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Water activity (aw) is a critical parameter in food chemistry and nutrition, representing the availability of water for microbial growth, chemical reactions, and enzymatic activities in food. Unlike moisture content, which measures total water in a food, water activity specifically indicates the fraction of water that is free and unbound, capable of supporting biological and chemical processes. Understanding and controlling water activity is essential for ensuring food safety, quality, stability, and shelf life. Foods with high water activity, generally above 0.85, are more prone to microbial spoilage, including bacterial, yeast, and mold growth. Conversely, foods with low water activity are less susceptible to microbial contamination but may undergo physical and chemical ______ __________ __________ ______ ___ _____ _____ _________ ________.
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