Impact of hexenuronic acids on hylanase-aided bio-bleaching of chemical pulps
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/10400.5/9053 |
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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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 |
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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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1799131041227603968 |