Q exactive plus orbitrap ms system

Mass spectrometry
analysis was carried out with a high-resolution Q Exactive Plus Orbitrap
MS system connected to a Dionex Ultimate 3000 UHPLC system (Thermo
Fisher Scientific, Waltham, MA). MV and its metabolites were separated
on the UPLC system equipped with a Hypersil GOLD C18 column (100 ×
2.1 mm², 1.9 μm; Thermo Fisher Scientific, Waltham,
MA). The mobile phase was 0.1% formic acid (v/v, solvent A) and methanol
(solvent B) with an injection volume of 5 μL, and the flow rate
was 0.35 mL/min. The gradient process was as follows: 0–1 min,
2% solvent B (held for 1 min); 1–9 min, from 2 to 98% solvent
B; and 9–12 min, 98% solvent B (held for 3 min). The column
oven was set to 35 °C. The electrospray ionization (ESI) parameters
were set as follows: spray voltage, 3 kV; capillary temperature, 320
°C; sheath gas flow rate, 40 L/h; aux gas flow rate, 10 L/h;
and scan range, m/z 133.4 to 2000.
Ionization was conducted in the negative-ion mode. All data obtained
were analyzed by Compound Discovery software (Thermo Fisher Scientific,
Waltham, MA), and the results were compared with those of a previous
data set.^{49 (link)}