Protein Denaturation: What Heat Actually Does

Protein denaturation — the unfolding of protein's three-dimensional structure under heat — is the fundamental event in every form of protein cooking. Understanding the specific temperatures at which different proteins denature in different contexts (wet vs dry heat, muscle type, collagen vs muscle fibre) provides precise control over texture that "cook until done" never achieves.

• The Japanese concept of *shime* (the binding or setting of fish) in sashimi preparation applies salt and acid to partially denature surface proteins and change the texture of raw fish
• The Chinese technique of velveting (coating meat in cornstarch and egg white before brief blanching) creates a protein barrier that protects against direct heat denaturation during stir-frying