Microfluidic Concentrator

submitted by: hsiaoping
This movie shows a microfluidic concentrator to concentrate proteins in a micro-chamber by using a conducting ion exchange granule comprising of nano-pores or nano-channels permeable to ions. We put fluorescein-tagged bovine serum albumin(BSA) in phosphate buffer in three different pH buffers. At the lowest pH (pH 5.5), we can only see the dark flow of non-fluorescent counter-ions to eject. At pH 6.6 and pH 11, in constrast, we can see a bright flow of fluorescent co-ions ejected from the...