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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Dynamic Solid Phase DNA Extraction and PCR Amplification in Polyester-Toner Based Microchip

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Author(s):
Duarte, Gabriela R. M. [1, 2, 3, 4] ; Price, Carol W. [3] ; Augustine, Brian H. [5] ; Carrilho, Emanuel [1, 2] ; Landers, James P. [3, 6, 7]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13566590 Sao Carlos, SP - Brazil
[2] Inst Nacl Ciencia & Tecnol Bioanalit, BR-13083970 Campinas, SP - Brazil
[3] Univ Virginia, Dept Chem, Charlottesville, VA 22904 - USA
[4] Univ Estadual Goias, BR-75132903 Anapolis, Go - Brazil
[5] James Madison Univ, Dept Chem & Biochem, Harrisonburg, VA 22807 - USA
[6] Univ Virginia, Dept Mech Engn, Charlottesville, VA 22904 - USA
[7] Univ Virginia, Hlth Sci Ctr, Dept Pathol, Charlottesville, VA 22904 - USA
Total Affiliations: 7
Document type: Journal article
Source: Analytical Chemistry; v. 83, n. 13, p. 5182-5189, JUL 1 2011.
Web of Science Citations: 51
Abstract

A variety of substrates have been used for fabrication of microchips for DNA extraction, PCR amplification, and DNA fragment separation, including the more conventional glass and silicon as well as alternative polymer-based materials. Polyester represents one such polymer, and the laser-printing of toner onto polyester films has been shown to be effective for generating polyester-toner (PeT) microfluidic devices with channel depths on the order of tens of micrometers. Here, we describe a novel and simple process that allows for the production of multilayer, high aspect-ratio PeT microdevices with substantially larger channel depths. This innovative process utilizes a CO(2) laser to create the microchannel in polyester sheets containing a uniform layer of printed toner, and multilayer devices can easily be constructed by sandwiching the channel layer between uncoated cover sheets of polyester containing precut access holes. The process allows the fabrication of deep channels, with similar to 270 mu m, and we demonstrate the effectiveness of multilayer PeT microchips for dynamic solid phase extraction (dSPE) and PCR amplification. With the former, we found that (i) more than 65% of DNA from 0.6 mu L of blood was recovered, (ii) the resultant DNA was concentrated to greater than 3 ng/mu L., (which was better than other chip-based extraction methods), and (iii) the DNA recovered was compatible with downstream microchip-based PCR amplification. Illustrative of the compatibility of PeT microchips with the PCR process, the successful amplification of a 520 bp fragment of lambda-phage DNA in a conventional thermocycler is shown. The ability to handle the diverse chemistries associated with DNA purification and extraction is a testimony to the potential utility of PeT microchips beyond separations and presents a promising new disposable platform for genetic analysis that is low cost and easy to fabricate. (AU)