Controlling moisture content is a critical step in gummy supplement manufacturing, directly impacting product stability, texture, and shelf life. At KorNutra, we employ a precise, multi-stage process to ensure optimal drying results for every batch.
Key Methods for Monitoring and Controlling Moisture
The process relies on a combination of controlled environmental conditions, consistent monitoring, and standardized procedures.
1. Controlled Drying Environment
The primary control method is managing the drying room or tunnel conditions. Key parameters include:
- Temperature: Maintaining a consistent, moderate temperature to drive out moisture without melting or degrading the gummy's active ingredients.
- Humidity: Actively controlling the ambient humidity level is essential. Dehumidifiers are used to remove moisture from the air, creating a gradient that pulls water from the gummies.
- Airflow: Ensuring uniform air circulation around all products to prevent uneven drying and case hardening (where the exterior dries too quickly, trapping moisture inside).
2. In-Process Monitoring
We do not rely on time alone. Instead, we use direct measurement techniques:
- Moisture Analyzers: Samples are taken at scheduled intervals and tested using precise instruments (like halogen moisture analyzers) to measure water content percentage.
- Weight Tracking: Monitoring the weight loss of sample trays or the entire batch over time provides a reliable, real-time indicator of moisture loss, as water is the primary component being removed.
3. Standardized Procedures & Documentation
Consistency is achieved through strict protocols:
- Validated Drying Schedules: Each gummy formula has a pre-validated drying profile specifying time, temperature, and humidity setpoints.
- Critical Control Points (CCPs): Moisture content is monitored at defined CCPs. Drying continues until the product reaches its target moisture specification, ensuring batch-to-batch uniformity.
- Conditioning: After the gummies reach their target moisture, they rest in a conditioning step so moisture evens out across each piece, preventing a dry surface over a wetter core.
- Final Product Testing: After drying, finished product samples undergo rigorous quality control testing to confirm the moisture content is within the specified range before release.
Moisture Content vs. Water Activity
Moisture content measures how much water a gummy holds. Water activity (aw) measures how much of that water is available to support microbial growth and chemical reactions, and the two often differ. Dissolved sugars and humectants such as glucose syrup bind water, so a gummy can carry 10-20% moisture and stay shelf-stable because its water activity sits low. Typical gummy candy water activity falls between 0.45 and 0.75.
Water activity is the measurement that governs microbial growth. The FDA uses an aw of 0.85 as its regulatory threshold, and molds and yeasts can grow down to about 0.60. Drying lowers both moisture content and aw, but the release specification should control water activity directly. A batch can hit its moisture target and still land outside its aw range if the sugar profile or humectant balance has shifted, so final testing should read aw alongside moisture.
Why Precise Moisture Control Matters
Proper drying lowers water activity enough to stop microbial growth, preserves the correct chewy texture, maintains ingredient potency, and keeps gummies from sticking to each other or to the packaging. Applied the same way on every batch, these controls produce a high-quality, stable, and consistent gummy supplement.