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Lactic Culture Inocula Required to Inhibit Staphylococci in Sterile Milk¹

Department of Nutrition and Food Sciences, Utah State University, Logan 84322

ABSTRACT

The addition of between .1 and .01% of an active lactic culture blend, composed of Streptococcus strains AM₂ and ML₈ (2:1 v/v), to milk was sufficient to inhibit growth and toxin production during 24 h at 32 C by four Staphylococcus aureusstrains capable of producing enterotoxins A, B, C, and D. Inhibitory properties were independent of H₂O₂ and nisin. An unidentifiable dialyzable component(s) was developed in addition to acidic metabolites. Staphylococcal growth and toxin development were also checked when pH was controlled at 6.0.

¹ This investigation was supported by Public Health Service grant UI-00748 from the National Center for Urban and Industrial Health, Consumer Protection by the Director of Utah Agricultural Experiment Station, paper 1307.

² Present address: Department of Medicine, University of Illinois, Chicago 60680.