Journal
BIOSENSORS-BASEL
Volume 4, Issue 1, Pages 76-89Publisher
MDPI
DOI: 10.3390/bios4010076
Keywords
label-free; DNA; quantitative PCR; restriction digestion; genetic analysis; viscosity; viscometer; magnetic; paramagnetic; microdevice
Funding
- NIH [EB006789, HG005077]
- Masco Corportation contract UM [N015309]
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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.
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