{"term":{"id":"08762","title":"selectively-labelled isotopic tracer","longtitle":"IUPAC Gold Book - selectively-labelled isotopic tracer","doi":"10.1351\/goldbook.08762","code":"08762","status":"current","definitions":[{"id":1,"text":"An isotopically labelled compound is designated as selectively labelled when a mixture of isotopically substituted compounds is formally added to the analogous isotopically unmodified compound in such a way that the position(s), but not necessarily the number, of each labelling nuclide is defined.","notes":{"1":"A selectively labelled compound may be considered a mixture of specifically-labelled isotopic tracers."},"sources":["PAC, 2021, 93, 69. 'Vocabulary of radioanalytical methods (IUPAC Recommendations 2020)' on page 102 (https:\/\/doi.org\/10.1515\/pac-2019-0302)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/08762\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/08762\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/08762\/plain"},"citation":"Citation: 'selectively-labelled isotopic tracer' 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.08762","license":"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.","collection":"If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org .","disclaimer":"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.","accessed":"2026-06-13T13:26:40+00:00"}}