title: Amides with anti-platelet aggregation activity from Piper taiwanense.
abstract: Three new amides, taiwanamides A-C (1-3), and two known amides, 1-cinnamoylpyrrolidine (4) and 1-(m-methoxycinnamoyl)pyrrolide (5), have been isolated from the stem of Piper taiwanense. The structures of the new amides were determined by spectral analyses. These five amides exhibited inhibitory activity of platelet aggregation in vitro. Taiwanamide C (3) owned the most potent inhibition activity of platelet aggregation induced by collagen showing IC(50) value as 8.9 microM. Taiwanamide B (2) and 1-(m-methoxycinnamoyl)pyrrolide (5) exhibited IC(50) values of 17.3 and 17.4 microM, respectively.
authors.affiliation: Graduate Institute of Pharmaceutical Sciences, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, Taiwan, ROC. m635013@kmu.edu.tw
authors.forename: Ih-Sheng
authors.initials: IS
authors.lastname: Chen
authors.forename: Yu-Chang
authors.initials: YC
authors.lastname: Chen
authors.forename: Chang-Hui
authors.initials: CH
authors.lastname: Liao
mesh_terms: D000577:Amides / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology / Q000627:therapeutic use; D006801:Humans; D020128:Inhibitory Concentration 50; D008519:Medicine, Traditional; D008517:Phytotherapy; D031701:Piper; D010936:Plant Extracts / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D010974:Platelet Aggregation / Q000187:drug effects*; D010975:Platelet Aggregation Inhibitors / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D013624:Taiwan
chemical_list: D000577:Amides; D010936:Plant Extracts; D010975:Platelet Aggregation Inhibitors