Automated DNA hybridization transfer with movable super-paramagnetic microbeads in a microflow reactor

An automated DNA hybridization transfer in a microflow reactor is demonstrated by moving paramagnetic beads between two spatially separate solutions with different pH values. The microbeads-based microfluidic platform is fully automated and programmable. It employs a robust chemical procedure for specific DNA hybridization transfer in microfluidic devices under isothermal conditions based on reversible pH alterations. The method takes advantage of high-speed DNA hybridization and denaturation on beads under flow conditions, high fidelity of DNA hybridization, and small sample volumes. The microfluidic platform presented is saleable and applicable to many areas of modern biotechnology such as DNA hybridization chip microarrays, molecular computation, on-chip selection of functional nucleic acids, high-throughput screening of chemical libraries for drug discovery, and DNA amplification and sequencing.