초록
<P><B>Abstract</B></P> <P>Potato peel from a snack factory was assessed as possible feedstock for biobutanol production. This lignocellulosic biomass was subjected to various physicochemical pretreatments (autohydrolysis and hydrolysis with dilute acids, alkalis, organic solvents or surfactants) under different conditions of time, temperature and reagent concentrations, in order to favour the release of sugars and reduce the generation of fermentation inhibitors. Thereafter, the pretreated potato peel was treated enzymatically to complete the hydrolysis. Autohydrolysis at 140 °C and 56 min was the most effective pretreatment, releasing 37.9 ± 2.99 g/L sugars from an aqueous mixture containing 10% (w/w) potato peel (sugar recovery efficiency 55 ± 13%). The fermentability of the hydrolysates was checked with six strains of <I>Clostridium beijerinckii</I>, <I>C. acetobutylicum</I>, <I>C. saccharobutylicum</I> and <I>C. saccaroperbutylacetonicum</I>. <I>C. saccharobutylicum</I> DSM 13864 produced 2.1 g/L acetone, 7.6 g/L butanol and 0.6 g/L ethanol in 96 h (0.186 g<SUB>B</SUB>/g<SUB>S</SUB>), whereas <I>C. saccharoperbutylacetonicum</I> DSM 2152 generated 1.8 g/L acetone, 8.1 g/L butanol and 1.0 g/L ethanol in 120 h (0.203 g<SUB>B</SUB>/g<SUB>S</SUB>). Detoxification steps of the hydrolysate before fermentation were not necessary. Potato peel may be an interesting feedstock for biorefineries focused on butanol production.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Potato peel from a snack factory was successfully used for biobutanol production. </LI> <LI> This lignocellulosic waste was treated by autohydrolysis and enzymatic hydrolysis. </LI> <LI> A broth with about 40 g/L sugars and low inhibitor concentrations was obtained. </LI> <LI> Butanol production from this broth depended on the <I>Clostridium</I> strain used. </LI> <LI> The most efficient strain generated 2 g/L acetone, 8 g/L butanol and 1 g/L ethanol. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>