AchyranthosideI and Achyranthoside Ⅱ which were considered to be effective constituents from Achyranthes bientata BI were identified by electrospray tandem ionization mass spectrometric (ESI-MS^n) methods after macro-porous adsorbent chromatographic separation. Their characteristic mass spectra can be use as fingerprint for the identification of AchyranthosideI and Achyranthoside Ⅱ . This method is simple .,rapid and highly sensitive.
