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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)-mass spectrometry imaging (MSI) analysis of the outer epidermis of the peanut testa. (A) Optical image of the peanut longitudinal section before MALDI-MSI analysis. This is the same optimal image shown in Figure 2A. (B) Mass spectrum extracted from the outer epidermis of the peanut testa is indicated by the region filled in red in Figure 3A using the region of interest function. The m/z values indicated that the peaks were possibly attributable to flavan-3-ols. Representative ion images at m/z (C) 289.1, (D) 575.1, (E) 577.1, (F) 861.2, (G) 863.2, (H) 1149.3, and (I) 1151.3. The dotted white line shows the analyzed region. Scale bar = 2 mm.