Catalytic-activity concentration (cat.c.)
Synonym |
Catalytic concentration | ||
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Abbreviation |
Cat.c. | ||
Definition in words |
Catalytic-activity of component B divided by volume of system 1 Note: Component B is a catalytic component |
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Definition by equation |
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Systematic terms
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Catalytic-activity concentration of component B in system 1 | ||
Result type |
Rational scale |
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Numerical values from 0-∞ |
Unit |
nkat/L, µkat/L, kat/L, U/L, kU/L etc. Note 1: Katal (abbreviated “kat”) is recommended unit for catalytic-activity kind-of-quantity. (katal=mol/s) Note 2: Enzyme unit (abbreviated “U”) is acceptable for use (e.g. U, kU) but it is recommended to use katal. (Enzyme unit=µmol/min) |
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Special rule(s) in the NPU syntax |
The catalytic component (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 the NPU code and there may be difficulties in comparing values for the same NPU code. |
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Non-recommended term |
Enzyme concentration, concentration of enzyme activity, enzyme activity, catalyst concentration | ||
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. doi:10.1039/9781782622451. |
Laboratory field |
Examples |
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Clinical Chemistry |
Example 1 | |
Generic abbreviated |
NPU19986 P—Amylase, pancreatic type; cat.c.(IFCC 2006) = ? µkat/L | |
Full result | NPU19986 Plasma—Amylase, pancreatic type; catalytic-activity concentration(IFCC 2006) = 0.9 microkatal per litre | |
Abbreviated result | NPU19986 P—Amylase, pancreatic type; cat.c.(IFCC 2006) = 0.9 µkat/L | |
Written expression | The catalytic-activity concentration of Amylase, pancreatic type in Mr. Smith’s plasma is [0.9] µkat/L. The measurement is performed according to a procedure defined by IFCC in 2006. | |
Equation
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Notes
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The procedure defined by IFCC in 2006 is described in International Federation of Clinical C, Laboratory M, Schumann G, Aoki R, Ferrero CA, Ehlers G, et al. IFCC primary reference procedures for the measurement of catalytic activity concentrations of enzymes at 37 degrees C. Clin Chem Lab Med. 2006;44(9):1146-55. | |
Molecular Biology and Genetics |
Example 2 | |
Generic abbreviated | NPU01379 P—Biotinidase; cat.c.(37 °C; proc.) = ? nkat/L | |
Full result | NPU01379 Plasma—Biotinidase; catalytic-activity concentration(37 °C; procedure) = 445 nanokatal per litre | |
Abbreviated result | NPU01379 P—Biotinidase; cat.c.(37 °C; proc.) = 445 nkat/L | |
Written expression | The catalytic-activity concentration of Biotinidase in Mr. Smith’s plasma is [445] nkat/L. The measurement is performed at 37 °C according to a procedure defined by the laboratory. | |
Equation |
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Reprocution and Fertility |
Example 3
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Generic abbreviated |
NPU57184 SemP—Prostatic acid phosphatase; cat.c.(37 °C; proc.) = ? U/L | |
Full result | NPU57184 Seminal plasma—Prostatic acid phosphatase; catalytic-activity concentration(37 °C; procedure) = 20 Enzyme unit per litre | |
Abbreviated result | NPU57184 SemP—Prostatic acid phosphatase; cat.c.(37 °C; proc.) = 20 U/L | |
Written expression | The catalytic-activity concentration of Prostatic acid phosphatase in Mr. Smith’s seminal plasma is [20] U/L. The measurement is performed at 37 °C according to a procedure defined by the laboratory. | |
Equation | ||
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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Ordinal 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 concentration
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Reference |
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Date | Term | Note |
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1996-01-01 | Catalytic-activity concentration | Term established |
NPU term identifier |
QU50032 |
Date | Notes |
Example |
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2019-03-20 |
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. 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. doi:10.1039/9781782622451. P.162, §9.97.2. |
The enzyme and protein nomenclatures can have different terms for the same molecule.
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2019-03-20 |
“Besides the effect of termperature on catalytic activity, temperature affects the volume and therefore the catalytic-activity concentration.” 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. doi:10.1039/9781782622451. P.162, §9.97.2. |