TANACETUM (CHRYSANTHEMUM) CORYMBOSUM SEED OIL - A RICH SOURCE OF A NOVEL CONJUGATED ACETYLENIC ACID

A new conjugated trans, trans-diunsaturated acetylenic acid (17%), fou nd for the first time in nature as a main component of the seed oil of Tanacetum (Chrysanthemum) corymbosum, was shown to be octadeca-8t, 10 t-dien-12-ynoic acid. Another already known naturally occurring acetyl enic acid, crepenynic acid (10%), was found also in the seed oil. The structure of this new unusual fatty acid was confirmed by chromatograp hic (thin-layer chromatography, gas chromatography, high-performance l iquid chromatography) and spectroscopic (infrared, ultraviolet, mass s pectrometry) methods by using different chemical derivatizations (deut eration, preparation of picolinyl ester, dimethyloxazoline, and maleic anhydride adduct).