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Katal
Definition and Synonyms

Definition: The SI 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 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. The katal is too large for most purposes and is usually encountered as the microkatal, nanokatal or picokatal. Non-SI unit called unit (U) defined as micromoles per minute is commonly used, but its definition lacks coherence with the SI system.

Synonyms: Katal, kat

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