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Free electron interaction with genistein: positive and negative ion formation
Vy T T Nguyen1,2, Jiakuan Chen1,2, Milan Ončák1
1Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck Technikerstrasse 25 A-6020 Innsbruck Austria milan.oncak@uibk.ac.at stephan.denifl@uibk.ac.at.
RSC Advances
|November 28, 2025
Summary
Researchers studied genistein, a plant isoflavone, using electron interactions. The study identified intact genistein anions and specific fragment cations, revealing insights into genistein
Area of Science:
- Chemical Physics
- Molecular Spectroscopy
- Biochemistry
Background:
- Genistein, a prominent isoflavone found in edible plants, is recognized for its health-promoting properties.
- Isoflavones are a class of flavonoids with diverse biological activities.
- Understanding the molecular behavior of genistein under energetic conditions is crucial for its application.
Purpose of the Study:
- To investigate the fragmentation patterns of neutral genistein upon electron interaction.
- To identify the anionic and cationic species formed from genistein.
- To determine the energetic thresholds for ion formation pathways.
Main Methods:
- Utilized a crossed beam experiment combined with mass spectrometry.
- Subjected neutral genistein to electron impact with kinetic energies ranging from 0 eV to 70 eV.
- Performed quantum chemical calculations to support experimental findings on threshold energies.
Main Results:
- The intact negatively charged genistein was the most abundant anionic species observed.
- Dehydrogenated parent anion was the sole fragment anion formed via dissociative electron attachment.
- Prominent cations included parent and dehydrogenated species, alongside ions from retro-Diels-Alder rearrangement.
Conclusions:
- Electron interaction with genistein primarily yields the intact parent anion.
- Specific fragmentation pathways, including retro-Diels-Alder rearrangement, contribute to cation formation.
- Experimental and computational results align, validating the observed ion formation energies.
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