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Heat Resistant Psychrotrophic Microorganisms

Department of Food Science and Technology, University of California, Davis 95616

ABSTRACT

The title contains two relative terms: heat resistant and psychrotrophic. When microorganisms are exposed to a destructive agent such as heat, they die logarithmically. From an understanding of the logarithmic nature of microbial death, any microbial species can survive any given heat treatment if the volume of product is large enough. One species might be so sensitive to a given heat treatment, such as pasteurization, that a large volume of product is required after treatment to contain one living cell—perhaps 4 million liters or more. For another species, survival of the same heat treatment might be 100%. There is a spectrum of differences in heat resistance in between the imaginary species I have used as examples. It is important to keep the numbers of organisms low in a product that is to be heat treated. The smaller the number of organisms in a raw product, the larger will be the total volume required to contain one living organism after the heat treatment is applied.

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