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Relationship Between Some Chlorinated Hydrocarbon Insecticides and Lactic Culture Organisms in Milk¹

Department of Food Science, Michigan State University, East Lansing 48823

ABSTRACT

Portions of sterile milk containing 1 ppm of aldrin, DDT, or lindane were inoculated with strains of Streptococcus lactis, Streptococcus cremoris, Streptococcus diacetilactis, and Lactobacillus casei and incubated at 32 C for 14 days. When the insecticides were extracted from the milks and the extracts analyzed by gas-liquid chromatography there was no perceptible evidence of degradation or chemical alteration of the insecticides by the lactic culture organisms.

L. casei cells grown in trpyticase soy broth containing 0.01 and 0.02 ppm of ¹⁴C-dieldrin showed 353 and 830%, respectively, higher radioactive counts than corresponding cells grown in the absence of ¹⁴C-dieldrin, suggesting that a small amount of dieldrin was either adsorbed or incorporated by the cells.

¹ Michigan Agricultural Experiment Station Journal Article no. 4856.

² Present address: Department of Entomology, University of California, Riverside, California 92501.