Hydrodynamic control for non-biased injection and simultaneous complementary analysis

One of the fundamental advantages of translating analytical separations to the microchip format is the ability to run multiple analyses in parallel. High throughput can be achieved by simultaneously analysing different samples, and more information can be obtained faster when samples are simultaneously analysed by complementary methods. This work introduces a new microfluidic approach for delivering individualised separation chemistries to separate microchannels for simultaneous analysis. In addition to electrokinetic injection, a new method was developed for hydrodynamic injection of a single sample into two separation channels using dyes and applied to the analysis of inorganic cations.