Catalytic-activity coefficient (cat.coefficient)

Abbreviation

Cat.coefficient

Definition in words

Catalytic-activity of component F divided by coefficient of component G in system 1

Note 1: Coefficient can be a kind-of-quantity that is not e.g. volume, mass.

Note 2: Component B is the quotient of catalytic-activity of component F and a kind-of-quantity of component G in system 1

Note 3: Component F (catalytic component, e.g. an enzyme) ≠ Component G

Note 4: Component F is not related to or a part of component G

Definition by equation

Systematic terms

Catalytic-activity coefficient of component B in system 1
Ratio scale
  • Value sets are positive numerical values
  • Algebraic operations are allowed (a=nb; a≠nb)
Numerical values from 0-∞

Unit

mkat/mol, kU/mol, µkat/kg, etc.

Note 1: Katal, “kat”, is recommended unit for catalytic-activity kind-of-quantity. (kat=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)

Note 3: The denominator unit depends on the coefficient.

Special rule(s) in the NPU syntax

The catalytic component (component F) 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.

The coefficient must be specified in the specification to the kind-of-property in the NPU definition.

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

Molecular Biology and Genetic

Example 1
Generic abbreviated
NPU53036 B—Pyruvate kinase/Haemoglobin(Fe); cat.coefficient(cat.act./am.s.;37 °C; proc.) = ? kU/mol
Full result NPU53036 Blood—Pyruvate kinase/Haemoglobin(Fe); catalytic-activity coefficient(catalytic-activity/amount-of-substance;37 °C; proc.) = 46 kU/mol
Abbreviated result NPU53036 B—Pyruvate kinase/Haemoglobin(Fe); cat.coefficient(cat.act./am.s.;37 °C; proc.) = 46 kU/mol
Written expression The catalytic-activity coefficient (catalytic-activity/mass) of Pyruvate kinase/Haemoglobin(Fe) in Mr. Smith’s blood is [46] kU/mol. The measurement is performed at 37 °C according to a procedure defined by the laboratory.
Equation

Example 2
Generic abbreviated NPU58562 B—Glucose-6-phosphate dehydrogenase/Haemoglobin(Fe); cat.coefficient(37 °C; cat.act./mass; proc.) = ? µkat/kg
Full result NPU58562 Blood—Glucose-6-phosphate dehydrogenase/Haemoglobin(Fe); catalytic-activity coefficient(37 °C; catalytic-actitivty/mass; procedure) = 21 µkat/kg
Abbreviated result NPU58562 B—Glucose-6-phosphate dehydrogenase/Haemoglobin(Fe); cat.coefficient(37 °C; cat.act./mass; proc.) = 21 µkat/kg
Written expression The catalytic-activity coefficient (catalytic-activity/mass) of Glucose-6-phosphate dehydrogenase/Haemoglobin(Fe) in Mr. Smith’s blood is [21] µkat/kg. 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
  • Kind-of-property

    • Nominal kind-of-property

    • Kind-of-quantity

      • Ordinal kind-of-quantity

      • Unitary kind-of-quantity

        • Rational unitary kind-of-quantity

          • Catalytic-activity coefficient

Reference

  • Dybkaer R. Concept system on ‘quantity’: formation and terminology. Accredit Qual Assur. 2013;18(3):253-60.
  • Dybkaer R. ISO terminological analysis of the VIM3 concepts ‘quantity’ and ‘kind-of-quantity’. Metrologia. 2010;47(3):127-34.
Date Term Note
2015-01-19 Catalytic-activity coefficient Term established
Date Notes

Example

2019-03-21 Examinations using catalytic-activity coefficient (catalytic-activity/amount-of-substance) may have the same type of unit (e.g. kU/mol) as for examinations using molar catalytic activity. Molar catalytic-activity is the quotient of catalytic-activity of component B and amount-of-substance of the same component.
2019-06-04 Examinations using catalytic-activity coefficient (catalytic-activity/mass) may have the same type of unit (e.g. kU/kg) as for examinations using catalytic-activity content. Catalytic-activity content is the quotient of catalytic-activity of component B and mass of system 1.