Details

Autor(en) / Beteiligte

• Duque, A.
• Manzanares, P.
• Ballesteros, I.
• Negro, M.J.
• Oliva, J.M.
• Saez, F.
• Ballesteros, M.

Titel

Optimization of integrated alkaline–extrusion pretreatment of barley straw for sugar production by enzymatic hydrolysis

Ist Teil von

• Process biochemistry (1991), 2013-05, Vol.48 (5-6), p.775-781

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2013

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• •A new integrated alkaline–extrusion pretreatment is studied on barley straw biomass.•Mild alkali and temperature conditions were tested.•Enzymatic digestibility of biomass increased up to 5 times with alkaline–extrusion.•No sugar degradation products were produced during the pretreatment. 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.