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enzyme activityThe size, that is, the amount of enzyme, is expressed in the unit of enzyme activity (U) (active unit).In 1961, the International Biochemical Society Enzymology Committee proposed to adopt the unified“International unit”(IU) to represent the activity of enzyme, which is specified as: under the optimal conditions (25 ℃), catalyze 1 μ g/minmole(μ mol) The amount of enzyme required for substrate conversion into products is set as an activity unit, that is, 1IU=1 μ mol/min.
enzyme activityThe size, that is, the amount of enzyme, is expressed in the unit of enzyme activity (U) (active unit).In 1961, the Enzymology Committee of the International Biochemical Society proposed to use a unified "International Unit" (IUmoleThe amount of enzyme required for the conversion of (μ mol) substrate into product is set as an activityCompanyThat is, 1IU=1 μ mol/min.In this way, the enzyme content can be expressed by the number of enzyme activity units per gram of enzyme preparation or per milliliter of enzyme preparation (U/g or U/ml).
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Vital unit:Measuring enzyme catalytic capacityCustomary unit:Substrate (or product) change/unit timeInternational Units (IU):1 μ mol change/minKatal（Kat）：1moL change/second.1 Kat = 6×tenI.U 。
