Katal

**Semantic type:** Quantitative Concept

**Definition:** A unit for measuring catalytic (e.g. enzymatic) activity, the ability of the compound to accelerate the chemical reaction by providing a lower energy pathway between the reactants and the products. One katal is that catalytic activity which will raise the rate of reaction by one mole per second in a specified assay system. When the katal is used, the measurand should be specified by reference to the measurement procedure; the measurement procedure must identify the indicator reaction. The katal is not used to express a rate of reaction itself, which should be expressed in moles per second. Katal is coherent with the SI.

**Synonyms:** - kat - kat - kat - kat - kat - kat - kat - katal - katal - katal