Patent ID: 8388822

Claim:
A method for transporting and detecting polynucleotides in a microfluidic device, said method comprising: a) providing a sample comprising polynucleotide molecules of different sizes, wherein said polynucleotide molecules comprise DNA and/or RNA; b) providing a microfluidic device comprising an inlet, a first microfluidic channel in fluidic communication with a second microfluidic channel, wherein said first and second microfluidic channels join at a junction, and wherein said first microfluidic channel is in fluidic communication with said inlet; c) transporting said sample into said inlet port and through said first microfluidic channel to said junction with a hydrostatic pressure differential; d) at said junction electrophoretically diverting said polynucleotides from said first microfluidic channel into said second microfluidic channel; e) transporting said polynucleotide through said second microfluidic channel; and f) detecting said polynucleotide by detecting an optically detectable reporter associated with said polynucleotide.