Comparative study of cellulose fragmentation by enzymes and ultrasound
Autor(a) principal: | |
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Data de Publicação: | 1997 |
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/1822/1050 |
Resumo: | The stability in aqueous suspensions of two particulate celluloses, Sigmacell type 100 and Avicel PH101, was analyzed. The effect of the presence of a cellulase from Trichodenna reesei, ionic strength, and ultrasonic agitation on the fragmentation/aggregation phenomena was studied. Particle size distributions of the powders were obtained with three different particle sizers: the Galai CIS 100, the Coulter Multisizer II, and the Malvem 2600c. The differences in the obtained absolute values are discussed according to the measuring principles of each technique; however, the overall conclusions are independent of the particle sizer used. The enzyme breaks up the Avicel aggregates more effectively than ultrasound while the Sigmacell particles are stable under the present experimental conditions. The stabilizing effect of cellulases was tentatively explained using the DLVO (Derjaguin, Landau, Verweye, and Overbeek) theory. The adsorbed enzyme did not change significantly the zeta potential of the fibers; hence, the stabilizing effect was attributed to a reduction in the attractive van der Waals forces and hydration effects. |
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Comparative study of cellulose fragmentation by enzymes and ultrasoundCelluloseSize analysisParticle size distributionCellulaseFragmentationScience & TechnologyThe stability in aqueous suspensions of two particulate celluloses, Sigmacell type 100 and Avicel PH101, was analyzed. The effect of the presence of a cellulase from Trichodenna reesei, ionic strength, and ultrasonic agitation on the fragmentation/aggregation phenomena was studied. Particle size distributions of the powders were obtained with three different particle sizers: the Galai CIS 100, the Coulter Multisizer II, and the Malvem 2600c. The differences in the obtained absolute values are discussed according to the measuring principles of each technique; however, the overall conclusions are independent of the particle sizer used. The enzyme breaks up the Avicel aggregates more effectively than ultrasound while the Sigmacell particles are stable under the present experimental conditions. The stabilizing effect of cellulases was tentatively explained using the DLVO (Derjaguin, Landau, Verweye, and Overbeek) theory. The adsorbed enzyme did not change significantly the zeta potential of the fibers; hence, the stabilizing effect was attributed to a reduction in the attractive van der Waals forces and hydration effects.ElsevierUniversidade do MinhoGama, F. M.Carvalho, M. G.Figueiredo, M. M.Mota, M.1997-011997-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/1050eng"Enzyme & microbial technology". 20 (1997) 12-17.0141-022910.1016/S0141-0229(96)00076-2info: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:RCAAP2023-07-21T12:43:27Zoai:repositorium.sdum.uminho.pt:1822/1050Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:40:56.658824Repositório 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 |
Comparative study of cellulose fragmentation by enzymes and ultrasound |
title |
Comparative study of cellulose fragmentation by enzymes and ultrasound |
spellingShingle |
Comparative study of cellulose fragmentation by enzymes and ultrasound Gama, F. M. Cellulose Size analysis Particle size distribution Cellulase Fragmentation Science & Technology |
title_short |
Comparative study of cellulose fragmentation by enzymes and ultrasound |
title_full |
Comparative study of cellulose fragmentation by enzymes and ultrasound |
title_fullStr |
Comparative study of cellulose fragmentation by enzymes and ultrasound |
title_full_unstemmed |
Comparative study of cellulose fragmentation by enzymes and ultrasound |
title_sort |
Comparative study of cellulose fragmentation by enzymes and ultrasound |
author |
Gama, F. M. |
author_facet |
Gama, F. M. Carvalho, M. G. Figueiredo, M. M. Mota, M. |
author_role |
author |
author2 |
Carvalho, M. G. Figueiredo, M. M. Mota, M. |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Gama, F. M. Carvalho, M. G. Figueiredo, M. M. Mota, M. |
dc.subject.por.fl_str_mv |
Cellulose Size analysis Particle size distribution Cellulase Fragmentation Science & Technology |
topic |
Cellulose Size analysis Particle size distribution Cellulase Fragmentation Science & Technology |
description |
The stability in aqueous suspensions of two particulate celluloses, Sigmacell type 100 and Avicel PH101, was analyzed. The effect of the presence of a cellulase from Trichodenna reesei, ionic strength, and ultrasonic agitation on the fragmentation/aggregation phenomena was studied. Particle size distributions of the powders were obtained with three different particle sizers: the Galai CIS 100, the Coulter Multisizer II, and the Malvem 2600c. The differences in the obtained absolute values are discussed according to the measuring principles of each technique; however, the overall conclusions are independent of the particle sizer used. The enzyme breaks up the Avicel aggregates more effectively than ultrasound while the Sigmacell particles are stable under the present experimental conditions. The stabilizing effect of cellulases was tentatively explained using the DLVO (Derjaguin, Landau, Verweye, and Overbeek) theory. The adsorbed enzyme did not change significantly the zeta potential of the fibers; hence, the stabilizing effect was attributed to a reduction in the attractive van der Waals forces and hydration effects. |
publishDate |
1997 |
dc.date.none.fl_str_mv |
1997-01 1997-01-01T00:00:00Z |
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/1822/1050 |
url |
http://hdl.handle.net/1822/1050 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
"Enzyme & microbial technology". 20 (1997) 12-17. 0141-0229 10.1016/S0141-0229(96)00076-2 |
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 |
repository.mail.fl_str_mv |
|
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1799132956564914176 |