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Rapid Separation of Fat for Pesticide Residue Analysis of Milk Products

Dairy Laboratory, Division of Chemistry, State Department of Agriculture, Sacramento, California

ABSTRACT

Most procedures for the examination of a milk product for fat-soluble pesticide residues require a preliminary separation of fat. This usually is done by an ether extraction, as in the Mills procedure (3). This extraction and the subsequent evaporation of the solvents is time-consuming and may lead to some loss of pesticide residue.

The fat obtained by the Babcock test may be used for the analysis, but the action of the acid may cause a loss of pesticide residue and Endrin is destroyed by this method (1).

Treatment of the milk with alkali to saponify the fat destroys some pesticide and alters others; 1,1,1-trichloro-2,2-bis (p-chlorophenyl) ethane (DDT) and 1,1-dichloro-2,2-bis-(p-chlorophenyl) ethane (DDD) are converted to dichlorodiphenyl dichloroethylene (DDE) (4).

A number of methods that use surfactants have been proposed as modified Babcock tests. Most of these are alkaline in reaction. A neutral reagent (2) used for the Gerber test did not give satisfactory fat separation with most milk products.