Method details
Liquid chromatography mass spectrometry analysis
The analysis was performed using a Waters Acquity G2 Q-TOF LC–MS instrument. This system is composed of a Waters Acquity UPLC system coupled to a quadrupole time-of flight mass spectrometer. The samples were eluted using a Titan C18 HPLC analytical column (100 mm × 2.1 mm, 1.9 μm) and preceded by a Titan C18 guard cartridge (5 mm × 2.1 mm, 1.9 μm) with the column set to 35 °C. All samples were kept refrigerated to 4 °C in the UPLC autosampler and a 10 μL injection volume was used with a total flow rate of 0.3 mL/min over a total run time of 12 min. All solvents used were LC–MS grade and ultra-pure 18.2 MΩ water was used for each step. Mobile phase A consisted of water + 0.1% formic acid while mobile phase B was acetonitrile + 0.1% formic acid. The following tables contain the gradient details for list of compounds analysed (Table 1 and Table 2):