EDTA tetrasodium tetrahydrate is a metal chelator known for its ability to bind with divalent and trivalent metal cations, including calcium. It exhibits antihypercalcemic and anticoagulant properties. This compound reduces metal ion-catalyzed oxidative damage to proteins and maintains a reducing environment during protein purification processes, making it commonly used for protein purification and storage. Additionally, it helps in minimizing the formation of disulfide bonds.