Characterization of hairs and pappi from Cynara cardunculus capitula and their suitability for paper production
Autor(a) principal: | |
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Data de Publicação: | 2009 |
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/10400.5/8108 |
Resumo: | The capitula of Cynara cardunculus contain hairs and pappi representing 7% of the total plant biomass. These low density biomass components could be mechanically separated without apparent losses using a whole-plant processing prototype. Hairs and pappi are filamentous structures made up of longitudinally aligned fibre cells, without intercellular voids or pitting, with the following dimensions regarding length, width and wall thickness: 1.35mm, 19.8, and 4.8 m for hairs and 1.78mm, 10.4, and 2.9 m for pappi. Chemically hairs and pappi have low content of ash (1.9% and 1.1%, respectively), extractives (5.4% and 6.0%) and lignin (10.6% and 17.8%), and high content of holocellulose (77.5% and 72.8%) and -cellulose (55.2% and 46.8%). Pulps could be produced using a conventional kraft process with high yields and low residual lignin, e.g. 63% at Kappa 7 for hairs and 48% at Kappa 11 for pappi, low coarseness values (0.04 and 0.03mgm−1) and adequate pulp properties for paper (40 and 42Nmg−1 tensile index; 3.6 and 3.4 kPam2 g−1 burst index in unrefined pulps of hairs and pappi, respectively). The results also indicated that there is scope for improving pulp quality by optimising pulping conditions to this type of new raw materials. The differences between hairs and pappi may also be further exploited namely the lower lignin content of hairs and the higher slenderness and wall thickness of pappi fibres. The utilization of hairs and pappi may strengthen the differentiated use of biomass fractions of the Cynara plant and its potential as a bioenergy crop. |
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Characterization of hairs and pappi from Cynara cardunculus capitula and their suitability for paper productionCynara cardunculus L.hairspappichemical compositionkraft pulpanatomyThe capitula of Cynara cardunculus contain hairs and pappi representing 7% of the total plant biomass. These low density biomass components could be mechanically separated without apparent losses using a whole-plant processing prototype. Hairs and pappi are filamentous structures made up of longitudinally aligned fibre cells, without intercellular voids or pitting, with the following dimensions regarding length, width and wall thickness: 1.35mm, 19.8, and 4.8 m for hairs and 1.78mm, 10.4, and 2.9 m for pappi. Chemically hairs and pappi have low content of ash (1.9% and 1.1%, respectively), extractives (5.4% and 6.0%) and lignin (10.6% and 17.8%), and high content of holocellulose (77.5% and 72.8%) and -cellulose (55.2% and 46.8%). Pulps could be produced using a conventional kraft process with high yields and low residual lignin, e.g. 63% at Kappa 7 for hairs and 48% at Kappa 11 for pappi, low coarseness values (0.04 and 0.03mgm−1) and adequate pulp properties for paper (40 and 42Nmg−1 tensile index; 3.6 and 3.4 kPam2 g−1 burst index in unrefined pulps of hairs and pappi, respectively). The results also indicated that there is scope for improving pulp quality by optimising pulping conditions to this type of new raw materials. The differences between hairs and pappi may also be further exploited namely the lower lignin content of hairs and the higher slenderness and wall thickness of pappi fibres. The utilization of hairs and pappi may strengthen the differentiated use of biomass fractions of the Cynara plant and its potential as a bioenergy crop.ElsevierRepositório da Universidade de LisboaGominho, JorgeLourenço, AnaCurt, MariaFernández, JesúsPereira, Helena2015-03-05T15:05:45Z20092009-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.5/8108eng"Industrial Crops and Products". ISSN 0926-6690. 29 (2009) 116-12510.1016/j.indcrop.2008.04.022info: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:RCAAP2023-03-06T14:38:45Zoai:www.repository.utl.pt:10400.5/8108Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:55:10.495228Repositório 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 |
Characterization of hairs and pappi from Cynara cardunculus capitula and their suitability for paper production |
title |
Characterization of hairs and pappi from Cynara cardunculus capitula and their suitability for paper production |
spellingShingle |
Characterization of hairs and pappi from Cynara cardunculus capitula and their suitability for paper production Gominho, Jorge Cynara cardunculus L. hairs pappi chemical composition kraft pulp anatomy |
title_short |
Characterization of hairs and pappi from Cynara cardunculus capitula and their suitability for paper production |
title_full |
Characterization of hairs and pappi from Cynara cardunculus capitula and their suitability for paper production |
title_fullStr |
Characterization of hairs and pappi from Cynara cardunculus capitula and their suitability for paper production |
title_full_unstemmed |
Characterization of hairs and pappi from Cynara cardunculus capitula and their suitability for paper production |
title_sort |
Characterization of hairs and pappi from Cynara cardunculus capitula and their suitability for paper production |
author |
Gominho, Jorge |
author_facet |
Gominho, Jorge Lourenço, Ana Curt, Maria Fernández, Jesús Pereira, Helena |
author_role |
author |
author2 |
Lourenço, Ana Curt, Maria Fernández, Jesús Pereira, Helena |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Repositório da Universidade de Lisboa |
dc.contributor.author.fl_str_mv |
Gominho, Jorge Lourenço, Ana Curt, Maria Fernández, Jesús Pereira, Helena |
dc.subject.por.fl_str_mv |
Cynara cardunculus L. hairs pappi chemical composition kraft pulp anatomy |
topic |
Cynara cardunculus L. hairs pappi chemical composition kraft pulp anatomy |
description |
The capitula of Cynara cardunculus contain hairs and pappi representing 7% of the total plant biomass. These low density biomass components could be mechanically separated without apparent losses using a whole-plant processing prototype. Hairs and pappi are filamentous structures made up of longitudinally aligned fibre cells, without intercellular voids or pitting, with the following dimensions regarding length, width and wall thickness: 1.35mm, 19.8, and 4.8 m for hairs and 1.78mm, 10.4, and 2.9 m for pappi. Chemically hairs and pappi have low content of ash (1.9% and 1.1%, respectively), extractives (5.4% and 6.0%) and lignin (10.6% and 17.8%), and high content of holocellulose (77.5% and 72.8%) and -cellulose (55.2% and 46.8%). Pulps could be produced using a conventional kraft process with high yields and low residual lignin, e.g. 63% at Kappa 7 for hairs and 48% at Kappa 11 for pappi, low coarseness values (0.04 and 0.03mgm−1) and adequate pulp properties for paper (40 and 42Nmg−1 tensile index; 3.6 and 3.4 kPam2 g−1 burst index in unrefined pulps of hairs and pappi, respectively). The results also indicated that there is scope for improving pulp quality by optimising pulping conditions to this type of new raw materials. The differences between hairs and pappi may also be further exploited namely the lower lignin content of hairs and the higher slenderness and wall thickness of pappi fibres. The utilization of hairs and pappi may strengthen the differentiated use of biomass fractions of the Cynara plant and its potential as a bioenergy crop. |
publishDate |
2009 |
dc.date.none.fl_str_mv |
2009 2009-01-01T00:00:00Z 2015-03-05T15:05:45Z |
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/10400.5/8108 |
url |
http://hdl.handle.net/10400.5/8108 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
"Industrial Crops and Products". ISSN 0926-6690. 29 (2009) 116-125 10.1016/j.indcrop.2008.04.022 |
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 |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
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 |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
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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1799131028814561280 |