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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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Analysis of lipopeptide crude extracts from B. subtilis 9407 and commercial standard for surfactin by LC-MS/MS. (A) The UV chromatogram, total ion flow diagram for negative ion mode (ES-) and positive ion mode (ES+) of commercial surfactin standard. (B) The UV chromatogram, total ion flow diagram for ES- and ES+ of lipopeptide crude extracts from B. subtilis 9407. (C,E,G,I) The mass spectrums of surfactin standard with ES- and ES+. (D,F,H,J) The mass spectrums of lipopeptide crude extracts from B. subtilis 9407 with ES- and ES+.