EFFECT OF VARIOUS PHYSICAL TREATMENTS ON CERTAIN ORGANOCHLORINE HYDROCARBON INSECTICIDES FOUND IN MILK FAT

Series of experiments were carried out to determine whether heat, deodorization, steam deodorization, and freeze-drying contributed to a reduction or caused the elimination of heptachlor epoxide and dieldrin from butteroil. Freeze-drying and mild deodorization treatments were not effective. More severe deodorization reduced the insecticide levels significantly; as did heating at very high temperatures. Steam deodorization at 180–195 C and 0.01–0.5 mm Hg for five hours completely removed these organochlorine insecticide residues. © 1968, American Dairy Science Association. All rights reserved.