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Moisture content and water activity are related measurements, but they answer different questions.
Moisture measures the amount of water present in a sample.
It may help assess:
Water activity provides information about how available water is for microbial growth and other reactions.
Water can interact differently with ingredients depending on the formulation.
Two products can therefore have similar moisture levels while having different water activities.
Use the decision question:
PBR's documented service catalogue includes both moisture and water activity testing for applicable matrices.
Speak with PBR about the product matrix and the quality question you are trying to answer.