Description
Cold water extraction preserves kombu's glutamic acid while minimizing polysaccharide dissolution.
Technical
Laminaria japonica cell walls slowly release free glutamate (C₅H₈NO₄⁻) and aspartic acid at 4-10°C, with minimal conversion of alginic acid polymers to soluble alginates that cause sliminess. The process maintains kelp's natural nucleotide content (IMP, GMP) that synergizes with glutamate.
Culinary Significance
Produces a clean, marine umami base without the viscous texture of hot-prepared dashi, ideal for delicate applications.
Science
Primary Reaction
Passive diffusion of glutamic acid through cell membranes
Parameters
Temperature
6°C optimal
2°C to 12°C range
Time
12 hours
8 hours – 18 hours
Equipment
Non-reactive container (glass/ceramic)Cheesecloth (90 micron mesh)Refrigeration system