Abstract
For highly complex mixtures, coelution is a common phenomenon in chromatography. A great deal of resolution is hidden in coelution, and lost due to inevitable molecular diffusion during sample transfer. The molecular diffusion may lead to band broadening and remix of separated peaks, which cause degradation of achievable resolution. In this study, we introduced droplet microfluidics as a high performance sample transfer tool in two dimensional nanoflow liquid chromatography–capillary electrophoresis separation of a human urine sample. The fine fractionation capability and sampling completeness enabled by the droplet-interface demonstrated the 2D system’s usefulness in high-resolution mapping of real world biological samples.
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