Fig. 3
Microbial growth (circle, represented as the optical density at 600 nm), glucose consumption (triangle), and butyric acid production (square) without extraction (a), and with CO2-pressurized (50 bar) extraction (b, c). The arrow indicates the toxicity of butyl butyrate remaining in the aqueous phase (b). After the removal of residual butyl butyrate using tetradecane, both glucose consumption rate and butyric acid productivity increased (c)