Description
Cold-water extraction of glutamates and nucleotides from kombu seaweed while minimizing bitter compounds.
Technical
Osmotic diffusion extracts water-soluble glutamic acid (primary umami compound) and adenosine 5'-monophosphate (AMP) without activating bitter-tasting alginates or polyphenols that heat would release.
Culinary Significance
Creates a delicate, pure umami base for dashi without the astringency of hot-brewed kombu, ideal for chilled applications.
Science
Primary Reaction
Extraction of glutamates and nucleotides
Parameters
Temperature
5°C optimal
0°C to 15°C range
Time
12 hours
4 hours – 24 hours
Equipment
Glass containerFine mesh strainer