What You Need to Know
Involves ionotropic gelation where calcium ions (Ca²⁺) cross-link guluronic acid blocks in alginate polymers, forming heat-stable gels through egg-box model junctions. The reaction rate is temperature-dependent (Arrhenius kinetics).
Enables creation of stable liquid-filled spheres with varying membrane thicknesses, used for flavor bursts or textural contrasts.
Key Parameters
Temperature
80°C
60°C - 90°C
Time
1-2 minutes
30 seconds - 5 minutes
Equipment
SyringeBathThermometerSodium alginate solutionCalcium chloride bath
Steps
- 1.
Olive oil spheres (El Bulli): Encapsulates lipid flavors while allowing immediate release
- 2.
Cocktail caviar (Modern mixology): Provides alcoholic payloads without dilution
The Science
Primary Reaction
Gelation of Sodium Alginate