Cardoon Hydrolysate Detoxification by Activated Carbon or Membranes System for Bioethanol Production


Advanced biofuels incorporation into the transportation sector, particularly cellulosic bioethanol, is crucial for attaining carbon neutrality by 2050, contributing to climate changes mitigation and wastes minimization. The world needs biofuel to be commercially available to tackle the socioeconomic challenges coming from the continued use of fossil fuels. Cynara cardunculus (cardoon) is a cheap lignocellulosic raw biomass that easily grows in Mediterraneous soils and is a potential renewable resource for a biorefinery. This work aimed to study the bioethanol production from cardoon hemicellulosic hydrolysates, which originated from dilute sulfuric acid hydrolysis pretreatment. A detoxification step to remove released microbial fermentative inhibitors was evaluated by using both activated carbon adsorption and a nanofiltration membrane system. The Scheffersomyces stipitis CBS5773 yeast and the modified Escherichia coli MS04 fermentation performances at different experimental conditions were compared. The promising results with E. coli, using detoxified cardoon by membrane nanofiltration, led to a bioethanol volumetric productivity of 0.30 g center dot L-1 center dot h(-1), with a conversion efficiency of 94.5%. Regarding the S. stipitis, in similar fermentation conditions, volumetric productivity of 0.091 g center dot L-1 center dot h(-1) with a conversion efficiency of 64.9% was obtained. Concluding, the production of bioethanol through detoxification of hemicellulosic cardoon hydrolysate presents a suitable alternative for the production of second-generation bioethanol, especially using the modified E. coli.



subject category

Energy & Fuels


Tavares, APM; Goncalves, MJA; Bras, T; Pesce, GR; Xavier, AMRB; Fernandes, MC

our authors


This work was carried out under the Project BioEcos-Valorizacao Integrada de Biomassa, Project ALENT-09-0140-FEDER-000705, funded by INALENTEJO 2010-2014 through European Regional Development Fund (ERDF); and within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020, UIDP/50011/2020 and LA/P/0006/2020, financed by national funds through the FCT/MEC (PIDDAC) and MED-Mediterranean Institute for Agriculture, Environment and Development; and UIDB/05183/2020, financed by national funds through the Portuguese Foundation for Science and Technology/MCTES.

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