Metabolites and intermediates were identified using a quadrupole-time of flight (QqTOF) mass spectrometer, which allowed biotransformation pathways to be deduced.
Protein identity was determined by mass spectrometry using a Quadrupole time-of-flight mass spectrometer with electrospray ionization (ESI-QTOF-MS) (Waters Corp., Milford, MA, USA).
Mass spectra of the protein complexes were acquired using a quadrupole time-of-flight (Q-TOF) mass spectrometer equipped with a Z-spray ion source (Q-TOF Premier, Waters, Milford, MA).
Samples were processed using a quadrupole time-of-flight hybrid mass spectrometer (QSTAR XL mass spectrometer) running with the oMALDI ionisation source.
Real-time measurements of CO conversion are done using a quadrupole mass spectrometer.
The analysis of the breakthrough gas was performed using a quadrupole mass spectrometer.
The reaction product ions are mass analysed using a quadrupole mass spectrometer and detected by a secondary electron multiplier (SEM).
formic acid (50 50 v/ v) by nano-electrospray ionisation MS using a quadrupole-ion mobility spectrometry-orthogonal time-of-flight spectrometer (Synapt HDMS, Waters, Manchester, UK).
(4) Current SIFT-MS instruments use a quadrupole, so the time and mass resolution is quite low compared to PTR-TOF-MS (see below).
The molecular mass of ACP and its derivatives were determined using a Bruker maXis quadrupole time-of-flight (Q-TOF) spectrometer.
The molecular masses of ACP and its derivatives were determined using a Bruker maXis quadrupole-time-of-flight (Q-TOF) mass spectrometer equipped with electrospray ionization (ESI).
