Novel lipid constituents identified in seeds of Nigella sativa (Linn)

novel lipids were isolated from the unsaponifiable matter extracted from seeds of nigella sativa linn by using n-hexane. the new dienoate and two monoesters were the new lipids identified by spectral (ir, 1h- and 13c-nmr spectra, mass spectrum, elemental analysis) and chemical analysis. the dienoate (1) was identified as methylnonadeca-15,17-dienoate and two monoesters were identified as pentyl hexadec-12-enoate (2) and pentyl pentadec-11-enoate (3). linoleic acid, oleic acid, b-sitosterol and stigmasterol were identified as part of the lipid structures. all compounds exhibited moderate activity against staphylococcus aureus and poor activity against shigella spp, and klebsiella pneumoniae.