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. 2020 Aug 24;11:2048. doi: 10.3389/fmicb.2020.02048

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Copyright © 2020 Wambui, Cernela, Corti and Stephan.

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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Biosurfactant activity of C. gasigenes CGAS001’s crude polyketide extract. Addition of the crude extract to distilled water (20 μg/ml) affected the surface tension of the water. Distilled water without the extract was used as a control. Samples were left to stand in atmospheric air for 30 min at room temperature. Crystal violet was added to the mixture for visual effect and had no influence on the surface tension of the distilled water. (A) Front view and (B) top view of 25 μl droplets of distilled water with (H₂O + PK) or without (H₂O) the extract on a non-polar surface (parafilm) after 30 min. (C) Five hundred microliter of distilled water with (H₂O + PK) or without (H₂O + PK) the polyketide extract in 1 ml cuvettes after 30 min.