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. Author manuscript; available in PMC: 2016 Jun 1.
Published in final edited form as: Talanta. 2015 Feb 10;138:117–122. doi: 10.1016/j.talanta.2015.01.040

Fig 1.

Fig 1

Schematic diagram of the SCX-SPE CZE-ESI-MS/MS system. Provisions are made to use N2 gas pressure to pump analyte and reagents through the monolith. The separation is driven by the difference between the separation voltage and the spray voltage. The sheath liquid is electrokinetically driven by the electrospray voltage.