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Biochemical Synthesis and Unusual Conformational Switching of a Molecular Complex of Polyaniline and DNA

Published online by Cambridge University Press:  10 February 2011

Ramaswamy Nagarajan
Affiliation:
Department of Chemistry and Physics, Center for Advanced Materials, University of Massachusetts Lowell, Lowell MA 01854
Sukant K. Tripathy
Affiliation:
Department of Chemistry and Physics, Center for Advanced Materials, University of Massachusetts Lowell, Lowell MA 01854
Jayant Kumar
Affiliation:
Department of Chemistry and Physics, Center for Advanced Materials, University of Massachusetts Lowell, Lowell MA 01854
Lynne A. Samuelson
Affiliation:
Natick Soldier Center, U.S. Army Soldier & Biological Chemical Command, Natick, MA 01760
Ferdinando F. Bruno
Affiliation:
Department of Chemistry and Physics, Center for Advanced Materials, University of Massachusetts Lowell, Lowell MA 01854 Natick Soldier Center, U.S. Army Soldier & Biological Chemical Command, Natick, MA 01760
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Abstract

Polyaniline (Pani) is one of the most interesting conducting polymers because of its promising electrical properties and unique redox tunability. Recently a new template assisted, enzymatic synthetic approach has been developed which yields a water-soluble and conducting complex of polyaniline and the template used. The mild reaction conditions in this approach allow for the utilization of delicate biological systems as template materials, such as DNA. Here we report the extension of this enzymatic approach to the synthesis of Pani on a DNA matrix. DNA serves as a suitable template for complexation and formation of conducting polyaniline. The redox behavior of Pani induces reversible conformational change in the secondary structure of DNA. Circular dichroism results suggest that the secondary structure of the DNA may be reversibly switched through manipulation of the redox state of the polyaniline.

Type
Research Article
Copyright
Copyright © Materials Research Society 2000

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