| http://www.w3.org/ns/prov#value | - The determination of the gas-phase acidity of a peptide (AH) starts with the formation of a series of proton-bound cluster anions, [A???H???Ai]?? (or [A?????H+???Ai??]??), in the ion source region of the mass spectrometer, where A?? and Ai?? are the deprotonated forms of the peptide and the reference acids, respectively.
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