Diagnostic fragment-ion-based and extension strategy coupled to DFIs intensity analysis for identification of chlorogenic acids isomers in Flos Lonicerae Japonicae by HPLC-ESI-MSn

► A method of modified DFIBES coupled to DFIs intensity analysis was established. ► 41 CGA isomers in FLJ including 8 categories of CGA were detected and identified. ► It could be used to simultaneously screen and identify the constituents in TCMs.