Fig. 3From: Direct IBE fermentation from mandarin orange wastes by combination of Clostridium cellulovorans and Clostridium beijerinckiiConcentration of alcohol (a) and residual glucose ratio (b) in the culture medium with C. beijerinckii, where different concentrations of limonene (v/v), 0% (filled circle), 0.01% (×), 0.02% (open triangle), 0.05% (open square), and 0.1% (open circle), was present in the culture medium. c Alcohol production at 72-h cultivation. Values are mean ± SE of three independent samples. An asterisk indicates a significant difference (p < 0.05)Back to article page