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- W2093044244 abstract "Deprotonation reactions of multiply charged protein ions have been studied by introducing volatile reference bases at atmospheric pressure between an electrosonic spray ionization (ESSI) source and the inlet of a mass spectrometer. Apparent gas-phase basicities (GB(app)) of different charge states of protein ions were determined by a bracketing approach. The results obtained depend on the conformation of the protein ions in the gas phase, which is linked to the type of buffer used (denaturing or nondenaturing). In nondenaturing buffer, the GB(app) values are consistent with values predicted by the group of Kebarle using an electrostatic model (J. Mass Spectrom.2002, 38, 618) based on the crystal structures, but taking into account salt bridges between ionized basic and acidic sites on the protein surface. A new basicity order for the most basic sites was therefore obtained. An excellent agreement with the charge residue model (CRM) is obtained when comparing the observed and calculated maximum charge state. Decharging of the proteins in the electrosonic spray process could be also useful in the study on noncovalent complexes, by decreasing repulsive electrostatic interactions. A unified mechanism of the ESSI process is proposed." @default.
- W2093044244 created "2016-06-24" @default.
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- W2093044244 date "2008-04-01" @default.
- W2093044244 modified "2023-10-10" @default.
- W2093044244 title "Investigation of deprotonation reactions on globular and denatured proteins at atmospheric pressure by ESSI-MS" @default.
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- W2093044244 doi "https://doi.org/10.1016/j.jasms.2007.12.011" @default.
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