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. Author manuscript; available in PMC: 2010 Aug 1.
Published in final edited form as: Anal Chem. 2009 Aug 1;81(15):6558–6561. doi: 10.1021/ac901172a

Figure 3.

Figure 3

Analysis of a series of plugs that alternately contain leu-enkephalin and met-enkephalin by single stage MS. Plugs were 100 nL with 5 mm gaps of air between them and pumped into the emitter at 200 nL/min. (a) Total ion current for entire sequence of plugs. (b) Extracted ion recording for leu-enkephalin at 556 m/z at concentrations indicated. (c) Extracted ion recording for met-enkephalin at 574 m/z at concentrations indicated. (d) Mass spectrum acquired during elution of a leu-enkphalin sample. Inset shows expanded view shows that signal for met-enekphalin (574 m/z) in this plug is slightly above the noise. (e) Mass spectrum acquired during elution of a met-enkphalin sample. Inset shows expanded view shows that signal for leu-enekphalin (556 m/z) in this plug is not above the noise.