Studies on triterpenoid glycosides from rhizomes of Panacis majoris and their antiplatelet aggregation activity

A new triterpenoid glycoside( 1 ) and seven known triterpenoid glycosides, pseudoginsenoside RT 2 ( 2 ), yesanchinoside R 2 ( 3 ), vinaginsenoside R13( 4 ), vinaginsenoside R8( 5 ), notoginsenoside E( 6 ), 6′′′- O -acetylginsenoside Re( 7 ), 6″- O -acetylginsenoside Rb 1 ( 8 ), were isolated from the rhizomes of Panacis majoris . The new triterpenoid glycoside was elucidated as 3- O -[ β - D -glucopyranosyl-(1→2)- β - D -(6′- O -ethyl)-glucuronopyranosyl]-oleanolic acid-28- O - β - D -glucopyranoside by extensive spectroscopic and phytochemical methods. Compounds 2 ― 8 were obtained from the plant for the first time. Compounds 3 and 4 displayed good activities against adenosine diphosphate (ADP)-induced platelet aggregation, and compounds 1, 5, 6 and 8 showed moderate activities. Compound 6 exhibited moderate antiplatelet aggregation activity induced by arachidonic acid(AA).