From the perspective of a single sugar crystal entering the gummy production line, its journey is a precise balance of heat, moisture, and time. At KorNutra, we guide each crystal through controlled phases to hit that perfect gummy texture: chewy, stable, and shelf-stable, with no unwanted graininess.
Phase 1: Dissolution
The crystal lands in the water and corn syrup mix and dissolves quickly. Sucrose is highly soluble even in lukewarm water, so the crystal breaks down long before the syrup nears 240°F (115°C). Water molecules wedge between sucrose molecules and pull the lattice apart. The cook that follows drives off water and concentrates the syrup to the 78 to 80 Brix a gelatin gummy needs.
Phase 2: Amorphous State
Once dissolved, the sugar molecules hang in a supersaturated solution. When the cook ends and the syrup cools, hydrated gelatin is added, because boiling denatures the protein and weakens the gel. The sugar doesn't re-form crystals. It stays amorphous, meaning non-crystalline, held inside the gelatin network as the mix sets into a rubbery gel. Hard candy is a sugar glass, dry and brittle. A gummy sits above its glass transition and stays chewy because the gel holds it together. Cool too slowly or agitate the syrup, and crystals seed. Rapid cooling with steady mixing keeps the sugar non-crystalline.
Phase 3: Recrystallization (Controlled)
In fondants and some caramels, controlled recrystallization is done on purpose, and it's called graining. In a soft gummy, it's a defect. If moisture evaporates too fast or temperatures swing, tiny crystals form and make the gummy gritty. At KorNutra, our drying and cooling chambers lock in the amorphous state with steady, low-humidity conditions.
What determines the final outcome?
- Temperature and time: Rapid cooling favors amorphous; slow cooling can allow reordering into crystals.
- Moisture content: Too much water left acts as a solvent, letting crystals form over weeks. We dry to a precise water activity.
- Inhibitors: Ingredients like corn syrup and gelatin get in the way of crystal formation, stabilizing the amorphous state.
When the crystal is not sucrose
Everything above assumes sucrose. Sugar-free and reduced-sugar gummies replace it with sugar alcohols or rare sugars such as allulose, and each sweetener carries its own solubility and glass transition behavior. A formulation that stays smooth as sucrose can grain or turn sticky when the sweetener is swapped, because the replacement holds water differently and can crystallize at a different point in drying. Sweeteners also differ in how hygroscopic they are, which shifts the drying step. A sugar-free line is a separate development project, not a one-for-one substitution: cooker settings, water activity target, and cooling profile all shift. If you plan both a conventional and a sugar-free version of the same gummy, expect two separate validation runs.
For a single crystal entering our line, the full path is: it dissolves early in the cook, then the molecules stay amorphous inside the gel through cooling and drying. Keep conditions consistent, and they stay that way, giving you a perfectly smooth gummy every time.