resumo
Bioethanol production potential from cardoon (Cynara cardunculus) and rockrose (Cistus ladanifer), pretreated by diluted acid hydrolysis (DAH), was studied and compared by both, separate enzymatic hydrolysis and fermentation (SHF) and simultaneous saccharification and fermentation (SSF) processes. DAH pretreatment allowed an increase of 5 fold to cardoon and 16 fold to rockrose in cellulose accessibility towards enzymatic hydrolysis. Both plants showed better overall fermentation efficiency and ethanol yield in SSF than in SHF also with shorter processing periods, 24 h against 72 + 24 h, respectively. Results obtained for rockrose are about half the concentration and volumetric productivity of ethanol and 60% of the overall fermentation efficiency of those obtained for cardoon. The recalcitrance of rockrose to enzymatic hydrolysis was explained by higher abundance of lignin and extractives than in cardoon. Comparing the steam explosion (SE) and DAH pretreatments, the former was more advantageous for the recalcitrant rockrose in terms of enzymatic saccharification yield.
palavras-chave
CYNARA-CARDUNCULUS; ETHANOL-PRODUCTION; STEAM-EXPLOSION; ENZYMATIC SACCHARIFICATION; CISTUS-LADANIFER; BIOMASS
categoria
Agriculture
autores
Fernandes, MC; Ferro, MD; Paulino, AFC; Chaves, HT; Evtuguin, DV; Xavier, AMRB
nossos autores
Ana Maria Rebelo Barreto Xavier
Professor Auxiliar
Dmitry Evtyugin
Professor Associado com Agregação
Maria da Conceição Fernandes
Bolseiro de pós-Doutoramentoagradecimentos
This research was funded by INALENTEJO 2007.2013/QREN (BioEcos Project - Valorizacao Integrada de Biomassa (ALENT-09-0140-FEDER-000705 (QREN)). The author's thanks, FCT (Fundacao para a Ciencia e Tecnologia) under projects CICECO-Aveiro Institute of Materials (Ref.FCTUID/CTM/50011/2013) and ICAAM-Instituto de Ciencias Agrarias e Ambientais Mediterranicas (Ref.FCTUID/AGR/00115/2013). Agrarian School from Instituto Politecnico de Beja and Associagao de Defesa do Patrimemio de Mertola, are greatly acknowledged for kindly supplying cardoon and rockrose, respectively.