Description
pH-controlled gelation where calcium alginate spheres form only after acidic ingredients neutralize.
Technical
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.
Culinary Significance
Enables encapsulation of acidic liquids (citrus juices, vinegars) without premature gelation, creating liquid-center spheres.
Science
Primary Reaction
Ionic crosslinking of guluronic acid residues
Parameters
Temperature
15°C optimal
4°C to 25°C range
Time
2 minutes
30 seconds – 5 minutes
Equipment
Precision pH meterSyringe/dropperCalcium bath container