The organosolv fractionation of cork components
Autor(a) principal: | |
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Data de Publicação: | 2002 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.13/3366 |
Resumo: | Extractive-free cork from Quercus suber L. was submitted to organosolv fractionation and the effects of different process variables, such as ethanol/water ratio, temperature, time and the presence of acidic or alkaline catalysts, were studied. The variation of the relative proportions of extracted components, as a function of the processing conditions, could thus be established. Whereas the addition of 0.1 M acetic acid only increased the yield of extracted materials from about 15 to 23%, the use of sodium hydroxide, at the same concentration, produced a jump to 76%. In the case of the alkaline organosolv fractiona tion, an increase in process temperature, time and catalyst concentration led to an increase in the extraction yield, although in some cases this increase did not follow a sustained trend, as in the case of reaction time. Increasing the ethanol/water ratio led to a higher selectivity in favour of suberin extraction. Residual cork from different organosolv processes was characterised by FTIR and 13C solid-state NMR. The latter technique provided some valuable information about both process selectivity and cork morphology, particularly with respect to the positioning of suberin macromolecules in the cell wall. |
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The organosolv fractionation of cork componentsCorkQuercus suber L.Organosolv fractionationEthanol/water extractionSuberinFTIR13C NMR.Faculdade de Ciências Exatas e da EngenhariaExtractive-free cork from Quercus suber L. was submitted to organosolv fractionation and the effects of different process variables, such as ethanol/water ratio, temperature, time and the presence of acidic or alkaline catalysts, were studied. The variation of the relative proportions of extracted components, as a function of the processing conditions, could thus be established. Whereas the addition of 0.1 M acetic acid only increased the yield of extracted materials from about 15 to 23%, the use of sodium hydroxide, at the same concentration, produced a jump to 76%. In the case of the alkaline organosolv fractiona tion, an increase in process temperature, time and catalyst concentration led to an increase in the extraction yield, although in some cases this increase did not follow a sustained trend, as in the case of reaction time. Increasing the ethanol/water ratio led to a higher selectivity in favour of suberin extraction. Residual cork from different organosolv processes was characterised by FTIR and 13C solid-state NMR. The latter technique provided some valuable information about both process selectivity and cork morphology, particularly with respect to the positioning of suberin macromolecules in the cell wall.De GruyterDigitUMaCordeiro, NereidNeto, Carlos PascoalRocha, JoaoBelgacem, Mohamed N.Gandini, Alessandro2021-05-05T13:16:31Z2002-01-01T00:00:00Z2002-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.13/3366engCordeiro, N., Neto, C. P., Rocha, J., Belgacem, M. N., & Gandini, A. (2002). The organosolv fractionation of cork components. Holzforschung, 56(2), 135-142.10.1515/HF.2002.023info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2022-09-05T12:56:19Zoai:digituma.uma.pt:10400.13/3366Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T15:06:25.125254Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
The organosolv fractionation of cork components |
title |
The organosolv fractionation of cork components |
spellingShingle |
The organosolv fractionation of cork components Cordeiro, Nereid Cork Quercus suber L. Organosolv fractionation Ethanol/water extraction Suberin FTIR 13C NMR . Faculdade de Ciências Exatas e da Engenharia |
title_short |
The organosolv fractionation of cork components |
title_full |
The organosolv fractionation of cork components |
title_fullStr |
The organosolv fractionation of cork components |
title_full_unstemmed |
The organosolv fractionation of cork components |
title_sort |
The organosolv fractionation of cork components |
author |
Cordeiro, Nereid |
author_facet |
Cordeiro, Nereid Neto, Carlos Pascoal Rocha, Joao Belgacem, Mohamed N. Gandini, Alessandro |
author_role |
author |
author2 |
Neto, Carlos Pascoal Rocha, Joao Belgacem, Mohamed N. Gandini, Alessandro |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
DigitUMa |
dc.contributor.author.fl_str_mv |
Cordeiro, Nereid Neto, Carlos Pascoal Rocha, Joao Belgacem, Mohamed N. Gandini, Alessandro |
dc.subject.por.fl_str_mv |
Cork Quercus suber L. Organosolv fractionation Ethanol/water extraction Suberin FTIR 13C NMR . Faculdade de Ciências Exatas e da Engenharia |
topic |
Cork Quercus suber L. Organosolv fractionation Ethanol/water extraction Suberin FTIR 13C NMR . Faculdade de Ciências Exatas e da Engenharia |
description |
Extractive-free cork from Quercus suber L. was submitted to organosolv fractionation and the effects of different process variables, such as ethanol/water ratio, temperature, time and the presence of acidic or alkaline catalysts, were studied. The variation of the relative proportions of extracted components, as a function of the processing conditions, could thus be established. Whereas the addition of 0.1 M acetic acid only increased the yield of extracted materials from about 15 to 23%, the use of sodium hydroxide, at the same concentration, produced a jump to 76%. In the case of the alkaline organosolv fractiona tion, an increase in process temperature, time and catalyst concentration led to an increase in the extraction yield, although in some cases this increase did not follow a sustained trend, as in the case of reaction time. Increasing the ethanol/water ratio led to a higher selectivity in favour of suberin extraction. Residual cork from different organosolv processes was characterised by FTIR and 13C solid-state NMR. The latter technique provided some valuable information about both process selectivity and cork morphology, particularly with respect to the positioning of suberin macromolecules in the cell wall. |
publishDate |
2002 |
dc.date.none.fl_str_mv |
2002-01-01T00:00:00Z 2002-01-01T00:00:00Z 2021-05-05T13:16:31Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.13/3366 |
url |
http://hdl.handle.net/10400.13/3366 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Cordeiro, N., Neto, C. P., Rocha, J., Belgacem, M. N., & Gandini, A. (2002). The organosolv fractionation of cork components. Holzforschung, 56(2), 135-142. 10.1515/HF.2002.023 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
De Gruyter |
publisher.none.fl_str_mv |
De Gruyter |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799129934602436608 |