Asynchronous Magnetic Bead Rotation (AMBR) Microviscometer for Label-Free DNA Analysis

We have developed a label-free viscosity-based DNA detection system, using paramagnetic beads as an asynchronous magnetic bead rotation (AMBR) microviscometer. We have demonstrated experimentally that the bead rotation period is linearly proportional to the viscosity of a DNA solution surrounding th...

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Bibliographic Details
Published in:Biosensors (Basel) 2014-03, Vol.4 (1), p.76-89
Main Authors: Li, Yunzi, Burke, David T, Kopelman, Raoul, Burns, Mark A
Format: Article
Language:English
Subjects:
DNA
genetic analysis
label-free
magnetic
microdevice
paramagnetic
quantitative PCR
restriction digestion
viscometer
viscosity
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Summary:We have developed a label-free viscosity-based DNA detection system, using paramagnetic beads as an asynchronous magnetic bead rotation (AMBR) microviscometer. We have demonstrated experimentally that the bead rotation period is linearly proportional to the viscosity of a DNA solution surrounding the paramagnetic bead, as expected theoretically. Simple optical measurement of asynchronous microbead motion determines solution viscosity precisely in microscale volumes, thus allowing an estimate of DNA concentration or average fragment length. The response of the AMBR microviscometer yields reproducible measurement of DNA solutions, enzymatic digestion reactions, and PCR systems at template concentrations across a 5000-fold range. The results demonstrate the feasibility of viscosity-based DNA detection using AMBR in microscale aqueous volumes.
ISSN:2079-6374
2079-6374
DOI:10.3390/bios4010076