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Supramolecular Ultrathin Film Strategies for DNA Assemblies: Substrates for Optobioelectronics, Gene Therapy, and Microarrays

Published online by Cambridge University Press:  21 March 2011

Rigoberto C. Advincula ,
Yingfan Wang ,
Mi-Kyoung Park ,
Gautam Bhatia ,
Seth Stepleton ,
Cara Monroe ,
Iman Shelton ,
Wally Blanton  and
Xiaowu Fan
Rigoberto C. Advincula
Affiliation:
Department of Chemistry, University of Alabama at Birmingham Birmingham, AL 35294-1240
Yingfan Wang
Affiliation:
Department of Chemistry, University of Alabama at Birmingham Birmingham, AL 35294-1240
Mi-Kyoung Park
Affiliation:
Department of Chemistry, University of Alabama at Birmingham Birmingham, AL 35294-1240
Gautam Bhatia
Affiliation:
Department of Chemistry, University of Alabama at Birmingham Birmingham, AL 35294-1240
Seth Stepleton
Affiliation:
Department of Chemistry, University of Alabama at Birmingham Birmingham, AL 35294-1240
Cara Monroe
Affiliation:
Department of Chemistry, University of Alabama at Birmingham Birmingham, AL 35294-1240
Iman Shelton
Affiliation:
Department of Chemistry, University of Alabama at Birmingham Birmingham, AL 35294-1240
Wally Blanton
Affiliation:
Department of Chemistry, University of Alabama at Birmingham Birmingham, AL 35294-1240
Xiaowu Fan
Affiliation:
Department of Chemistry, University of Alabama at Birmingham Birmingham, AL 35294-1240
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Abstract

We describe our strategies and results in the preparation of supramolecularly ordered ultrathin films of DNA assemblies using the layer-by-layer (LbL) alternate polyelectrolyte adsorption technique. The properties of DNA are intimately associated with their polyelectrolyte behavior in solution. Deposition at interfaces is governed by conformation, orientation, and charge density of these biomolecules in relation to the physisorption phenomena in oppositely charged surfaces. Thus, controlling the nature of surfaces (polymer charge density, ionic strength, other non-covalent interactions, etc.) is important in modifying the adsorption phenomena. In this work, differences in adsorption and incorporation of DNA with dyes, linear polymers and dendrimers are highlighted. A number of surface sensitive spectroscopic and microscopic techniques were used to probe the adsorption and multilayer assembly phenomena, e.g. surface plasmon resonance spectroscopy (SPS), AFM, quartz crystal microbalance (QCM) and ellipsometry. These studies are important for future applications such as the use of polycations as non-viral gene transfection vectors for drug-delivery and DNA adsorption on microarray surfaces. By combining with the alternate assembly of azobenzene and phthalocyanine dyes, we have been able to prepare optobiolelectronic substrates where the phenomena of irradiation and electrochemistry can be used to probe the ordering and response of these films.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 679: Symposium B – Molecular and Biomolecular Electronics , 2001 , B5.5
Copyright
Copyright © Materials Research Society 2001

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References

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