Process for obtaining a pepper extract with insecticidal activity

摘要

PCT No. PCT/EP85/00333 Sec. 371 Date Jul. 24, 1986 Sec. 102(e) Date Jul. 24, 1986 PCT Filed Jul. 6, 1985 PCT Pub. No. WO86/01981 PCT Pub. Date Apr. 10, 1986.An insecticidally active fraction is obtained from black pepper by a process comprising the following steps: (a) extraction of black pepper in ground form with CO2 at 30 to 70 DEG C. and 150 to 500 bar; (b) removal of sharp tasting fractions therein in a first expansion step at 25 to 35 DEG C. and 70 to 150 bar; (c) removal of an oily fraction containing the insecticidally active components as well as most of the essential oils in a second expansion step at 15 to 30 DEG C. and 40 to 70 bar; (d) removal of essential oils by steam distillation, and if desired; (e) hydrogenation of the insecticidally active components.