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. Author manuscript; available in PMC: 2006 Jan 31.
Published in final edited form as: Anal Chem. 2005 May 15;77(10):3173–3182. doi: 10.1021/ac0482312

Figure 1.

Figure 1

Ion/ion reaction data for ubiquitin [U + 7H]7+ with doubly charged anions derived from BDSA. (a) Spectrum acquired with 300-ms anion accumulation time and 500-ms ion/ion reaction time in positive mode. (b) Spectrum acquired after 700-ms anion accumulation time and 1000-ms ion/ion reaction time in negative mode. (c) Spectrum acquired after ion/ion reaction between singly charged complex anions and [U + 7H]7+ ions, which were reintroduced into the trap. The small peaks on either side of the main ion/ion reaction products were also present in the initial isolated ion population.