00884 IUPAC Gold Book - catalytic activity fraction 10.1351/goldbook.C00884 C00884 current synonym: catalytic fraction 1 Quotient of the catalytic activity of the isozyme and the catalytic activity of all the isozymes of the same enzyme in the system. The term catalytic fraction is accepted for use in clinical chemistry. The definition is based on the definitions of catalytic activity and fraction. The definition also applies to other multiple forms of an enzyme that are not isoenzymes. catalytic activity https://goldbook.iupac.org/terms/view/C00881 fraction https://goldbook.iupac.org/terms/view/F02494 isozyme https://goldbook.iupac.org/terms/view/I03358 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/C00884/html https://goldbook.iupac.org/terms/view/C00884/json https://goldbook.iupac.org/terms/view/C00884/plain Citation: 'catalytic activity fraction' 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.C00884 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. 2026-05-14T23:33:13+00:00