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. 2021 Apr 5;11(6):791–798. doi: 10.1016/j.jpha.2021.03.014

Table 1.

MS parameters applied in direct LC/MS and LC/Q-TOF-MS/MS experiments for the determination of accurate masses of product ions and getting ion fragmentation patterns.

Parameter Value or setting
Ion source type Dual ESI
Ion polarity Positive
The range of m/z 100–1000
MS operating mode Scan
Rate 1.5 spectra/s
Nebulizing gas (N2) pressure 35 psi
Nebulizing gas flow 1.5 L/min
Drying gas (N2) flow 10 L/min
Drying gas temperature 350 °C
Fragmentor 175 V
Skimmer 45 V
OCT 1 RF Vpp 750 V
Capillary voltage 3500 V
MS/MS method Targeted
 

  • Slope

  • 4 m/z
 

  • Offset

  • 5 V
 

  • Collision energy

  • 30 eV

MS: mass spectrometry; LC/MS: liquid chromatography/tandem mass spectrometry; Q-TOF: quadrupole-time of flight; ESI: electrospray ionization; OCT: octopole; RF: radio frequency; Vpp: peak-to-peak value.