Detoxification of hemicellulosic hydrolysates from extracted olive pomace by diananofiltration |
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| Institution: | 1. Centro de Biotecnologia Agrícola e Agro-Alimentar do Baixo Alentejo e Litoral (CEBAL)/Instituto Politécnico de Beja (IPBeja), 7801-908 Beja, Portugal;2. CICECO, University of Aveiro, 3810-193 Aveiro, Portugal;3. Unidade de Bioenergia-LNEG, Ed. K2, Estrada do Paço do Lumiar, 22, 1649-038 Lisboa, Portugal;4. UCASUL, Rua Mira Fernandes, 2, 7801-901 Beja, Portugal;5. REQUIMTE/CQFB, FCT, Universidade Nova de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal;1. Astronomical Observatory, Volgina 7, 11060 Belgrade 38, Serbia;2. Laboratoire d’Étude du Rayonnement et de la Matière en Astrophysique, Observatoire de Paris, UMR CNRS 8112, UPMC, 5 Place Jules Janssen, 92195 Meudon Cedex, France;3. Department of Applied Physics, Technical University-Sofia, 1000 Sofia, Bulgaria;4. Faculty of Mathematics, University of Belgrade, 11000 Belgrade, Serbia;1. Department of Chemistry, Faculty of Science, Karadeniz Technical University, 61080 Trabzon, Turkey;2. Department of Chemical Engineering, Engineering Faculty, Marmara University, Göztepe, 34722 ?stanbul, Turkey;1. College of Mathematics and Econometrics, Hunan University, Changsha, Hunan 410082, PR China;2. Department of Information Technology, Hunan Women''s University, Changsha, Hunan 410004, PR China;1. Chemical Process Engineering, RWTH Aachen University, Forckenbeckstr. 51, 52074 Aachen, Germany;2. DWI - Leibniz Institute for Interactive Materials, Forckenbeckstr. 50, 52074 Aachen, Germany;1. National Kaohsiung University of Applied Sciences, 415 Jiangong Road, Sanmin District, Kaohsiung 80778, Taiwan;2. National Kaohsiung Marine University, 142 Hai-Jhuan Road, Nanzih District, Kaohsiung 81143, Taiwan |
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| Abstract: | Xylitol can be obtained from the pentose-rich hemicellulosic fraction of agricultural residues, such as extracted olive pomace, by fermentation. Dilute acid hydrolysis of lignocellulosic materials, produces the release of potential inhibitory compounds mainly furan derivatives, aliphatic acids, and phenolic compounds. In order to study the potential on the increase of the hydrolysate fermentability, detoxification experiments based on diananofiltration membrane separation processes were made. Two membranes, NF270 and NF90, were firstly evaluated using hydrolysate model solutions under total recirculation mode, to identify the best membrane for the detoxification. NF270 was chosen to be used in the diananofiltration experiment as it showed the lowest rejection for toxic compounds and highest permeate flux. Diananofiltration experiments, for hydrolysate model solutions and hydrolysate liquor, showed that nanofiltration is able to deplete inhibitory compounds and to obtain solutions with higher xylose content. Conversely to non-detoxified hydrolysates, nanofiltration detoxified hydrolysates enabled yeast growth and xylitol production by the yeast Debaryomyces hansenii, clearly pointing out that detoxification is an absolute requirement for extracted olive pomace dilute acid hydrolysate bioconversion. |
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| Keywords: | Nanofiltration Diafiltration Hydrolysate detoxification Fermentation inhibitors Sustainable membrane processing |
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