Gelation

Gelation is the setting of a liquid into a gel, a soft solid that holds water in a network of molecules.

Gelation: A clear fruit jelly dessert turned out of a mold, glossy and wobbling with a smooth set surface
  • Food science and baking chemistry

Also called: gel formation

A hydrocolloid is a substance that forms a gel in contact with water. In desserts, the usual gelling agents are gelatin, pectin and starch, along with agar and others.

Gels fall into two kinds. Thermo-reversible gels, such as gelatin and agar, melt when reheated and set again on cooling. Thermo-irreversible gels, such as those made with cornstarch or pectin, do not melt back on reheating.

Gelation is behind panna cotta, fruit jellies, pie fillings and puddings. Excess heat can evaporate water and shrink a gel, and a gel that tightens up over time may release liquid, which is called weeping or syneresis. Cooks control gel strength through the amount of gelling agent, the sugar and acid present, and the cooling.

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Written by VanillaGoods in our own words from these sources. Last reviewed October 15, 2026.

  1. 1.2: Gelatinization, LibreTexts Workforce (Modern Pastry and Plated Dessert Techniques)