Maintaining appropriate water activity (aw) is a critical factor in ensuring the shelf stability and safety of gummy supplements. It is a key parameter our manufacturing process controls to prevent microbial growth and spoilage.
Understanding Water Activity in Gummies
Water activity measures the amount of unbound, "free" water available in a product that microorganisms can use to grow. It is expressed on a scale from 0 to 1. Simply having a low moisture content is not enough; the water must be effectively bound by ingredients like sugars and humectants to lower the aw.
Acceptable Water Activity Levels
For gummy supplements, the generally accepted industry threshold to prevent the growth of bacteria, yeast, and molds is a water activity level below 0.65. At this level, the environment is too dry for pathogenic and most spoilage organisms to proliferate.
- Target Range: Most high-quality gummy supplements are manufactured to maintain a water activity between 0.5 and 0.6.
- Safety Buffer: This range provides a significant safety buffer below the 0.65 limit, accounting for potential minor moisture migration over time.
- Texture Preservation: This level also helps maintain the desired soft, chewy texture without making the gummy sticky or prone to crystallization.
How We Ensure Stability
Controlling water activity is achieved through precise formulation and processing:
- Formulation: Using the correct ratios of sugars (sucrose, corn syrup), humectants (like glycerin), and hydrocolloids (like gelatin or pectin) to bind water molecules.
- Drying: Employing controlled drying steps (like starch bucking or conditioning) to remove excess surface moisture after casting.
- Packaging: Utilizing high-barrier, moisture-resistant packaging to prevent the gummies from absorbing humidity from the environment during storage.
By rigorously controlling water activity from production through packaging, we ensure our gummy supplements remain stable, safe, and effective throughout their shelf life.