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. 2021 Jun 16;44(10):2003–2034. doi: 10.1007/s00449-021-02597-5

Fig. 5.

Fig. 5

EI24 test: addition of equal volumes (1:1) of hydrophobic substrates and samples containing biosurfactants in graduated tubes. Subsequently, the mixture is stirred at high speed, being maintained in the absence of disturbance for phase separation and stability of the formed emulsion (a). The emulsification percentage value can be measured according to (b)