNA from alternate species, i.e. salmon ss-DNA on herring ss-DNA or herring ss-DNA on salmon ss-DNA, yielded much smaller changes in thickness of 3-5 nm. AFM studies of the surface roughness of adsorbed layers were in line with the TIRE data. (c) 2007 Elsevier B.V. All rights reserved.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre > Electronic Materials and Sensors Research Group
Identification Number: 10.1016/j.bios.2007.04.020
Depositing User: Ann Betterton
Date Deposited: 31 Mar 2010 17:13
Last Modified: 31 Mar 2010 17:13
URI: http://shura.shu.ac.uk/id/eprint/1441

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