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Bioethanol

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Ethanol production from brown seaweed using non-conventional yeasts

Oluwatosin Obata
  • Corresponding author
  • Scottish Association for Marine Science, Scottish Marine Institute, Oban, PA37 1QA, Scotland, UK
  • Other articles by this author:
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/ Joseph Akunna
  • Corresponding author
  • School of Science, Engineering & Technology, Abertay University, Bell Street, Dundee DD1 1HG, Scotland, UK
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Heike Bockhorn
  • Corresponding author
  • DuPont Nutrition & Health, Danisco Deutschland GmbH, Busch-Johannsen-Str. 1, D – 25899, Niebüll, Germany
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  • De Gruyter OnlineGoogle Scholar
/ Graeme Walker
  • Corresponding author
  • School of Science, Engineering & Technology, Abertay University, Bell Street, Dundee DD1 1HG, Scotland, UK
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2016-06-29 | DOI: https://doi.org/10.1515/bioeth-2016-0010

Abstract

The use of macroalgae (seaweed) as a potential source of biofuels has attracted considerable worldwide interest. Since brown algae, especially the giant kelp, grow very rapidly and contain considerable amounts of polysaccharides, coupled with low lignin content, they represent attractive candidates for bioconversion to ethanol through yeast fermentation processes. In the current study, powdered dried seaweeds (Ascophylum nodosum and Laminaria digitata) were pre-treated with dilute sulphuric acid and hydrolysed with commercially available enzymes to liberate fermentable sugars. Higher sugar concentrations were obtained from L. digitata compared with A. nodosum with glucose and rhamnose being the predominant sugars, respectively, liberated from these seaweeds. Fermentation of the resultant seaweed sugars was performed using two non-conventional yeast strains: Scheffersomyces (Pichia) stipitis and Kluyveromyces marxianus based on their abilities to utilise a wide range of sugars. Although the yields of ethanol were quite low (at around 6 g/L), macroalgal ethanol production was slightly higher using K. marxianus compared with S. stipitis. The results obtained demonstrate the feasibility of obtaining ethanol from brown algae using relatively straightforward bioprocess technology, together with non-conventional yeasts. Conversion efficiency of these non-conventional yeasts could be maximised by operating the fermentation process based on the physiological requirements of the yeasts.

Keywords: Fermentation; non-conventional yeasts; Ascophylum nodosum; Laminaria digitata

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About the article

Received: 2015-08-14

Accepted: 2016-01-22

Published Online: 2016-06-29


Citation Information: Bioethanol, Volume 2, Issue 1, Pages 134–145, ISSN (Online) 2299-6788, DOI: https://doi.org/10.1515/bioeth-2016-0010.

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© 2016 Oluwatosin Obata et al.. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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