ABSTRACT
Alkaloids and flavonoids in flowers, flower buds, stems, leaves, and bulbs of Fritillaria thunbergii were identified by LC-LTQ-Orbitrap MSn.Alkaloids were identified by ACQUITY UPLC BEH C₁₈（2.1 mm×50 mm, 1.7 μm ) chromatographic column with a mobile phase of 10 mmol•L⁻¹ ammonium formate-acetonitrile and gradient elution in positive MS scan mode.Meanwhile, flavonoids were analyzed by Agilent-Zorbax SB C₁₈ (4.6 mm×250 mm, 5 μm) chromatographic column with a mobile phase of 0.2% acetic acid-acetonitrile and gradient elution in negative MS scan mode.Combined with literature reports, chemical constituents were identified and determined by accurate molecular weights and fragment ion peaks in the ESI-MS/MS spectra based on high resolution mass spectrometer.In all parts of F.thunbergii, 37 alkaloids including 7 alkaloids (zhebeininoside, peimisine, peimine, peiminine, ebeiedinone/puqiedinone, ebeiedine/ puqiedine, peimisine-N-oxide) were simultaneously analyzed.Moreover, 16 flavonoids including quercetin, kaempferol and their glycosides were identified.The results indicated that the aerial parts had the similar alkaloids as the bulbs on the whole.Meanwhile, it had a series of flavonoids undetected in the bulbs.Our results provided the scientific basis for the development and utilization of aerial parts of F.thunbergii.