One milligram of obtained biosurfactant was combined with 20 mg of potassium bromide and compressed for preparing pellets. The infrared spectra were obtained using FTIR spectroscopy (Shimadzu FT-8400S model, Japan). The spectral scan of the pellet was taken in the wavelength of 4000 cm−1 and 400 cm−1 with a scan speed of 2 mm/s [24 (link)].
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