title: Feasibility of ethanol production from coffee husks.
abstract: 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 degrees 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.
authors.affiliation: DEQ/UFMG, R. Espirito Santo 35-6 degrees andar, Belo Horizonte, MG 30160-030, Brazil.
authors.forename: B M
authors.initials: BM
authors.lastname: Gouvea
authors.forename: C
authors.initials: C
authors.lastname: Torres
authors.forename: A S
authors.initials: AS
authors.lastname: Franca
authors.forename: L S
authors.initials: LS
authors.lastname: Oliveira
authors.forename: E S
authors.initials: ES
authors.lastname: Oliveira
mesh_terms: D003069:Coffee / Q000378:metabolism*; D000431:Ethanol / Q000378:metabolism*; D005285:Fermentation; D012441:Saccharomyces cerevisiae / Q000254:growth & development / Q000378:metabolism*; D013696:Temperature
chemical_list: D003069:Coffee; D000431:Ethanol