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Analytical study of a microfludic DNA amplification chip using water cooling effect

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Abstract

A novel continuous-flow polymerase chain reaction (PCR) chip has been analyzed in our work. Two temperature zones are controlled by two external controllers and the other temperature zone at the chip center is controlled by the flow rate of the fluid inside a channel under the glass chip. By employing a water cooling channel at the chip center, the sequence of denaturation, annealing, and extension can be created due to the forced convection effect. The required annealing temperature of PCR less than 313 K can also be demonstrated in this chip. The Poly(methyl methacrylate) (PMMA) cooling channel with the thin aluminum cover is utilized to enhance the temperature uniformity. The size of this chip is 76 mm × 26 mm × 3 mm. This device represents the first demonstration of water cooling thermocycling within continuous-flow PCR microfluidics. The commercial software CFD-ACE+TM is utilized to determine the distances between the heating assemblies within the chip. We investigate the influences of various chip materials, operational parameters of the cooling channel and geometric parameters of the chip on the temperature uniformity on the chip surface. Concerning the temperature uniformity of the working zones and the lowest temperature at the annealing zone, the air gap spacing of 1 mm and the cooling channel thicknesses of 1 mm of the PMMA channel with an aluminum cover are recommended in our design. The hydrophobic surface of the PDMS channel was modified by filling it with 20 % Tween 20 solution and then adding bovine serum albumin (BSA) solution to the PCR mixture. DNA fragments with different lengths (372 bp and 478 bp) are successfully amplified with the device.

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Acknowledgments

The authors would like to thank the National Science Council of the Republic of China for financially supporting this research under Contract No. NSC 100-2221-E-020-024-. Daryl Switak is appreciated for his editorial assistance.

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Authors and Affiliations

  1. Department of Biomechatronics Engineering, National Pingtung University of Science and Technology, 1, Shuefu Road, Neipu, Pingtung, 91201, Taiwan

    Jyh Jian Chen, Chia Ming Shen & Yu Wei Ko

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  1. Jyh Jian Chen
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  2. Chia Ming Shen
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  3. Yu Wei Ko
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Correspondence to Jyh Jian Chen.

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Chen, J.J., Shen, C.M. & Ko, Y.W. Analytical study of a microfludic DNA amplification chip using water cooling effect. Biomed Microdevices 15, 261–278 (2013). https://doi.org/10.1007/s10544-012-9728-6

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  • DOI: https://doi.org/10.1007/s10544-012-9728-6

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