Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 405, Issue 6, Pages 1977-1983Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-012-6637-8
Keywords
DNA extraction; Microtip; Electric field; Human genomic DNA; Human samples
Funding
- NSF STTR II award [0956876]
- NSF [ECCS-0846454]
- NIH SBIR [NIH/NIGMS 1R43GM099347]
- Directorate For Engineering [0956876] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [0846454] Funding Source: National Science Foundation
- Div Of Industrial Innovation & Partnersh [0956876] Funding Source: National Science Foundation
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Simple and rapid extraction of human genomic DNA remains a bottleneck for genome analysis and disease diagnosis. Current methods using microfilters require cumbersome, multiple handling steps in part because salt conditions must be controlled for attraction and elution of DNA in porous silica. We report a novel extraction method of human genomic DNA from buccal swab and saliva samples. DNA is attracted onto a gold-coated microchip by an electric field and capillary action while the captured DNA is eluted by thermal heating at 70 A degrees C. A prototype device was designed to handle four microchips, and a compatible protocol was developed. The extracted DNA using microchips was characterized by qPCR for different sample volumes, using different lengths of PCR amplicon, and nuclear and mitochondrial genes. In comparison with a commercial kit, an equivalent yield of DNA extraction was achieved with fewer steps. Room-temperature preservation for 1 month was demonstrated for captured DNA, facilitating straightforward collection, delivery, and handling of genomic DNA in an environment-friendly protocol.
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