Amides with anti-platelet aggregation activity from Piper taiwanense

Area of Science:

• Natural Products Chemistry
• Pharmacology
• Medicinal Chemistry

Background:

• Piper species are a rich source of bioactive natural products.
• Amides are a class of compounds with diverse biological activities.
• Platelet aggregation plays a crucial role in thrombosis and hemostasis.

Purpose of the Study:

• To isolate and characterize new amide compounds from Piper taiwanense.
• To evaluate the in vitro inhibitory activity of isolated amides on platelet aggregation.

Main Methods:

• Isolation of compounds using chromatographic techniques.
• Structure elucidation of new amides employing spectral analyses (NMR, MS).
• In vitro platelet aggregation assays using collagen as an inducer.

Main Results:

• Three new amides, taiwanamides A-C (1-3), were isolated along with two known amides (4-5).
• All five isolated amides exhibited inhibitory effects on platelet aggregation.
• Taiwanamide C (3) demonstrated the most potent inhibition with an IC50 value of 8.9 microM.
• Taiwanamide B (2) and compound 5 showed IC50 values of 17.3 and 17.4 microM, respectively.

Conclusions:

• Piper taiwanense is a source of novel amide compounds with antiplatelet activity.
• Taiwanamide C is a promising lead compound for further investigation in the development of antiplatelet agents.
• The isolated amides contribute to the understanding of the chemical diversity and pharmacological potential of Piper species.