Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 364, Issue 1-3, Pages 16-18Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2010.04.008
Keywords
Streaming potential; Microfluidics; Bioactive paper
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Funding
- Natural Sciences and Engineering Research Council of Canada
- Canada Foundation for Innovation
- Ontario Innovation Trust
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Streaming potential measurements detected the presence of adsorbed polyvinylamine or potassium polyvinylsulfate in paper-based microfluidic devices. Capillary driven flow in filter paper induced measurable potentials in the range -80 to +80 mV. The magnitude and polarity of the measured potentials were sensitive to the presence of adsorbed polymer. In a second example, paper treated with BSA gave a positive streaming potential at pH 3.7, below the isoelectric point of BSA, and a negative potential at high pH. We propose that streaming potential may provide an electronic interface for paper-based biosensors. (C) 2010 Elsevier B.V. All rights reserved.
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