Impact of hexenuronic acids on hylanase-aided bio-bleaching of chemical pulps

Detalhes bibliográficos
Autor(a) principal: Shatalov, Anatoly A.
Data de Publicação: 2009
Outros Autores: Pereira, Helena
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.5/9053
Resumo: Hexenuronic acids (HexA) of hemicellulosic heteroxylan were shown to play important role in brightness development of chemical pulps during xylanase-aided bio-bleaching. Industrial wood (eucalypt) kraft pulp and a few non-wood (giant reed) organosolv pulps were pre-treated with commercial xylanase preparations (endo-1,4-b-xylanase activity; EC 3.2.1.8) and bleached by simplified bleaching sequence. The HexA performance was examined and compared with control (enzyme-free) samples. The xylanase- assisted direct brightening effect, noted immediately after an enzymatic stage, was proved to be caused by exclusive HexA removal with solubilized HexA-carrying xylooligosaccharide fractions. Aldohexa- and aldopentahexenuronic acids (Xyl5-HexA and Xyl4-HexA) were found as predominant oligosaccharides, accounting for up to 65% of total acidic oligomers in enzymatic hydrolyzates. A strong positive correlation (R2 = 0.91) was established between further brightness improvement of xylanase-treated pulps during subsequent chemical bleaching (bleach boosting) and the content of HexA. This underlined the role of HexA as one of the key factors in definition of final brightness of bio-bleached pulps, determining to a large extent the bleaching efficiency of xylanase application as a whole
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spelling Impact of hexenuronic acids on hylanase-aided bio-bleaching of chemical pulpshexenuronic acidxylanasebio-bleachingchemical pulpbrightnessHexenuronic acids (HexA) of hemicellulosic heteroxylan were shown to play important role in brightness development of chemical pulps during xylanase-aided bio-bleaching. Industrial wood (eucalypt) kraft pulp and a few non-wood (giant reed) organosolv pulps were pre-treated with commercial xylanase preparations (endo-1,4-b-xylanase activity; EC 3.2.1.8) and bleached by simplified bleaching sequence. The HexA performance was examined and compared with control (enzyme-free) samples. The xylanase- assisted direct brightening effect, noted immediately after an enzymatic stage, was proved to be caused by exclusive HexA removal with solubilized HexA-carrying xylooligosaccharide fractions. Aldohexa- and aldopentahexenuronic acids (Xyl5-HexA and Xyl4-HexA) were found as predominant oligosaccharides, accounting for up to 65% of total acidic oligomers in enzymatic hydrolyzates. A strong positive correlation (R2 = 0.91) was established between further brightness improvement of xylanase-treated pulps during subsequent chemical bleaching (bleach boosting) and the content of HexA. This underlined the role of HexA as one of the key factors in definition of final brightness of bio-bleached pulps, determining to a large extent the bleaching efficiency of xylanase application as a wholeElsevierRepositório da Universidade de LisboaShatalov, Anatoly A.Pereira, Helena2015-07-23T15:36:11Z20092009-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.5/9053eng"Bioresource Technology". ISSN 0960-8524. 100 (2009) 3069-307510.1016/j.biortech.2009.01.020info: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:RCAAP2023-03-06T14:39:34Zoai:www.repository.utl.pt:10400.5/9053Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:55:53.802427Repositório 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 Impact of hexenuronic acids on hylanase-aided bio-bleaching of chemical pulps
title Impact of hexenuronic acids on hylanase-aided bio-bleaching of chemical pulps
spellingShingle Impact of hexenuronic acids on hylanase-aided bio-bleaching of chemical pulps
Shatalov, Anatoly A.
hexenuronic acid
xylanase
bio-bleaching
chemical pulp
brightness
title_short Impact of hexenuronic acids on hylanase-aided bio-bleaching of chemical pulps
title_full Impact of hexenuronic acids on hylanase-aided bio-bleaching of chemical pulps
title_fullStr Impact of hexenuronic acids on hylanase-aided bio-bleaching of chemical pulps
title_full_unstemmed Impact of hexenuronic acids on hylanase-aided bio-bleaching of chemical pulps
title_sort Impact of hexenuronic acids on hylanase-aided bio-bleaching of chemical pulps
author Shatalov, Anatoly A.
author_facet Shatalov, Anatoly A.
Pereira, Helena
author_role author
author2 Pereira, Helena
author2_role author
dc.contributor.none.fl_str_mv Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Shatalov, Anatoly A.
Pereira, Helena
dc.subject.por.fl_str_mv hexenuronic acid
xylanase
bio-bleaching
chemical pulp
brightness
topic hexenuronic acid
xylanase
bio-bleaching
chemical pulp
brightness
description Hexenuronic acids (HexA) of hemicellulosic heteroxylan were shown to play important role in brightness development of chemical pulps during xylanase-aided bio-bleaching. Industrial wood (eucalypt) kraft pulp and a few non-wood (giant reed) organosolv pulps were pre-treated with commercial xylanase preparations (endo-1,4-b-xylanase activity; EC 3.2.1.8) and bleached by simplified bleaching sequence. The HexA performance was examined and compared with control (enzyme-free) samples. The xylanase- assisted direct brightening effect, noted immediately after an enzymatic stage, was proved to be caused by exclusive HexA removal with solubilized HexA-carrying xylooligosaccharide fractions. Aldohexa- and aldopentahexenuronic acids (Xyl5-HexA and Xyl4-HexA) were found as predominant oligosaccharides, accounting for up to 65% of total acidic oligomers in enzymatic hydrolyzates. A strong positive correlation (R2 = 0.91) was established between further brightness improvement of xylanase-treated pulps during subsequent chemical bleaching (bleach boosting) and the content of HexA. This underlined the role of HexA as one of the key factors in definition of final brightness of bio-bleached pulps, determining to a large extent the bleaching efficiency of xylanase application as a whole
publishDate 2009
dc.date.none.fl_str_mv 2009
2009-01-01T00:00:00Z
2015-07-23T15:36:11Z
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/10400.5/9053
url http://hdl.handle.net/10400.5/9053
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv "Bioresource Technology". ISSN 0960-8524. 100 (2009) 3069-3075
10.1016/j.biortech.2009.01.020
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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