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. 2017 Oct 11;8:1973. doi: 10.3389/fmicb.2017.01973

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Copyright © 2017 Fan, Zhang, Li, Zhang, Duan and Wang.

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) or licensor 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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LC-MS/MS analysis of lipopeptide crude extracts from B. subtilis 9407 and commercial standard for surfactin. (A,C,E,G) The MS/MS spectrums of surfactin standard with negative ion mode (ES-) and positive ion mode (ES+). (B,D,F,H) The MS/MS spectrums of lipopeptide crude extracts from B. subtilis 9407 with ES- and ES+.