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In page Mayonnaise:

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The nutrient content of mayonnaise (> 50% edible oil, 9–11% salt, 7–10% sugar in the aqueous phase) makes it suitable as a food source for many spoilage organisms. A set of conditions such as pH between 3.6 and 4.0, and low water activity aw of 0.925, restricts the growth of yeasts, a few bacteria and molds.[4] Yeasts of the genus Saccharomyces, Lactobacillus fructivorans, and Zygosaccharomyces bailii are the species responsible for the spoilage of mayonnaise. The characteristics of spoilage caused by Z. bailli are product separation and a "yeasty" odor. A study suggests that adding encapsulated cells of Bifidobacterium bifidum and B. infantis prolongs the life of mayonnaise up to 12 weeks without microorganism spoilage.[citation needed]