alexa Biorefinery of Energy Crop Cardoon(Cynara cardunculus l.)-Hydrolytic Xylose Production as Entry Point to Complex Fractionation Scheme
ISSN: 2157-7048

Journal of Chemical Engineering & Process Technology
Open Access

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Research Article

Biorefinery of Energy Crop Cardoon(Cynara cardunculus l.)-Hydrolytic Xylose Production as Entry Point to Complex Fractionation Scheme

Anatoly A Shatalov* and Helena Pereira
Centro de Estudos Florestais, Universidade Técnica de Lisboa, Instituto Superior de Agronomia, Tapada da Ajuda, 1349-017 Lisboa, Portugal
Corresponding Author : A.A. Shatalov
Centro de Estudos Florestais
Universidade Técnica de Lisboa
Tel: +351 21 3634662
Fax: +351 21 3653338
E-mail: [email protected]
Received September 28, 2011; Accepted November 18, 2011; PublishedNovember 25, 2011
Citation: Shatalov AA, Pereira H (2011) Biorefinery of Energy Crop Cardoon (Cynara cardunculus l.) - Hydrolytic Xylose Production as Entry Point to Complex Fractionation Scheme. J Chem Eng Process Technol 2:118 doi:10.4172/2157-7048.1000118
Copyright: © 2011 Shatalov AA, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Abstract

Response surface methodology (RSM) was employed for statistical modeling and optimization of low temperature dilute sulfuric acid hydrolysis of hemicellulose fraction of energy agro-crop cardoon (Cynara cardunculus L.), as an entry point to complex biorefinery scheme. The 23 central composite rotatable design (CCRD) was used to assess the effect of the principal independent process variables (reaction time, temperature and acid concentration) on efficiency and selectivity of heteroxylan conversion to xylose. The second-order polynomial model was fitted to experimental data to find optimal reaction conditions of xylan-to-xylose hydrolysis by multiple regression analysis. The effect of acid concentration (linear and quadratic) was found as a more significant (p=0.001-0.007) for monomeric xylose recovery in solution. The maximal xylose yield of ca. 86% (18.08 g /100 g biomass) was achieved after cardoon hydrolysis at 138.5ºC in 1.28% sulfuric acid solution for 52 min, vs. 87% predicted by model. The resulting xyloseenriched substrate revealed low concentration of toxic substances (1.04% furfural, 0.33% 5-hydroxymethylfurfural, 2.03% glucose), providing required quality for subsequent xylose (bio)conversion to final products (e.g. to xylitol). The enzymatic saccharification/digestibility of insoluble residue after hemicellulose removal was improved in four times, resulting in cellulose conversion to fermentable glucose by 76% vs. 19% for unhydrolyzed cardoon.

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