α-bisabolol structure and solubilization in the culture medium. (A) α-bisabolol is a small oily sesquiterpene alcohol with a molecular mass of 222.37 Da. (B) 250 μM α-bisabolol was added to culture medium: concentration raised during the first 3 hours, then lowered to around 65% of the initially added α-bisabolol after 24 hours. (C) By this time, the linear function relating added to measured concentrations of α-bisabolol shows that the incremental ratio was 0.65 for 14 evaluations representing a double series of 7 scaled concentrations tested by a RP-HPLC method. Each point is the mean ± SD of 2 measurements.