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Absolute intensity (top) and signal-to-noise ratio (bottom) for the leucine enkephalin [M+H]+ ion vs. DC charging potential for a 1 μM leucine enkephalin solution in 99.9:0.1 (v:v) water:acetic acid. An AMUSE chip with 3-μm nozzles was used. Operating conditions: 40 μL min-1 liquid flow rate, 7.2 L min-1 N2, QiT detection.
