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Abstract

Heat-based processes have been used for centuries for food preservation and still remain the most widely used preservation technique in food manufacturing. However, thermal processing treatments are not as efficacious in the destruction of pathogenic microorganisms at low water activities compared to moist environments. Several dry-heat processes have been applied to low-moisture foods and include drying, hot air and baking, air impingement, dry roasting, and oil roasting. These applications require higher temperatures and longer heat times to obtain equivalent lethality to moist-heat processes. Moist-heat processes, which include blanching, moist-air impingement, and controlled condensation steam, are very effective at inactivating microorganisms because the added moisture significantly reduces microbial thermal resistance. However, an increased moisture content of the product can reduce the shelf life, often resulting in the necessity for the (energy consuming) re-drying of product to remove the added moisture. Lastly, extrusion has been shown to be an effective process for microbial inactivation.

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Grasso, E.M., Stam, C.N., Anderson, N.M., Krishnamurthy, K. (2014). Heat and Steam Treatments. In: Gurtler, J., Doyle, M., Kornacki, J. (eds) The Microbiological Safety of Low Water Activity Foods and Spices. Food Microbiology and Food Safety(). Springer, New York, NY. https://doi.org/10.1007/978-1-4939-2062-4_21

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