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Preparation of Light-responsive Membranes by a Combined Surface Grafting and Postmodification Process
Published on: March 21, 2014
Factors influencing polyelectrolyte-aptamer multilayered films with target-controlled permeability for sensing
Brian Malile1, Jennifer I L Chen1
1Department of Chemistry, York University, 4700 Keele Street, Toronto, ON, Canada M3J 1P3. jilchen@yorku.ca.
Abstract:
Portable, easy-to-use and cost-effective sensing devices are desirable in healthcare, environmental monitoring and food safety. Herein we employ polyelectrolyte-aptamer (PE-aptamer) multilayered films that exhibit target-responsive permeability for colorimetric and electrochemical sensing. We present the quantitative detection of an exemplary small molecule, quinine, and address the potential for detection in complex media by examining interference effects. We optimize the film composition and investigate the importance of the structural-switching ability of the aptamer. The results from both platforms are corroborated to provide an outlook on the applicability of the PE-aptamer film for sensing. The label-free detection combined with the readily adaptive assembly process could be invaluable for diverse analytical fields.
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