Growth of L. casei 7469 in a low-sodium, fatty acid-free medium is inhibited synergistically by potassium and acetate. Neither potassium nor acetate is significantly inhibitory when tested separately. The inhibition is readily reversed by either lithium or sodium and by a wide variety of fatty acids, the most effective of which are lactobacillic, oleic, linoleic, and linolenic acids.
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Camien et al. (1957) studied this question.