Fig. 3From: Purification and identification of a surfactin biosurfactant and engine oil degradation by Bacillus velezensis KLP2016a Standard of Iturin A; b standard of surfactin; c UV visible spectra showing absorbance maxima of biosurfactant containing purified fractions of B. velezensis KLP2016at 221 and 210Â nm; d Spot(s) of the cell-free broth sample and standard onTLC plate, (a) iturin, (b) surfactin, (c, d) Purified biosurfactant from BacillusvelezensisKLP2016Back to article page