Lab-on-a-chip microdevice with contactless conductivity detector

Abstract

This paper describes a new contactless conductivity detector, whose electrodes are constructed of microchannels filled with solution of KCl called pseudoelectrodes. The lab-on-a-chip microdevice was fabricated in poly(dimethylsiloxane) PDMS, using a moulding technique. The mould was made from a dry negative photoresist with a thickness of 50 m.!During! the! tests,! the! dimension! and! arrangement! of! pseudoelectrodes microchannels were evaluated. The analyte was pumped into the microchannel using a syringe pump with a flow rate of 50 L/min.!Reproducible!changes of the signal were obtained. © 2013 Polish Academy of Sciences. All rights reserved.