The ability to demold starch-molded gummies without tearing hinges on critical parameters like gel strength, elasticity, and surface tack - all of which are deeply influenced by the soluble solids content, measured in °Brix. In traditional formulations, sugar (sucrose and glucose syrup) contributes the bulk of these solids, typically targeting 76-82°Brix to ensure a clean release from the starch mold. When sugar is reduced, the Brix drops, weakening the gel network and increasing stickiness, which can cause the gummy to tear as it’s lifted from the impression. So, the technical challenge is to find the lowest Brix that still yields enough mechanical integrity.
Through advanced hydrocolloid blending and the strategic use of sugar alternatives, it is possible to push that boundary significantly. By replacing sugar with high-performance gelling systems - such as specialized pectins, gelatins with high bloom strength, or synergistic gum combinations - and incorporating low-calorie bulking agents like polyols (maltitol, erythritol) and soluble fibers (inulin, polydextrose), the Brix can be reduced while preserving a firm, resilient gel. Typical sugar-reduced gummies may operate in the 65-70°Brix range, but truly boundary-pushing formulations at KorNutra have been successfully demolded at levels as low as 55-60°Brix without tearing, provided that the starch molding conditions, conditioning time, and release agents are precisely optimized.
Why Brix matters for demolding
Soluble solids serve multiple roles: they control water activity for shelf stability, regulate setting speed, and most critically, determine the co‑operative behavior of the gel network. Lower Brix means more free water, which plasticizes the gel, making it softer and more prone to cohesive failure under the mechanical stress of demolding. At the same time, reduced solids increase hygroscopicity, causing the gummy surface to become sticky and adhere to the starch dust. Without sufficient gel structure, the candy literally rips apart when pulled from the mold.
How the boundary is pushed
KorNutra’s approach to ultra‑low‑sugar gummies leverages a triple strategy:
- Optimized gel architecture: Using tailored pectin‑gelatin hybrids or amidated pectins that form strong gels even at reduced solids. Higher‑bloom gelatin or specific carrageenan‑blended systems provide the necessary tear resistance.
- Functional bulk sweeteners: Polyols do more than sweeten - they mimic sugar’s textural role but with fewer calories. Maltitol syrups, for instance, can build back some Brix while offering a clean demolding surface. Soluble fibers further reinforce the matrix without contributing to sweetness or tooth‑friendly claims.
- Process fine‑tuning: Starch moisture content, mold profile, and resting time are adjusted to match the formulation. A slightly drier mold bed and a longer conditioning phase allow the gel to strengthen before demolding, compensating for the lower Brix.
By balancing these elements, KorNutra’s R&D team has demonstrated that gummies with as little as 55°Brix can be demolded flawlessly - a feat that redefines what is possible in sugar‑reduced confectionery. This pushes the boundary because it enables products that achieve genuinely low sugar declarations (often < 2 g per serving) without compromising the consumer’s sensory experience or manufacturing efficiency. It opens the door for supplements and nutraceuticals that need to deliver specific active ingredients in a palatable, sugar‑free format, all while maintaining the clean release and appealing shape that starch molding is known for.
Ultimately, the quest for the lowest Brix is a continuous innovation journey. Each reduction forces formulators to rethink the interplay of ingredients and process, but the reward is a cleaner‑label, lower‑calorie gummy that performs just as well as its full‑sugar counterpart.