Catalytic-activity (cat.act.)
Synonym |
Enzyme activity, enzymatic activity, catalytic amount | ||
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Abbreviation |
Cat.act. | ||
Definition in words |
Difference of amount-of-substance of component D at two points of time divided by the difference of elapsed time | ||
Definition by equation |
Note 1:Component B is catalytic component that has a property that can convert substance to a reaction product in a chemical reaction Note 2: Component D may either be substance or reaction product |
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Systematic terms |
Catalytic-activity of component B in system 1 | ||
Result type |
Rational scale |
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Numerical values from 0-∞ |
Unit |
nkat, µkat, kat, U, kU, pU etc. Note 1: Katal, (abbreviated “kat”), is recommended unit for catalytic-activity kind-of-quantity. (katal=mol/s) Note 2: Enzyme unit, “U”, is acceptable for use (e.g. U, kU) but it is recommended to use katal. (U=µmol/min) |
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Special rule(s) in the NPU syntax |
Component B is termed according to the International Enzyme Nomenclature (see Medical and metrological vocabulary). “Procedure” is stated in the specification to the kind-of-property in the NPU definition. “Procedure” indicates that the measurement procedure must be stated somewhere else than in the NPU code and there may be difficulties in comparing values for the same NPU code. |
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Non-recommended term |
Amount of enzyme, amount-of-catalyst | ||
Reference |
Ferard G, Dybkaer R, Fuentes-Arderiu X. Compendium of Terminology and Nomenclature of Properties in Clinical Laboratory Sciences : Recommendations 2016. 1 ed: Royal Society of Chemistry; 2016. 182 p. |
Laboratory field |
Example |
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Clinical Chemistry |
Generic abbreviated | Ercs(B)—Glutathione peroxidase; cat.act.(37 °C; proc.) = ? akat |
Full result | Erythrocytes(Blood)—Glutathione peroxidase; catalytic-activity(37 °C; procedure) = ? attokatal | |
Abbreviated result | Ercs(B)—Glutathione peroxidase; cat.act.(37 °C; proc.) = ? akat | |
Written expression | The catalytic-activity of Glutathione peroxidase of Erythrocytes in Mr. Smith’s blood is [?] akat. The measurement is performed at 37 °C according to a procedure defined by the laboratory | |
Equation |
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Notes | Catalytic-activity is currently not in use in NPU codes. (see Details section) | |
Reference |
NPU database, https://www.ifcc.org/ifcc-scientific-division/sd-committees/c-npu/npusearch/ and http://www.labterm.dk/default.aspx |
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Kind-of-property
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Nominal kind-of-property
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Kind-of-quantity
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Unitary kind-of-quantity
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Rational unitary kind-of-quantity
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Catalytic-activity
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Reference |
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Date | Term | Note |
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2019-06-04 | Catalytic-activity | Term is not in use in NPU codes (see details section) |
NPU term identifier |
None |
Date | Notes |
Example |
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2019-06-04 |
Catalytic-activity has not been and is currently not in use in NPU codes. The example from the example section reflects a measurement of catalytic-activty of total glutathione peroxidase in all erythrocytes in the patient’s blood. This is currently not technical feasible. Instead, catalytic-activity may be used in combination with modifiers (e.g. concentration, content, fraction etc.), e.g. catalytic-activity concentation, catalytic-activity content etc. |
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2019-06-04 |
Catalytic component B is an enzyme, defined by the international enzyme nomenclature (https://www.expasy.org/), and shall be used for catalytic-activity kinds-of-property. Proteins are defined and termed by UNIPROT (https://www.uniprot.org/) and should not be used in relation to catalytic-activity kinds-of-property. Though there are overlaps between these two nomenclatures.. |
The enzyme and protein nomenclatures can have different terms for the same molecule.
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