Three new flavonoid glycosides, Dasuanxinoside F-H (1-3), were isolated from the aerial parts of Allium sativum, together with eight known compounds which were firstly reported in this plant, including three flavonoid glycosides (4-6) and five phenylethanoid glycosides (7-11). Their structures were identified by UV-vis, IR, 1D and 2D NMR spectra, as well as HR-ESI-MS analyses. The inhibitory effect of the isolated compounds on platelet aggregation induced by adenosine diphosphate (ADP) was evaluated in vitro. The results showed that most compounds displayed different degrees of inhibition. Among them, 2, 5, 8 and 9 exhibited the strongest activity on platelet aggregation.

The bulbs of Allium sativum known as garlic are widely used as food or seasoning. In China they have been used as a traditional Chinese medicine (TCM) since ancient times for the treatment of scabies, tuberculosis, pertussis, diarrhea and dysentery. A. sativum has reportedly shown platelet aggregation inhibition, and has been used in the treatment of cardiovascular diseases. However, there are only few studies focusing on the aerial parts, which are normally discarded during harvest. In this study two new ionone glycosides, dasuanxinosides D and E (1, 2), were isolated from the aerial parts together with thirteen known compounds including alkanes derivatives and alkyl glycosides (3-15) which are reported for the first time from this plant. Their structures were identified by extensive NMR and HRMS analyses. The isolated compounds were evaluated for their inhibitory effect on adenosine diphosphate (ADP)-induced platelet aggregation in vitro.