Fermentable sugars recovery from grape stalks for bioethanol production

Giorgia Spigno, Danila Amendola, Dante Marco De Faveri, I. Egüés, L. Serrano, J. Labidi

Risultato della ricerca: Contributo in rivistaArticolo in rivistapeer review

20 Citazioni (Scopus)

Abstract

Three different processes were investigated for the recovery of fermentable sugars from grape stalks: autohydrolysis at 121°C before and after a pre-washing step and acid hydrolysis (2% H2SO4w/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 20.84g/l, a conversion yield of 0.35g ethanol/g monomeric sugars and a productivity of 0.453g/lh 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.
Lingua originaleEnglish
pagine (da-a)553-558
Numero di pagine6
RivistaRenewable Energy
Volume60
DOI
Stato di pubblicazionePubblicato - 2013

Keywords

  • Ethanol
  • Fermentation
  • Grape stalks
  • Hydrolysis
  • Purification
  • Sugars

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