Energies 2013, 6(8), 3937-3950; doi:10.3390/en6083937

Bioethanol Production by Carbohydrate-Enriched Biomass of Arthrospira (Spirulina) platensis

1 Department of Natural Resources Management and Agricultural Engineering, Agricultural University of Athens, Iera Odos 75, Athens 11855, Greece 2 Department of Environmental Engineering, Building 113, Technical University of Denmark, Lyngby 2800, Denmark 3 Biotechnology and Industrial Fermentations Lab, Faculty of Food Science and Nutrition, Technological Educational Institution of Athens, Ag. Spyridon Street, Egaleo 12210, Athens, Greece
* Author to whom correspondence should be addressed.
Received: 19 June 2013; in revised form: 7 July 2013 / Accepted: 23 July 2013 / Published: 6 August 2013
(This article belongs to the Special Issue Algae Fuel 2013)
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Abstract: In the present study the potential of bioethanol production using carbohydrate-enriched biomass of the cyanobacterium Arthrospira platensis was studied. For the saccharification of the carbohydrate-enriched biomass, four acids (H2SO4, HNO3, HCl and H3PO4) were investigated. Each acid were used at four concentrations, 2.5 N, 1 N, 0.5 N and 0.25 N, and for each acid concentration the saccharification was conducted under four temperatures (40 °C, 60 °C, 80 °C and 100 °C). Higher acid concentrations gave in general higher reducing sugars (RS) yields (%, gRS/gTotal sugars) with higher rates, while the increase in temperature lead to higher rates at lower acid concentration. The hydrolysates then were used as substrate for ethanolic fermentation by a salt stress-adapted Saccharomyces cerevisiae strain. The bioethanol yield (%, gEtOH/gBiomass) was significantly affected by the acid concentration used for the saccharification of the carbohydrates. The highest bioethanol yields of 16.32% ± 0.90% (gEtOH/gBiomass) and 16.27% ± 0.97% (gEtOH/gBiomass) were obtained in hydrolysates produced with HNO3 0.5 N and H2SO4 0.5 N, respectively.
Keywords: Arthrospira (Spirulina); bioethanol; fermentation; microalgae; pretreatment; acid hydrolysis; thermal hydrolysis

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MDPI and ACS Style

Markou, G.; Angelidaki, I.; Nerantzis, E.; Georgakakis, D. Bioethanol Production by Carbohydrate-Enriched Biomass of Arthrospira (Spirulina) platensis. Energies 2013, 6, 3937-3950.

AMA Style

Markou G, Angelidaki I, Nerantzis E, Georgakakis D. Bioethanol Production by Carbohydrate-Enriched Biomass of Arthrospira (Spirulina) platensis. Energies. 2013; 6(8):3937-3950.

Chicago/Turabian Style

Markou, Giorgos; Angelidaki, Irini; Nerantzis, Elias; Georgakakis, Dimitris. 2013. "Bioethanol Production by Carbohydrate-Enriched Biomass of Arthrospira (Spirulina) platensis." Energies 6, no. 8: 3937-3950.

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