Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/3310
COMPARTIR / EXPORTAR:
logo share SHARE BASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE

Invitar a revisión por pares abierta
Título

Removal of lipophilic extractives from paper pulp by laccase and lignin-derived phenols as natural mediators

AutorGutiérrez Suárez, Ana CSIC ORCID ; Rencoret, Jorge CSIC ORCID; Ibarra, David CSIC ORCID; Molina, Setefilla CSIC; Camarero, Susana CSIC ORCID ; Romero Sánchez, Javier; Río Andrade, José Carlos del CSIC ORCID ; Martínez, Ángel T. CSIC ORCID
Palabras clavepitch
laccase
lipophilic extractives
Fecha de publicación2007
CitaciónEnvironm. Sci. & Technol. 41, 4124-4129.
ResumenIn this paper, we show for the first time that ligninderived phenols can act as laccase mediators for the removal of lipophilic compounds from paper pulp. These natural mediators represent an alternative to synthetic mediators, such as 1-hydroxybenzotriazole (HBT), that cause some economic and environmental concerns. Unbleached kraft pulp from eucalypt wood, which contained free and conjugated sterols responsible for pitch deposition in the manufacture of totally chlorine free paper, was treated with a fungal laccase in the presence of syringaldehyde, acetosyringone, and p-coumaric acid as mediators. The composition of lipophilic extractives in the pulps after the enzymatic treatment followed by a hydrogen peroxide stage was analyzed by gas chromatography and gas chromatography/mass spectrometry. The enzymatic treatment using syringaldehyde as laccase mediator caused the highest removal (over 90%) of free and conjugated sitosterol, similar to that attained with HBT, followed by acetosyringone (over 60% removal), whereas p-coumaric acid was barely effective. Moreover, recalcitrant oxidized steroids surviving laccase-HBT treatment could be removed when using these natural mediators. Pulp brightness was also improved (from 57% to 66% ISO brightness) by the laccase treatment in the presence of the above phenols followed by the peroxide stage due to the simultaneous removal of lignin.
URIhttp://hdl.handle.net/10261/3310
Aparece en las colecciones: (IRNAS) Artículos
(CIB) Artículos




Ficheros en este ítem:
Fichero Descripción Tamaño Formato
2007-Gutierrez-EST-41-4124.pdf153,58 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo

CORE Recommender

Page view(s)

437
checked on 18-mar-2024

Download(s)

352
checked on 18-mar-2024

Google ScholarTM

Check


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.