PROCESS FOR THE ISOLATION FROM NEEM OIL OF ACTIVE PRINCIPLES EVINCING OVIPOSITION DETERRENT ACTIVITY IN INSECTS

摘要

Process for the isolation from neem oil of active principles evincing oviposition deterrent activity in insects which comprises extracting neem seed oil with an organic solvent of the kind described herein, concentrating the extract,  subjecting the concentrated extract to column chromatography over silica gel in order to fractionate it into a number of portions, re-chromatographing the first of said portions into at least twenty fractions, collecting the middle fractions, separating by filtration the solid content of said collected fractions, acetylating said filtered solid, removing the acetylated product in any known manner and recovering the non-acetylated residue as the desired active principle.