CIEMAT

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https://emimasd.consorciomadrono.es/handle/11034/35

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Organizando CIEMAT por Autor "Manzanares, Paloma"

Mostrando1 - 2 de 2
  • Artículo
    Acceso Abierto
    Enzymatic hydrolysis from carbohydrates of barley straw pretreated by ionic liquids
    (2013-12-12) Ballesteros, Mercedes; Saez, Felicia; Ballesteros, Ignacio; Manzanares, Paloma; Oliva, Jose Miguel; Negro, Maria José
    Lignocellulosic biomass offers many potential advantages in comparison with the traditionally used sugars or starchy biomass since it’s vastly available and it does not compete with food and feed production. The abundance and high carbohydrates content of barley straw make it a good candidate for bioethanol production in Europe. Since biomass must be pretreated before enzymatic hydrolysis to improve the digestibility of both the cellulose and the hemicellulose biomass, the use of ionic liquids (IL) has been proposed as an environmental friendly pretreatment of biomass.Different pretreatment conditions were investigated to determine the effects of the experimental conditions (temperature and time) on the enzymatic digestibility of pretreated material. The pretreatment of barley straw with 1-ethyl-3-methyl imidazolium acetate treatment resulted in up to a 9-fold increase in the cellulose conversion and a 13- 22 fold increase in the xylan conversion when compared with the untreated barley straw.Ionic liquid pretreatment of barley straw at 110 ºC for 30 minutes, 24 followed by enzymatic hydrolysis, leads to a sugar yield of 53.5 g/100 g raw material. 25 It’s then ready available for conversion into ethanol and is equivalent to more than 86%from potential sugars. The increase in saccharification was possible due to the rupture in lignin-hemicellulose linkages with treatment of 1-ethyl-3-methyl imidazolium acetate
  • Artículo
    Acceso Abierto
    OPTIMIZATION OF INTEGRATED ALKALINE-EXTRUSION PRETREATMENT OF BARLEY STRAW FOR SUGAR PRODUCTION BY ENZYMATIC HYDROLYSIS
    (2013-12-12) Duque, Aleta; Manzanares, Paloma; Ballesteros, Ignacio; Negro, Maria José; Oliva, Jose Miguel; Saez, Felicia; Ballesteros, Mercedes
    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 10 temperature (T) and the ratio NaOH/BS dry matter (w/w) into the extruder on pretreatment effectiveness was investigated in a twin-screw extruder at bench scale . A 23 factorial response surface design of experiments was used to analyze the effect of process conditions [T: 50- 100ºC; NaOH/BS ratio: 2.5-7.5% (w/w)] on composition and enzymatic digestibility of pretreated substrate. The optimization of these process variables for a maximum glucan to 15 glucose conversion was determined to be at 6% NaOH/DM and 68ºC. 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