On-Chip Spyhole Mass Spectrometry for Droplet-Based Microfluidics

For efficient coupling of droplet-based microfluidics with mass spectrometry (MS), a spyhole drilled on the top of a microchip is used to sample the passing droplets by electrostatic-spray ionization (ESTASI) MS. The technique involves placing an electrode below the chip under the spyhole and applying high-voltage pulses. Electrospray occurs directly from the spyhole, and the droplet content is analyzed by MS without a dilution or oil removal step. To demonstrate the versatility of this technique, we have successfully monitored a droplet-based tryptic digestion, as well as a biphasic reaction between β-lactoglobulin in water and α-tocopheryl acetate in 1,2-dichloroethane, where the protein extracts the antioxidant from the oil phase and becomes reduced.


Published in:
Angewandte Chemie International Edition, 53, 4408–4412
Year:
2014
Publisher:
Weinheim, Wiley-V C H Verlag Gmbh
Keywords:
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 Record created 2014-03-06, last modified 2018-03-17

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