Intermediate moisture food
shelf-stable food products with moisture contents of 15-40%
Intermediate moisture foods (IMF) are shelf-stable products that have water activities of 0.6-0.85, with a moisture content ranging from 15% - 40% and are edible without rehydration. These food products are below the minimum water activity for most bacteria (0.90), but are susceptible to yeast and mold growth. Historically, ancient civilizations would produce IMF using methods such as sun drying, roasting over fire and adding salt to preserve food for winter months or when preparing for travel. Currently, this form of processing is achieved by using one of four methods: partial drying, osmotic drying using a humectant, dry infusion and by formulation. A variety of products are classified as IMF, such as dried fruits, sugar added commodities, marshmallows, and pie fillings.
Shelf-life and safety
The purpose of IMF foods is to achieve a water activity that the food can be stored safely without refrigeration. However, the food is not sterile. Staphylococcus aureus is a microorganism of concern as it can grow and produce specific enterotoxins in water activities of 0.83-0.86 under aerobic conditions. Because of this, proper handling, storage, hygiene and good manufacturing practices are necessary to prevent Staphylococcus aureus. Molds of Aspergillis and Penicillium species can grow and produce harmful mycotoxins at water activity 0.77-0.85.
The public source identifies “Intermediate moisture food” as shelf-stable food products with moisture contents of 15-40%. This brief keeps that definition visible, then builds a research path around Intermediate, moisture and food.
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