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. 2020 May 20;25(10):2373. doi: 10.3390/molecules25102373

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Matrix-assisted laser desorption/ionization (MALDI)-tandem mass spectrometry (MS/MS) analysis of a peanut section. MALDI-MS/MS spectra were obtained from the outer epidermis of the testa of the peanut section after MALDI-mass spectrometry imaging. Representative MS/MS spectra of precursor [M − H]⁻ ions at m/z (A) 289.1, (B) 575.1, (C) 577.1, (D) 861.2, (E) 863.2, (F) 1149.3, and (G) 1151.3. The fragment ion peaks with m/z values generated by retro-Diels-Alder (RDA), heterocyclic ring fission (HRF), and quinone methide (QM) reactions were used for molecular assignments.