A novel method for rapidly detecting ginsenosides was developed based on nano electrospray extractive ionization(NanoEESI) tandem mass spectrometry.Without any chromatographic separation,the raw extract of ginseng roots were directly introduced to the gasless NanoEESI source for production of sodiated ions of ginsenosides.The signals of sinsenosides ~ were identified by tandem mass spectrometry.The characteristic fragmentation patterns were therefore used as molecular markers to differentiate ginseng roots ...