Gel-on-a-chip: continuous, velocity-dependent DNA separation using nanoscale lateral displacement
| Autor: | J. Patel, Robert L. Bruce, Simon Dawes, Stacey M. Gifford, Gustavo Stolovitzky, Yann Astier, Joshua T. Smith, Benjamin H. Wunsch, Sungcheol Kim, Elizabeth A. Duch, Chao Wang |
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| Rok vydání: | 2019 |
| Předmět: |
Models
Molecular Materials science Nanostructure Polymers Diffusion Biomedical Engineering Bioengineering 02 engineering and technology 01 natural sciences Biochemistry Molecular physics Phenomenological model Pressure Nanotechnology Mean flow Base Pairing chemistry.chemical_classification Quantitative Biology::Biomolecules 010401 analytical chemistry General Chemistry Polymer DNA 021001 nanoscience & nanotechnology 0104 chemical sciences Condensed Matter::Soft Condensed Matter chemistry Flow velocity Polymer fractionation 0210 nano-technology Shear flow Gels |
| Zdroj: | Lab on a chip. 19(9) |
| ISSN: | 1473-0189 |
| Popis: | We studied the trajectories of polymers being advected while diffusing in a pressure driven flow along a periodic pillar nanostructure known as nanoscale deterministic lateral displacement (nanoDLD) array. We found that polymers follow different trajectories depending on their length, flow velocity and pillar array geometry, demonstrating that nanoDLD devices can be used as a continuous polymer fractionation tool. As a model system, we used double-stranded DNA (dsDNA) with various contour lengths and demonstrated that dsDNA in the range of 100–10 000 base pairs (bp) can be separated with a size-selective resolution of 200 bp. In contrast to spherical colloids, a polymer elongates by shear flow and the angle of polymer trajectories with respect to the mean flow direction decreases as the mean flow velocity increases. We developed a phenomenological model that explains the qualitative dependence of the polymer trajectories on the gap size and on the flow velocity. Using this model, we found the optimal separation conditions for dsDNA of different sizes and demonstrated the separation and extraction of dsDNA fragments with over 75% recovery and 3-fold concentration. Importantly, this velocity dependence provides a means of fine-tuning the separation efficiency and resolution, independent of the nanoDLD pillar geometry. |
| Databáze: | OpenAIRE |
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