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. Author manuscript; available in PMC: 2013 Aug 1.
Published in final edited form as: Anal Bioanal Chem. 2012 Jan 12;403(2):355–365. doi: 10.1007/s00216-011-5679-7

Fig. 1.

Fig. 1

DESI-MS spectra acquired when a solution of 20 μM apamin in methanol/water (1:1 by volume) containing 0.5% formic acid flowed through the thin-layer electrochemical cell with an applied potential of (a) 0.0 V and (b) −1.5 V; CID MS/MS spectra of (c) [apamin+4H]4+ (m/z 507.9) before reduction and (d) [reduced apamine+4H]4+ (m/z 508.8) after reduction; ECD MS/MS spectra of (e) [apamin+4H]4+ (m/z 507.8) before reduction and (f) [reduced apamine+4H]4+ (m/z 508.5) after reduction