00883 IUPAC Gold Book - catalytic activity content 10.1351/goldbook.C00883 C00883 current synonym: catalytic content 1 Catalytic activity of the component divided by the mass of the system. In clinical chemistry the component is usually an enzyme. The term catalytic content is accepted for use in clinical chemistry. Use of the term level as a synonym for concentration is deprecated. In describing a quantity, content must be clearly differentiated from concentration. concentration https://goldbook.iupac.org//terms/view/C01222 content https://goldbook.iupac.org//terms/view/C01296 PAC, 1996, 68, 957. 'Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)' on page 964 (https://doi.org/10.1351/pac199668040957) https://goldbook.iupac.org/terms/view/C00883/html https://goldbook.iupac.org/terms/view/C00883/json https://goldbook.iupac.org/terms/view/C00883/plain Citation: 'catalytic activity content' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.C00883 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-04-27T16:03:22+00:00