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. 2021 Oct 19;284:114760. doi: 10.1016/j.jep.2021.114760

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Fig. 2 — MSI results from Putterlickia pyracantha stems (Eckelmann et al., 2016). A. Chemical structures of maytansinoids occurring in Putterlickia pyracantha. B. (a) Anatomical imaging of the cross section of Putterlickia pyracantha stems stained with phloroglucinol/HCL. (b–d) MALDI-imaging-HRMS of different Putterlickia pyracantha stem cuttings (spatial resolution: 40 μm; scan area: b: 3720 × 2600 μm; c: 3520 × 4120 μm; d: 3720 × 2600 μm). Localization of maytansine ([M+K]⁺; m/z 730.2503), maytanprine ([M+K]⁺; m/z 744.2659), maytanbutine ([M+K] ⁺; m/z 758.2816), maytansine precursor 6 ([M+K] ⁺; m/z 716.2347), maytanvaline ([M+K]⁺; m/z 772.2973), normaytancyprine ([M+K]⁺; m/z 770.2816), maytansine ([M+K]⁺; m/z 730.2503), hydroxylated maytansine ([M+K]⁺; m/z 746.2452), and hydroxylated maytanprine ([M+K]⁺; m/z 760.2609).