Jan 01, 2019 · An API mass spectrometer (HITACHY, Japan) composed of degasser (Aijiren ), solvent delivery systems pump (Aijiren ), autosampler (Aijiren ), Thermostat column compartment (Waters, USA) (Aijiren ), and API 4000 mass spectrometer, ACE 5, C18 (50 × 2.1 mm), 5 μm; computer system, Windows XP, SP3, data management software 1.5.1