When you combine the rapid setting of gellan gum with the slow-drying properties of starch molding, you can create a gummy with a firm shell and a soft core-all in a single deposition step. This unique approach leverages the complementary behaviors of these two gelling systems to achieve a layered texture without needing a secondary coating or multiple processing stages.
Here’s how the process works and what you get:
- Rapid gelation of gellan gum: Gellan gum sets almost instantly upon cooling or in the presence of certain ions. In a single deposition step, this allows the outer layer of the gummy to form a firm, stable shell as soon as it contacts the mold. The rapid set prevents the core and shell from mixing, creating a clear boundary.
- Slow-drying of starch molding: Starch-based molds (like those used in traditional gummy production) absorb moisture slowly. By using a starch mold, the interior of the deposited gummy remains hydrated and soft for a longer period. This slow moisture migration allows the core to remain pliable and tender even as the outer gellan gel firms up.
- Single-step deposition: Instead of forming the shell first, then injecting a soft center (as in two-step methods), this technique deposits the entire gummy in one go. The outer portion, rich in gellan gum, sets fast, while the inner portion, formulated with a higher water activity or added humectants, stays soft because it dries more slowly in the starch mold.
Key benefits of this approach
- Texture contrast: Consumers experience a satisfying firm bite that gives way to a soft, melt-in-the-mouth center.
- Streamlined production: Eliminates the need for an extra coating or injection step, reducing processing time and equipment complexity.
- Consistent quality: Because the shell forms rapidly, there is minimal risk of the core blending with the shell, leading to a uniform product batch after batch.
Formulation considerations
To achieve this texture in a single deposition step, you need to carefully balance the ratio of gellan gum (for the shell) with ingredients that delay setting in the core. Typically, a higher concentration of gellan gum is used on the outside of the deposit, and the core formula might include a lower gellan content, additional starch, or glycerin to slow moisture loss. The starch mold itself also plays a role-selecting a mold with the right moisture absorbency helps control the drying rate of the core.
At KorNutra, we specialize in developing custom gummy formulations that leverage such innovative texture technologies, ensuring your product stands out in the market while meeting all quality and safety standards.