Optimization of integrated alkaline–extrusion pretreatment of barley straw for sugar production by enzymatic hydrolysis |
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Authors: | A Duque P Manzanares I Ballesteros MJ Negro JM Oliva F Saez M Ballesteros |
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Institution: | Biofuels Unit, Energy Department-CIEMAT, Avda. Complutense, 22, 28040 Madrid, Spain |
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Abstract: | In this work, an integrated one-step alkaline–extrusion process was tested as pretreatment for sugar production from barley straw (BS) biomass. The influence of extrusion temperature (T) and the ratio NaOH/BS dry matter (w/w) (R) into the extruder on pretreatment effectiveness was investigated in a twin-screw extruder at bench scale. A 23 factorial design of experiments was used to analyze the effect of process conditions T: 50–100 °C; R: 2.5–7.5% (w/w)] on composition and enzymatic digestibility of pretreated substrate (extrudate). The optimum conditions for a maximum glucan to glucose conversion were determined to be R = 6% and T = 68 °C. At these conditions, glucan yield reached close to 90% of theoretical, while xylan conversion was 71% of theoretical. These values are 5 and 9 times higher than that of the untreated material, which supports the great potential of this one-step combined pre-treatment technology for sugar production from lignocellulosic substrates. The absence of sugar degradation products is a relevant advantage over other traditional methods for a biomass to ethanol production process since inhibitory effect of such product on sugar fermentation would be prevented. |
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Keywords: | Lignocellulose Experimental design Extrusion Enzymatic hydrolysis Alkaline treatment |
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