کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
681740 | 888961 | 2011 | 8 صفحه PDF | دانلود رایگان |
The production of fermentable substrates from barley straw under various process conditions was studied. Pretreatment included chemical pretreatment with dilute-acid followed by enzymatic hydrolysis; the pretreatment conditions were expressed in a combined severity factor, CS, which ranged in the present study from −1.6 to 1.1. Considering the production of fermentable sugars and the release of inhibitory compounds, the optimal pretreatment conditions were 170 °C, 0% sulfuric acid and 60 min, corresponding to CS −0.4. Under these conditions, 21.4 g glucose/L, 8.5 g xylose/L, and 0.5 g arabinose/L were produced, while 0.1 g HMF/L, 0.4 g furfural/L, 0.0 g levulinic acid/L, 0.0 g formic acid/L, and 2.1 g acetic acid/L were released. The ratio of Σsugars/Σinhibitors proved to be a good tool for evaluating the suitability of a hydrolysate for fermentation purposes.
► We studied dilute-acid pretreatment of barley straw at low combined severity (−1.6 to 1.1).
► We monitored the production of fermentable sugars and the release of five inhibitory compounds.
► We optimized the pretreatment conditions at 170 °C, 0% sulfuric acid and 60 min.
► We used the ratio of Σsugars/Σinhibitors to evaluate the suitability of barley straw hydrolysates for fermentation purposes.
► We discussed the effect of the concentrations of the inhibitors on ethanol and hydrogen fermentability.
Journal: Bioresource Technology - Volume 102, Issue 24, December 2011, Pages 11204–11211