A. Chlorinated Pesticides in Soybeans, Soybean Oil, and Its by-Products During Processing. B. Effect of Thermal Oxidation on Mixtures of Palm and Soybean Oil
A. Soybean samples were collected from seven different locales in Central Illinois and subjected to analysis for chlorinated pesticides. Different parts of the beans showed varying levels of residue concentrations. It was found that pesticide residues had a tendency to accumulate, in descending order, in hypocotyls, hulls, and cotyledons, on the basis of ground samples. When the oils extracted from the same fractions were analyzed, much higher concentrations of residues were located in hulls than hypocotyls, which had greater concentrations than cotyledons. Crude, refined, bleached, and deodorized oils, soapstock, Fuller's earth sludge, and deodorization condensate were analyzed for BHC isomers, heptachlor, heptachlor epoxide, aldrin, dieldrin, endrin, DDT, DDD, and DDE. None of the processing steps except deodorization were completely effective in the removal of chlorinated pesticide residues. Oil deodorized at 250(DEGREES)C under 1-5 mm pressure, was almost free of such residues, whereas all the residues were concentrated in the deodorization condensate. It is recommended that the hulls, and the oil processing by-products used in the animal feeds should be thoroughly monitored for pesticides, and the waste materials should be disposed of properly, so as not to contaminate the environment.
Agriculture, Food Science and Technology
University of Illinois - Urbana-Champaign
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University of Illinois at Urbana-Champaign