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. Author manuscript; available in PMC: 2012 Jul 15.
Published in final edited form as: Anal Chem. 2011 Jun 22;83(14):5797–5803. doi: 10.1021/ac200960h

Figure 4.

Figure 4

Characterization of the PDMS membrane based microfluidic ESI emitter stability and reproducibility. (A) RSD of TIC and signal intensity of infused 1 μM leucine enkephalin in 10% methanol ESI solvent during continuous 6 days operation. (B) TIC of infused 1 μM angiotensin I in a 2.5h run. (C) Emitter-to-emitter reproducibility in the same batch with infusion of 1 μM leucine enkephalin. (D) Batch-to-batch reproducibility with infusion of 1 μM angiotensin I. In all experiments, the infusion flow rate was 100 nL/min, and the applied ESI potential was 2.5 kV.