Fermentable sugars recovery from grape stalks for bioethanol production

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• 作者：I. Eg¨¹¨¦s ; L. Serrano ; D. Amendola ; D.M. De Faveri ; G. Spigno ; J. Labidi
• 关键词：Grape stalks ; Hydrolysis ; Sugars ; Purification ; Fermentation ; Ethanol
• 刊名：Renewable Energy
• 出版年：2013
• 出版时间：December, 2013
• 年：2013
• 卷：60
• 期：Complete
• 页码：553-558
• 全文大小：511 K

文摘

Three different processes were investigated for the recovery of fermentable sugars from grape stalks: autohydrolysis at 121?¡ãC before and after a pre-washing step and acid hydrolysis (2 % H₂SO₄ w/w) after a pre-washing step. Moreover, optimal conditions of a charcoal-based purification process were determined by experimental design. All hydrolysates, with their corresponding synthetic liquors were used as fermentation substrates for the production of metabolites by the yeast: Debaryomyces nepalensis NCYC 1026. The main fermentation product was ethanol, where a maximum production of 20.84?g/l, a conversion yield of 0.35?g ethanol/g monomeric sugars and a productivity of 0.453?g/l?h were obtained from non-purified autohydrolysate liquor. In all cases, ethanol production and cell growth were better in non-purified liquors than in synthetic liquors. These results could be influenced by the presence of other sugars in the hydrolysates, with higher concentration in non-purified ones.