Open AccessValorization of andiroba (Carapa guianensis Aubl.) residues through optimization of alkaline pretreatment to obtain fermentable sugars
Author(s) -
Leiliane do Socorro Sodré de Souza,
Anderson Mathias Pereira,
Marco Antônio dos Santos Farias,
Rafael Lopes e Oliveira,
Sérgio Duvoisin,
João Nazareno ato Quaresma
Publication year - 2019
Publication title -
bioresources
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 69
ISSN - 1930-2126
DOI - 10.15376/biores.15.1.894-909
Subject(s) - hemicellulose , cellulose , response surface methodology , lignin , hydrolysis , box–behnken design , sugar , reducing sugar , pulp and paper industry , chemistry , raw material , nuclear chemistry , chromatography , food science , organic chemistry , engineering
The residual peels of andiroba seeds were submitted to alkaline pretreatment that aimed to maximize the recovery of fermented sugar. Evaluation of the best operation performance via the reaction time variables (20, 60, and 100 min), NaOH concentration (2, 3, and 4% (m/v)), and temperature (60, 90, and 120 °C) at a fixed solids concentration of 5% (m/v) was performed. A Box-Behnken experimental design was used. Lignocellulosic material was characterized by cellulose (30.57 ± 1.00%), hemicellulose (15.08 ± 0.65%), lignin (36.02 ± 1.05%), extractives (7.49 ± 0.03%), and ash (1.53 ± 0.28%). The optimization was performed using the response surface methodology approach. The model provided a coefficient of determination (R2) of 0.95. The predicted optimal conditions for the process were a reaction time of 100 min, NaOH concentration of 4% (m/v), and temperature of 120 °C, which allowed the authors to obtain a saccharification of approximately 47.9%.