Feasibility of ethanol production from coffee husks

The objective of this work was to evaluate the feasibility of ethanol production by fermentation of coffee husks by Saccharomyces cerevisiae. Batch fermentation studies were performed employing whole and ground coffee husks, and aqueous extract from ground coffee husks. It was observed that fermenta...

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Bibliographic Details
Published in:Biotechnology letters 2009-09, Vol.31 (9), p.1315-1319
Main Authors: Gouvea, B. M, Torres, C, Franca, A. S, Oliveira, L. S, Oliveira, E. S
Format: Article
Language:English
Subjects:
Applied Microbiology
Barley straw
Biochemistry
Biological and medical sciences
Biomedical and Life Sciences
Biotechnology
Coffee
Coffee - metabolism
Ethanol
Ethanol - metabolism
Fermentation
Fundamental and applied biological sciences. Psychology
Hordeum vulgare
Life Sciences
Methods. Procedures. Technologies
Microbial engineering. Fermentation and microbial culture technology
Microbiology
Original Research Paper
Saccharomyces cerevisiae
Saccharomyces cerevisiae - growth & development
Saccharomyces cerevisiae - metabolism
Temperature
Triticum aestivum
Wheat
Yeast
Yeasts
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Summary:The objective of this work was to evaluate the feasibility of ethanol production by fermentation of coffee husks by Saccharomyces cerevisiae. Batch fermentation studies were performed employing whole and ground coffee husks, and aqueous extract from ground coffee husks. It was observed that fermentation yield decreased with an increase in yeast concentration. The best results were obtained for the following conditions: whole coffee husks, 3 g yeast/l substrate, temperature of 30°C. Under these conditions ethanol production was 8.49 ± 0.29 g/100 g dry basis (13.6 ± 0.5 g ethanol/l), a satisfactory value in comparison to literature data for other residues such as corn stalks, barley straw and hydrolyzed wheat stillage (5-11 g ethanol/l). Such results indicate that coffee husks present excellent potential for residue-based ethanol production.
ISSN:0141-5492
1573-6776
DOI:10.1007/s10529-009-0023-4