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Evaluation of the alcoholic fermentation kinetics of enzymatic hydrolysates from sugarcane bagasse ( Saccharum officinarum L.)
Author(s) -
Ramos de Andrade Rafael,
Cândida Rabelo Sarita,
Maugeri Filho Francisco,
Maciel Filho Rubens,
Carvalho da Costa Aline
Publication year - 2013
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.3937
Subject(s) - bagasse , hydrolysate , fermentation , ethanol fuel , chemistry , ethanol fermentation , biofuel , food science , kinetics , acetic acid , ethanol , saccharum officinarum , biomass (ecology) , lignocellulosic biomass , pulp and paper industry , biochemistry , microbiology and biotechnology , hydrolysis , botany , agronomy , biology , physics , quantum mechanics , engineering
Background The efficient production of bioethanol by Saccharomyces cerevisiae using lignocellulosic biomass as raw material depends on the fermentability of the hydrolysates. In this work the evaluation of the kinetics of ethanol production by S. cerevisiae using enzymatic hydrolysates was performed and compared with the kinetics of diluted sugarcane molasses fermentation.Results A term for inhibition by acetic acid was added to a previous model, the kinetic parameters were re‐estimated and the model has been shown to describe accurately new experiments with distinct hydrolysates proportions as fermentative media. Among all the kinetic parameters, a great reduction in μ max (from 0.437 to 0.37 h −1 , at 34°C ), and increment in Y px (from 9.89 to 16.63 kg kg −1 , at 34°C ) were noted, which strongly affected the kinetics of fermentation.Conclusions The kinetic parameters obtained for hydrolysates differed very significantly from those obtained using molasses, which shows that models developed to describe the kinetics of first generation ethanol production need to be reformulated and adapted to describe the kinetics of second generation ethanol fermentation. The productivities achieved were between 1 and 3 kg m ‐3 h −1 , which are considered acceptable for alcoholic fermentations in batch mode, showing the good fermentability of hydrolysates even without detoxification. © 2012 Society of Chemical Industry