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Solid state fermentation of sweet sorghum by
Saccharomyces cerevisiae to bioethanol
production Karamousantas, D., Th. Varzakas
(Technological Educational Institution of
Kalamata Hellas), D. Arapoglou, C. Israilides
(Institute of Technology of Agricultural Products
Hellas)
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BioFuel - Bioethanol
Ethanol is attractive out of the many alternative
energy sources because it can be widely used as
an all around motor fuel.
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• Why Bioethanol?
• Politico-economic impact.
• Surplus value of raw material
• Increase of places of work and rural income
• Holding of rural population
• B. Environmental impact
• Renewable raw material (Biomass)
• Decrease of environmental pollution
• Reducing energy dependence

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National target for Greece according the new
E.U. Directive
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Sweet Sorghum

• Sugar content 9.6 -20.3 per cent of raw whole
  stalks
• High content of soluble sugar and cellulose

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S. cerevisiae
Juice extraction
Acidic Hydrolysis
Whole stalks
Sweet Sorghum Stalks
Ethanol Production
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Moisture, extracted juice as per cent of whole
fresh material and total sugar of juice, of 8
tested sweet sorghum varieties.
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Fermentation parameters of sweet sorghum juice
with S. Cerevisiae var. Bayanus for ethanol
production.
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Fermentation parameters of sweet sorghum stalk
with S. Cerevisiae var. Bayanus for ethanol
production.
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• CONCLUSIONS
• The fermentation of extracted juice and
  hydrolyzed stalk from eight sweet sorghum
  varieties by Saccharomyces cerevisae var. bayanus
  for ethanol production was studied.
• There was great variation in ethanol production
  among different varieties.
• Ethanol production was in high levels in most of
  varieties.
• Whole stalks produced more ethanol than juice.