Ever wondered how measuring unbound water can help extend a product’s shelf life?
In this short and engaging video, we demonstrate how water activity is tested using “Walter’s cupcake”, and how this same scientific principle applies far beyond baking. From food and pharmaceuticals to wine and cosmetics, understanding water activity is key to ensuring product safety, stability, and quality.
If you’re a food quality manager looking to strengthen your understanding of water activity, and how it supports product safety, regulatory compliance, and shelf-life optimization, this video provides a clear and practical introduction.
Ever wondered how measuring unbound water can help extend a product’s shelf life? Watch the video!
Why Water Activity Matters
Water activity (aw) measures the amount of unbound water available in a product, not just the total moisture content. This free water directly influences microbial growth, chemical stability, texture, and overall product integrity.
Controlling water activity is therefore one of the most powerful tools for extending shelf life and maintaining quality.
Practical Applications Across Industries
Food Industry
By controlling water activity to 0.85 aw or below, manufacturers can inhibit the growth of bacteria, yeasts, and moulds. This is critical for food safety and regulatory compliance, including requirements under 21 CFR Parts 108, 113, and 114.
Water activity control also prevents common quality issues such as moisture migration. Consider a muesli mix containing raisins, seeds, and bran flakes: over time, moisture migrates from the raisins to the bran flakes. The result? Hardened raisins and soggy flakes. Proper water activity management helps prevent this imbalance and preserves product texture.
View the Application note for Bakery here
View the Application note for Powder & Spices here
View the Application note for Meat here
View the Application note for Chocolate here
View the Application note for Wine here
Pharmaceuticals
In pharmaceutical formulations, water activity plays a crucial role in product stability.
Advanced instruments such as the Novasina LabMaster Neo help:
- Predict stability of proteins and enzymes
- Manage compatibility of hygroscopic excipients such as starch and cellulose
- Reduce risks of API hydrolysis
- Prevent crystallization and powder caking
Uncontrolled moisture can lead to degradation of active pharmaceutical ingredients (APIs), reducing efficacy and potentially impacting patient safety. Monitoring water activity helps mitigate these risks and supports robust formulation development.
View the Pharma Application note here
Cosmetics
In cosmetic and personal care products, optimal water activity contributes to:
- Microbial stability
- Preservation effectiveness
- Maintenance of physical and chemical properties
- Consistent product performance
Controlling unbound water enhances both product stability and consumer safety.
View the Cosmetics Application note here
The Core Challenge
Across industries, the challenge remains the same: excess free water accelerates degradation.
- In food, it promotes microbial growth and spoilage.
- In pharmaceuticals, it destabilizes sensitive components and excipients.
- In cosmetics, it compromises preservation systems and product integrity.
By accurately measuring and controlling water activity, manufacturers gain a proactive tool to extend shelf life, maintain regulatory compliance, and ensure consistent product quality.
Understanding water activity isn’t just about measurement, it’s about control, prediction, and protection.
