Fig. 4From: Purification and identification of a surfactin biosurfactant and engine oil degradation by Bacillus velezensis KLP2016HPLC chromatogram of purified biosurfactant and biosurfactant standards. a standard of iturin A; b standard of surfactin; c chromatogram of active Sephadex G-25 fraction. The purified biosurfactant might be a surfactin showing ~ similar retention time tothat of surfactinBack to article page