Katal
Katal
SI derived unit of catalytic activity
The katal (symbol: kat) is that catalytic activity that will raise the rate of conversion by one mole per second in a specified assay system.[1] It is a unit of the International System of Units (SI)[1] used for quantifying the catalytic activity of enzymes (that is, measuring the enzymatic activity level in enzyme catalysis) and other catalysts.
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The unit 'katal' is not attached to a specified measurement procedure or assay condition, but any given catalytic activity is: the value measured depends on experimental conditions that must be specified.[2][3] Therefore, to define the quantity of a catalyst in katals, the catalysed rate of conversion (the rate of conversion in presence of the catalyst minus the rate of spontaneous conversion) of a defined chemical reaction is measured in moles per second.[4] One katal of trypsin, for example, is that amount of trypsin which breaks one mole of peptide bonds in one second under the associated specified conditions.[clarification needed]