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(A) Measurement of MS signal intensity and relative standard deviation (RSD) of total ion current (TIC) of 1 μM leucine enkephalin solution at different ESI voltages using the PDMS membrane based ESI emitter. The infusion rate was 200 nL/min. (B) Increased ranges of voltage and flow rate providing a stable electrospray using the membrane based microfluidic ESI emitter. (C) Total ion current of 1 μM leucine enkephalin solution at 10 nL/min. The applied ESI voltage was 2.1 kV.
