Chelate: Definition, Chemistry & Medical Applications

The word "chelate" is used in chemistry and zoology as an adjective. It is used as a verb in chemistry and medicine. It is also used as a noun in chemistry and medicine. The different ways the word is used all stem from the Greek "chely," which is the large claw of a lobster or other crustacean.

Chelate as a Noun in Chemistry and Medicine

• As a noun in chemistry and medicine, a chelate is a molecule that has a metal ion with at least two bonds to non-metal atoms in the same molecule. Example: Ethylenediaminetetraacetic Acid (EDTA) can form a chelate with many different metals.

Chelate as an Adjective in Chemistry

• As an adjective in chemistry, chelate means having a central metal ion attached to two or more non-metal atoms in the same molecule. Example: Iron forms a chelate complex with a compound called heme in your blood, which then can hold onto an oxygen molecule to transport the oxygen to where it is needed in your body.

Chelate as a Verb in Chemistry

• As a verb in chemistry, chelate means to combine or react with a metal ion to form a chelate ring. Example: EDTA chelates calcium to form the calcium salt of EDTA.

Chelate as a Verb in Medicine

• As a verb in medicine, chelate means to remove a heavy metal from the blood using a chelate. Example: The lead was chelated out of the patient's blood using EDTA.

Chelate as an Adjective in Zoology

• As an adjective in zoology, chelate means having a pincer-like appendage, usually a leg. Example: Some species of lobster have chelate front legs.