09760 IUPAC Gold Book - peptide precursor ion 10.1351/goldbook.09760 09760 current 1 Peptide ion generated during the ionisation of peptides in an ion source or during tandem mass spectrometry of an intact protein in top-down proteomic analysis, selected for further analysis by means of tandem mass spectrometry. Once generated, a peptide fragment ion may become a precursor ion for tandem mass spectrometry of higher orders (\({\rm{MS}}^{n}\), \(n = 3\)). top-down proteomic https://goldbook.iupac.org//terms/view/09786 PAC, 2018, 90, 1121. 'Terminology of bioanalytical methods (IUPAC Recommendations 2018)' on page 1159 (https://doi.org/10.1515/pac-2016-1120) https://goldbook.iupac.org/terms/view/09760/html https://goldbook.iupac.org/terms/view/09760/json https://goldbook.iupac.org/terms/view/09760/plain Citation: 'peptide precursor ion' 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.09760 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. 2026-04-18T05:35:03+00:00