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. Author manuscript; available in PMC: 2015 May 1.
Published in final edited form as: Electrophoresis. 2013 Dec 5;35(9):1214–1225. doi: 10.1002/elps.201300451

Figure 1.

Figure 1

(A) Different shapes of stainless steel electrospray emitters investigated for optimal ESI performance: symmetrically tapered electrospray needle (1), blunt tapered tip (2), sharp tapered needle (3), 30° bevel tip made from 2 (4), 45° bevel tip made from 2 (5), 35° bevel tip with a smaller surface area (6). (B) Average signal-to-noise ratio of arginine as a function of flow rate and electrospray potential. Emitter geometry for each plot is indicated in the top right corner. Sample: 20 µM each of proline, threonine, isoleucine, and arginine in 0.2% formic acid and 50% methanol. Reprinted with permission from Ref [29]. Copyright American Chemical Society 2010.