Production of bioethanol from fermented sugars of sugarcane bagasse produced by lignocellulolytic enzymes of Exiguobacterium sp. VSG-1

Appl Biochem Biotechnol. 2013 Sep;171(1):246-60. doi: 10.1007/s12010-013-0366-0. Epub 2013 Jul 6.

Abstract

Exiguobacterium sp. VSG-1 was isolated from the soil sample and characterized for the production of lignocellulolytic enzymes. Production of these enzymes by the strain VSG-1 was carried out using steam-exploded sugarcane bagasse (SCB) and found to secrete cellulase, pectinase, mannanase, xylanase, and tannase. The growth and enzyme production were found to be optimum at pH 9.0 and 37 °C. Upon steam explosion of SCB, the cellulose increased by 42 %, whereas hemicelluloses and lignin decreased by 40 and 62 %, respectively. Enzymatic hydrolysis of steam-exploded SCB yielded 640 g/l of total sugars. Fermentation of sugars produced from pretreated SCB was carried out by using Saccharomyces cerevisiae at pH 5.0 and 30 °C. The alcohol produced was calculated and found to be 62.24 g/l corresponding to 78 % of the theoretical yield of ethanol. Hence, the strain VSG-1 has an industrial importance for the production of fermentable sugars for biofuels.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bacillales / drug effects
  • Bacillales / enzymology*
  • Bacillales / growth & development
  • Bacillales / metabolism
  • Biofuels / microbiology*
  • Cellulose / metabolism*
  • Dose-Response Relationship, Drug
  • Ethanol / metabolism*
  • Fermentation*
  • Glucose / metabolism
  • Hydrogen-Ion Concentration
  • Lignin / metabolism*
  • Saccharomyces cerevisiae / metabolism
  • Saccharum / chemistry*
  • Sodium Chloride / pharmacology
  • Temperature

Substances

  • Biofuels
  • lignocellulose
  • Ethanol
  • Sodium Chloride
  • Cellulose
  • Lignin
  • bagasse
  • Glucose