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AssigneeState of Oregon acting by and through the Oregon State Board of Higher Education on behalf of Oregon State University
InventorsJames W. Ayres, William E. Sandine, George H. Weber
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A metabolite material of propionibacteria, having a metabolite of molecular weight greater than 300, is added to a food product to inhibit the growth of gram negative psychotropic bacteria, yeast, mold, gram positive bacteria, or Listeria. The metabolite material may contain less than 0.02% propionic acid such that there is insufficient propionic acid per se to inhibit microbial growth. The metabolite material is produced by growing propionibacteria cells in a liquid growth medium to produce a mixture containing the metabolite material. The mixture can be concentrated and added to a food product as a concentrated liquid or powder. The metabolite material added to a food product may contain viable cells of propionibacteria.
A process for preserving a food product against a gram negative psychotropic bacteria comprising combining with a food product that is subject to spoilage by growth of a gram negative psychotropic bacteria, a metabolite-containing material that is produced by a culture of Propionibacterium and that contains a metabolite, other than propionic acid, the material being present in an amount sufficient that the metabolite inhibits the growth of gram negative psychotropic bacteria and that the material provides less than 0.02% propionic acid in the food product such that there is insufficient propionic acid per se to inhibit the growth of gram negative psychotropic bacteria.
Dependencies are inferred from the claim text.