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Mass spectra of β-lac A (pI = 5.1) under electrothermal supercharging conditions (1050 V spray potential) in aqueous solutions containing 100 mM (a,b) ammonium acetate (pH = 6.7), (c,d) ammonium formate (pH = 6.5), and (e,f) ammonium bicarbonate (pH = 8.3) acquired with (a,c,e) ~1465 and (b,d,f) ~305 nm o.d. tips. Percentages are the relative abundances of the unfolded fractions (≥10+ charge states) of β-lac A.
