References in periodicals archive ?
In addition, the katal is invariant of the measurement procedure, although the numerical value of a result depends on the procedure.
Flushed with the newly achieved international consensus, the IFCC, through the NPAC, proposed the special term and symbol, katal and kat, to the Consultative Committee for Units (CCU) of the International Committee for Weights and Measures (CIPM).
This setback did not hinder the adoption of the katal by a few journals, certificates on enzyme reference materials from the European Community Bureau of Reference (BCR), the European Pharmacopoeia (22), the NPAC / IFCC Compendium of Terminology and Nomenclature of Properties in Clinical Laboratory Sciences (20), and notably the IUPAC/IFCC database of thousands of systematic terms for properties, including those with enzyme analytes (23).
The spread of the katal in routine medical laboratory reporting, however, has been sporadic, and apart from general inertia, the argument was often advanced that the special term lacked adoption by CGPM for use with the SI.
Consequently, the IFCC/NPAC Committee/Commission on Nomenclature, Properties and Units formulated an official IFCC petition, 1998-05, to the CIPM (24), arguing that the term katal (a) suggests a property of a catalyst rather than of a chemical reaction; (b) allows the presentation of values in laboratory medicine of, e.
In the end, the CCU penned Recommendation U 1 (1998) 'Special name for the SI unit mole per second, the katal, for the expression of catalytic activity' [page 54 in Ref.
CCU Recommendation U 1 was supported with the further recommendations (27) that 'when the katal is used the measurand must be specified by reference to the measurement procedure, which must identify the indicator reaction .
The katal is now adopted under the Convention of the Metre of 1875 by the highest metrologic authority, the intergovernmental diplomatic CGPM, to express quantity values of catalytic activity of enzymes and other catalysts in any field of science and technology.
Catalytic activity concentration (b): katal per litre (kat/L; kat/1)