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Intrinsic and Extrinsic Factors Affecting Microbial Growth in Food Systems

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Food Safety Engineering

Part of the book series: Food Engineering Series ((FSES))

Abstract

The food environment can support or reduce the ability of microorganisms to persist, establish and grow. Each one presents as a natural characteristic of a food ingredient or adjusted through manufactured processes. Intrinsic and extrinsic factors play very important roles to maintain a microbiologically safe food system. Intrinsic factors include those that are internal to the food product itself, such as nutrient content, pH levels, water activity, redox potential, and other antimicrobial components acting as defense mechanisms against microbes. Extrinsic factors are imposed from the environment in which the food product is present, such as temperature, relative humidity, gaseous environments, or presence of competitor microorganisms. Minor fluctuations in these factors, either individual or multiple, can alter the stability of a food product and make them susceptible to the growth of spoilage or pathogenic microorganisms. As not all microorganisms are equal, a combination of various factors are utilized to influence the separate behaviors of bacteria, yeasts, and molds. A thorough understanding of how the intrinsic and extrinsic factors are used in a multicomponent approach is essential for ensuring food safety and quality. The characteristics and effects of these factors on microbial survival and growth will be discussed within this chapter.

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Correspondence to Hossein Daryaei .

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Rolfe, C., Daryaei, H. (2020). Intrinsic and Extrinsic Factors Affecting Microbial Growth in Food Systems. In: Demirci, A., Feng, H., Krishnamurthy, K. (eds) Food Safety Engineering. Food Engineering Series. Springer, Cham. https://doi.org/10.1007/978-3-030-42660-6_1

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