Journal Highlight: On-chip spyhole mass spectrometry for droplet-based microfluidics

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  • Published: May 12, 2014
  • Author: spectroscopyNOW
  • Channels: Base Peak
thumbnail image: Journal Highlight: On-chip spyhole mass spectrometry for droplet-based microfluidics
For efficient coupling of droplet-based microfluidics with mass spectrometry, a spyhole drilled on the top of a microchip is used to sample the passing droplets by electrostatic spray ionization.

On-chip spyhole mass spectrometry for droplet-based microfluidics

Angewandte Chemie International Edition, 2014, 53, 4408-4412
Natalia Gasilova, Qiuliyang Yu, Liang Qiao and Hubert H. Girault

Abstract: 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.

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