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. 2014 Dec 18;87(2):1281–1287. doi: 10.1021/ac503981c

Figure 2.

Figure 2

NanoESI mass spectra of (a) DAB-16 in a 1.0 mM aqueous ammonium acetate solution adjusted to pH = 6.4 with acetic acid and (b) this solution adjusted to pH = 2.6 by mixing with a 1.0 M aqueous acetic acid solution at a 1:1 ratio. qave denotes the average charge state.