Abstract
Abstract Nonpolar pesticides added to milk are adsorbed onto the cream phase and do not penetrate appreciably into the fat globule of the milk. This adsorption results in low recoveries of nonpolar pesticides in extractions with hexane-ether (1:1) carried out immediately after spiking and 5 hours later. Recoveries from raw and pasteurized homogenized milk by an extraction procedure that gives low fat recovery parallel polarities of the pesticides as judged by their extraction p-values. Recoveries by an extraction procedure that gives high fat recovery were satisfactory. With the most polar of the pesticides, recoveries by the extraction procedure giving low fat recovery consistently exceeded those by the procedure giving high fat recovery. Although the data indicate that added pesticides are adsorbed on the fat globule, the nonpolar pesticides may also be bound in the aqueous phase of the milk after removal of the cream.
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