What You Need to Know
Alginate polymerization is inhibited by low pH (H+ ions compete with Ca2+ for binding sites), delaying gelation until pH rises above 3.5 through diffusion or ingredient buffering.
Enables encapsulation of acidic liquids (citrus juices, vinegars) without premature gelation, creating liquid-center spheres.
Key Parameters
Temperature
15°C
4°C - 25°C
Time
2 minutes
30 seconds - 5 minutes
Equipment
Precision pH meterSyringe/dropperCalcium bath container
Steps
- 1.
Liquid mozzarella spheres (elBulli): Encases acidic tomato water
- 2.
Margarita cocktail spheres (The Aviary): Delays gelation until salt rim contact
The Science
Primary Reaction
Ionic crosslinking of guluronic acid residues