method Samples were analyzed with ultrahigh performance liquid chromatography (UHPLC) coupled to a quadrupole time of flight (QToF)mass spectrometer (Acquity QToF Premier system; Waters, Man- chester, UK) using electrospray ionization (ESI).
method Samples were analyzed with ultrahigh performance liquid chromatography (UHPLC) coupled to a quadrupole time of flight (QToF)mass spectrometer (Acquity QToF Premier system; Waters, Man- chester, UK) using electrospray ionization (ESI).