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Aqualab- Lower Water Activity with Humectants


How do manufacturers keep moist pet foods microbially safe during a lengthy shelf-life?

The answer is humectants--ingredients such as glycerine, sugar, and different types of salts. Humectants lower the water activity aw of a product because water preferentially binds to them. Each humectant has its own unique ability to lower aw depending on its chemical makeup. The amount or concentration of the humectants you add determines how much the aw decreases. 

For Further Reading:

  • Which Humectant Should You Use?

  • Basic Steps to Lower Water Activity

  • How to Predict A Change in Water Activity


More detailed information about the above topic can be found on this link.