Electrophoretic Desalting to Improve Performance in Electrospray Ionization Mass Spectrometry.

Mass spectrometers are sensitive tools used to identify and quantify both small and large analytes using the mass-to-charge ratios (m/z) of ions generated by electrospray ionization (ESI) or other methods. Ionization typically generates protonated or deprotonated forms of the analytes or adducts with adventitious metal ions derived from the spray solvent. The formation of a variety of ionized forms of the analyte as well as the presence of cluster ions complicates the data and can have deleterious effects on the performance of the mass spectrometer, especially under high salt or buffer conditions. To address this, a method involving a dual-electrode nano-electrospray source has been implemented to rapidly and temporarily desalt the spray solution of interfering cationic and anionic species using electrophoretic transport from the spray tip. Peptides, proteins, and pharmaceutical drugs all showed improved results after the desalting process as measured by the quality of the mass spectra and the limits of detection achieved. Importantly ordinary phosphate buffers could be used to record protein mass spectra by nano-ESI.