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Tandem mass spectra of tryptic peptides at signal-to-background ratios approaching unity using electrospray ionization high-field asymmetric waveform ion mobility spectrometry/hybrid quadrupole time-of-flight mass spectrometry.
High-field asymmetric waveform ion mobility spectrometry (FAIMS) has been coupled to a quadrupole time-of-flight mass spectrometer for the tandem mass spectrometric analysis of tryptic peptides of pig hemoglobin. Using FAIMS, low levels (fmol/microL) of multiply charged tryptic peptides were separated from relatively intense chemical background such that their tandem mass spectra (MS/MS) lacked many background-related fragment ions observed using a conventional ESI-QqTOFMS instrument. Substantial improvements in both first-order and tandem mass spectra were realized while maintaining approximately the same absolute intensities.
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