Sensitive characterization of polyphenolic antioxidants in Polygonatum odoratum by selective solid phase extraction and high performance liquid chromatography-diode array detector-quadrupole time-of-flight tandem mass spectrometry.

•Antioxidants were screened by DPPH spiking combined with HPLC–DAD.•Fe3O4@PDA was prepared to selectively extract polyphenolic antioxidants.•Twenty-five antioxidants were efficiently characterized by HPLC–QTOF-MS/MS.•Four antioxidants were first reported.