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. 2017 Feb 9;8:193. doi: 10.3389/fmicb.2017.00193

FIGURE 4.

FIGURE 4

Mass spectrum of the biosurfactant isolated from B. subtilis A1. (A) Hexadecanoic acid, methyl ester; (B) 9, 12- octadecadienoic acid (Z,Z)-, methyl ester; (C) 9-octadecenoic acid, 12-hydroxy-, methyl ester.