초록
<P><B>Abstract</B></P> <P>The production of cellulosic ethanol was carried out using samples of native (NCB) and ethanol-extracted (EECB) sugarcane bagasse. Autohydrolysis (AH) exhibited the best glucose recovery from both samples, compared to the use of both H<SUB>3</SUB>PO<SUB>4</SUB> and H<SUB>2</SUB>SO<SUB>4</SUB> catalysis at the same pretreatment time and temperature. All water-insoluble steam-exploded materials (SEB-WI) resulted in high glucose yields by enzymatic hydrolysis. SHF (separate hydrolysis and fermentation) gave ethanol yields higher than those obtained by SSF (simultaneous hydrolysis and fermentation) and pSSF (pre-hydrolysis followed by SSF). For instance, AH gave 25, 18 and 16gL<SUP>−1</SUP> of ethanol by SHF, SSF and pSSF, respectively. However, when the total processing time was taken into account, pSSF provided the best overall ethanol volumetric productivity of 0.58gL<SUP>−1</SUP> h<SUP>−1</SUP>. Also, the removal of ethanol-extractable materials from cane bagasse had no influence on the cellulosic ethanol production of SEB-WI, regardless of the fermentation strategy used for conversion.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Cane bagasse with low total extractives content was pretreated by steam explosion. </LI> <LI> Autohydrolysis gave glucose yields better than acid-catalyzed steam explosion. </LI> <LI> Extractives removal had little influence on cellulosic ethanol production. </LI> <LI> Substrate hydrolysates were readily fermentable by <I>Saccharomyces cerevisiae.</I> </LI> <LI> Pre-hydrolysis followed by SSF gave the highest overall ethanol volumetric yields. </LI> </UL> </P>