Abstract
Phytochemical investigation from the leaves and stem extracts of Piper maingayi Hk.F. resulted in the isolation of a new amide, N-isobutyl-15-(3″,4″-methylenedioxyphenyl)-2 E,4 E,12 Z-pentadecatrienamide (1), together with sesamin (2), piperumbellactam A (3), cepharadione A (4), cepharadione B (5), piperolactam A (6), oleic acid (7), methyl linolenate (8), β-sitosterol (9), butyl dodecanoate (10), and isovanillic acid (11). Their structures were established by the analysis of their spectroscopic (1D and 2D NMR) and spectrometric (MS) data, as well as by comparison with those reported in the literature. Compound (1) exhibited strong inhibition against lipoxygenase (15-LOX) at IC50 42.5 μM and antibacterial activity toward Bacillus subtillis and Pseudomas aeruginosa with minimum inhibitory concentration (MIC) value of 250 μg/mL each.
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