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. 2020 Sep 17;11:581508. doi: 10.3389/fmicb.2020.581508

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Copyright © 2020 Rai, Fisher, Duckworth and Baars.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Tentative identification of siderophores in unspiked soil samples by LC-MS. (A) Rhizoferrin peak in soil sample S2 with two internal standard additions. A chromatogram for an extract of soil S1 in which no rhizoferrin was detected is shown for comparison. (B) Rhizoferrin internal standard calibration line. (C) Tentative identification of the aerobactin-Fe complex in soil S1 and structure of aerobactin. (D) Tentative identification of vibrioferrin in soil S51 and structure of vibrioferrin.