At KorNutra, we approach this formulation challenge with a combination of smart ingredient sourcing, precise manufacturing controls, and rigorous quality assurance. High-maltose corn syrup is a common choice when a lower sweetness profile is desired, for example in protein bars, chews, or gummies. Maltose is about a third as sweet as sucrose, and it is less hygroscopic than the glucose in a standard corn syrup or the fructose in high-fructose corn syrup, which is part of why formulators reach for it. The tradeoff shows up against dry crystalline sugar: any syrup pulls in more moisture from the air than a dry sweetener does, and that added hygroscopicity can lead to stickiness, clumping, or reduced shelf life if not managed correctly.
Ingredient Selection & Formulation
We begin by selecting a high-maltose corn syrup that has a consistent, controlled moisture content. This initial step reduces variability. In the formulation, we often balance the syrup with other low-hygroscopic dry ingredients, such as specific starches or fibers, to create a matrix that minimizes moisture migration. This is not about altering the syrup’s inherent properties but about designing the overall product environment to be less susceptible to moisture uptake.
Specifying the Syrup’s DE and Solids
The syrup’s dextrose equivalent (DE) is the main lever on hygroscopicity. Corn sweeteners absorb moisture more readily as DE rises, because higher-DE syrups carry more glucose. A high-maltose syrup trades most of that glucose for maltose, which is less hygroscopic, so we specify a lower-DE, high-maltose grade for bars and chews that must stay dry. We also pin down the solids level at intake; suppliers sell corn syrup at up to 85% dissolved solids, and fixing that number tells us how much moisture the syrup itself is adding before mixing begins. Two suppliers can ship a syrup with the same maltose claim but different residual glucose, and higher residual glucose means a stickier finished product under the same storage conditions.
Encapsulation & Processing Techniques
In our facility, we use specialized equipment that can handle sticky materials without compromising production speed or product integrity. For instance, we apply:
- Controlled humidity environments - Blending and processing rooms are kept at a strict relative humidity (typically below 40%) to slow moisture absorption during manufacturing.
- Moisture-barrier coatings - When producing chews or soft gels, we apply a thin, edible coating that acts as a shield, preventing the hygroscopic core from drawing in ambient moisture.
- Temperature management - Cooling belts or chilled rollers help set the syrup quickly, reducing the time it is exposed to humid air.
Packaging & Shelf Life Management
Because there is no way to completely eliminate hygroscopicity without changing the syrup, we prioritize packaging that offers a strong moisture barrier. Our standard approach includes:
- High-barrier films or foil pouches - These materials block water vapor ingress almost entirely.
- Desiccant packs or oxygen absorbers - Desiccants capture residual moisture; oxygen absorbers bind oxygen in the headspace to slow oxidation.
- Nitrogen flushing - Replacing air in the headspace with dry nitrogen before sealing further reduces moisture risk.
Quality Assurance & Monitoring
Every batch is tested for initial moisture content and then tracked over time in simulated storage conditions. We measure water activity (Aw) as a critical parameter. Keeping it below 0.60 stops all microbial growth, since even the most xerophilic molds need a higher value to grow, and it minimizes stickiness. If a formulation shows that the high-maltose corn syrup leads to an Aw above the target, we adjust the formula slightly, perhaps adding a small amount of a less hygroscopic sweetener or bulking agent, to bring the system back into balance without raising sweetness.
Practical Example
In one of our popular protein bar products, we use a high-maltose corn syrup blend to avoid an overly sweet taste while still providing the necessary texture. After initial trials, we found the bars were too tacky during warm weather. We solved this by:
- Increasing the proportion of soluble fiber in the mix.
- Using a cooling tunnel immediately after forming.
- Packaging in a foil laminate with a built-in moisture scavenger.
The result is a bar with the desired moderate sweetness that stays non-sticky for its entire shelf life.
Key Takeaway
There is no single “magic bullet” for handling high-maltose corn syrup’s hygroscopicity. Instead, we use a systematic method that combines careful formulation, controlled processing, and smart packaging. This allows us to deliver the product profile you want, lower sweetness, without compromising on quality or stability. If you are developing a supplement that could benefit from this approach, we would be happy to discuss your specific needs.