Enzymatic removal of free and conjugated sterols forming pitch deposits in environmentally sound bleaching of eucalypt paper pulp
Instituto de Recursos Naturales y Agrobiología, CSIC, PO Box 1052, E-41080, Seville, Spain; Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, E-28040 Madrid, Spain; CIT, ENCE, Carretera de Campañó s/n, E-36157 Ribeiro Vao, Pontevedra, Spain
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| Language: | English |
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American Chemical Society
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| Subjects: | Pitch, Sterols, Paper pulp, Laccases, |
| Online Access: | http://hdl.handle.net/10261/39907 http://dx.doi.org/10.13039/501100003339 http://dx.doi.org/10.13039/501100000780 |
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dig-irnas-es-10261-399072020-11-13T13:29:41Z Enzymatic removal of free and conjugated sterols forming pitch deposits in environmentally sound bleaching of eucalypt paper pulp Gutiérrez Suárez, Ana Río Andrade, José Carlos del Ibarra, David Rencoret, Jorge Romero Sánchez, Javier Speranza, Mariela Camarero, Susana Martínez, María Jesús Martínez, Ángel T. Ence Energía y Celulosa Consejo Superior de Investigaciones Científicas (España) European Commission Pitch Sterols Paper pulp Laccases Instituto de Recursos Naturales y Agrobiología, CSIC, PO Box 1052, E-41080, Seville, Spain; Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, E-28040 Madrid, Spain; CIT, ENCE, Carretera de Campañó s/n, E-36157 Ribeiro Vao, Pontevedra, Spain Free and conjugated sterols are among the main compounds responsible for pitch deposition in the manufacture of wood chemical pulps, making difficult the implementation of totally chlorine free bleaching (TCF) and closure of bleach plant circuits. In this work, the suitability of oxidative enzymes in efficiently removing sterols from eucalypt pulps is revealed. The enzymatic treatment was applied as an additional stage of an industrial-type TCF sequence for bleaching eucalypt kraft pulp. The pulp obtained after oxygen delignification was treated with a highredox potential and thermostable fungal laccase using 1-hydroxybenzotriazole as an enzyme mediator. This pulp was further submitted to chelation and peroxide stages and compared with a control TCF pulp obtained using chemical reagents. The composition of the lipophilic extractives in the pulps and the corresponding liquids after the different stages was analyzed by gas chromatography and gas chromatography-mass spectrometry. Free sitosterol and sitosterol esters and glucosides, the major lipophilic compounds in eucalypt pulps, were completely removed during the laccase-mediator treatment. Only some intermediate products from sitosterol oxidation remained after the laccase stage, as well as in the final pulp. Pulp brightness was also improved due to the simultaneous removal of lignin by the laccase-mediator treatment. This study has been funded by the Spanish projects AGL2002-393 and BIO2002-1166, the EU projects "New environmentally-sound methods for pitch control in different paper pulp manufacturing processes" (contract QLK5-99-1357) and "Fungal metalloenzymes oxidizing aromatic compounds of industrial interest" (contract QLK3-99-590), and two ENCE-CSIC contracts. Peer reviewed 2006 artículo http://purl.org/coar/resource_type/c_6501 Environmental Science & Technology 40:3416-3422 (2006) http://hdl.handle.net/10261/39907 10.1021/es052547p http://dx.doi.org/10.13039/501100003339 http://dx.doi.org/10.13039/501100000780 en open American Chemical Society |
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Pitch Sterols Paper pulp Laccases Pitch Sterols Paper pulp Laccases |
| spellingShingle |
Pitch Sterols Paper pulp Laccases Pitch Sterols Paper pulp Laccases Gutiérrez Suárez, Ana Río Andrade, José Carlos del Ibarra, David Rencoret, Jorge Romero Sánchez, Javier Speranza, Mariela Camarero, Susana Martínez, María Jesús Martínez, Ángel T. Enzymatic removal of free and conjugated sterols forming pitch deposits in environmentally sound bleaching of eucalypt paper pulp |
| description |
Instituto de Recursos Naturales y Agrobiología, CSIC, PO Box 1052, E-41080, Seville, Spain; Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, E-28040 Madrid, Spain; CIT, ENCE, Carretera de Campañó s/n, E-36157 Ribeiro Vao, Pontevedra, Spain |
| author2 |
Ence Energía y Celulosa |
| author_facet |
Ence Energía y Celulosa Gutiérrez Suárez, Ana Río Andrade, José Carlos del Ibarra, David Rencoret, Jorge Romero Sánchez, Javier Speranza, Mariela Camarero, Susana Martínez, María Jesús Martínez, Ángel T. |
| format |
artículo |
| topic_facet |
Pitch Sterols Paper pulp Laccases |
| author |
Gutiérrez Suárez, Ana Río Andrade, José Carlos del Ibarra, David Rencoret, Jorge Romero Sánchez, Javier Speranza, Mariela Camarero, Susana Martínez, María Jesús Martínez, Ángel T. |
| author_sort |
Gutiérrez Suárez, Ana |
| title |
Enzymatic removal of free and conjugated sterols forming pitch deposits in environmentally sound bleaching of eucalypt paper pulp |
| title_short |
Enzymatic removal of free and conjugated sterols forming pitch deposits in environmentally sound bleaching of eucalypt paper pulp |
| title_full |
Enzymatic removal of free and conjugated sterols forming pitch deposits in environmentally sound bleaching of eucalypt paper pulp |
| title_fullStr |
Enzymatic removal of free and conjugated sterols forming pitch deposits in environmentally sound bleaching of eucalypt paper pulp |
| title_full_unstemmed |
Enzymatic removal of free and conjugated sterols forming pitch deposits in environmentally sound bleaching of eucalypt paper pulp |
| title_sort |
enzymatic removal of free and conjugated sterols forming pitch deposits in environmentally sound bleaching of eucalypt paper pulp |
| publisher |
American Chemical Society |
| url |
http://hdl.handle.net/10261/39907 http://dx.doi.org/10.13039/501100003339 http://dx.doi.org/10.13039/501100000780 |
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