Description
Rhubarb's oxalic acid induces conformational changes in fish proteins similar to thermal denaturation.
Technical
Oxalic acid (C2H2O4) chelates calcium ions and disrupts electrostatic interactions in myofibrillar proteins, particularly actin-myosin crossbridges. The pH-dependent process (optimal 2.8-3.2) causes partial unfolding of tertiary structures.
Culinary Significance
Creates 'cooked' texture in raw seafood while preserving delicate flavors lost during heating.
Science
Primary Reaction
acid-induced protein denaturation
Parameters
Temperature
8°C optimal
4°C to 12°C range
Time
8-12 hours
4 hours – 18 hours
Equipment
ceramic or glass containerpH strips (range 1-4)refrigeration