ENH 333 Lecture Notes - Lecture 3: Sodium Chloride, Reduction Potential, Modeling Language
28 Mar 2017
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Lecture 3 factors affecting microbial growth in food. Microorganisms are influenced by numerous physical and chemical factors all present in food. All microbial species have a window of physical and chemical ranges in which they can grow usually dependent on the natural environment of the organism. There are various internal and external properties of food that influence microbial growth. Growth is not related to survival in this instance cells may survive extreme conditions while not growing and start growing again once conditions are favourable. These are the factors that are inherent parts of any given foodstuff. ph. Most bacteria have an optimal ph for growth around neutrality (6. 6 7. 5) and a maximum of 8-9 and minimum of 4-4. 5. Moulds can grow between 0 and 11, with an optimum of 3-3. 5. Yeasts can grow between 1. 5 and 8. 5, with an optimum of 4-4. 5.
