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Proceedings Paper

Quantifying DNA and proteins using laser-induced thermophoresis
Author(s): Li-Hsien Yu; Chih-Hsuan Wang; Yih-Fan Chen
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Paper Abstract

The study utilized thermophoresis, the directed motion of molecules in a temperature gradient to quantify DNA and proteins for point-of-care applications. Because the direction and speed of thermophoretic motion is dependent on the size, charge, and conformation of the molecules, the binding between molecules can induce changes in their thermophoretic motion. To quantify biomolecules using thermophoresis, we mixed fluorescently-labeled capture probes with samples and then used an infrared laser to create a temperature gradient in the solution. By adding a small fraction of polymers to the buffer solution, we accumulated the fluorescent probes in a temperature gradient using the thermophoretic effects. The thermophoretic motion of the fluorescent probes significantly changed as the target molecules bind to the specially designed capture probes. Consequently, the level of the thermophoretic accumulation, which was determined by the spatial distribution of fluorescent probes, could be used to quantify molecules. This method functioned well even when the buffer contained 10% serum, which suggested that the detection was resistant to the interferences from the molecules in serum. The thermophoresis-based detection method developed in this study only requires a laser and an epi-fluorescence microscope during the detection. Unlike many other commonly seen biosensing methods, quantifying molecules using thermophoresis does not need any fluid channels or pumps for washing away unbound molecules during the detection process. In addition, the detection does not rely on any micro- or nanofabricated chips. In short, this thermophoresis-based biosensing method can be a simple, robust, and sensitive method for quantifying proteins and DNA.

Paper Details

Date Published: 2 March 2015
PDF: 5 pages
Proc. SPIE 9310, Frontiers in Biological Detection: From Nanosensors to Systems VII, 93100F (2 March 2015); doi: 10.1117/12.2078232
Show Author Affiliations
Li-Hsien Yu, National Cheng Kung Univ. (Taiwan)
Chih-Hsuan Wang, National Cheng Kung Univ. (Taiwan)
Yih-Fan Chen, National Yang-Ming Univ. (Taiwan)

Published in SPIE Proceedings Vol. 9310:
Frontiers in Biological Detection: From Nanosensors to Systems VII
Benjamin L. Miller; Philippe M. Fauchet; Brian T. Cunningham, Editor(s)

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