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Investigating the structure–effect relationships of various natural phenols used as laccase mediators in the biobleaching of kenaf and sisal pulps
- Source :
- Bioresource Technology. 112:327-335
- Publication Year :
- 2012
- Publisher :
- Elsevier BV, 2012.
-
Abstract
- Nine phenol derivatives, p-coumaric acid (PC), vanillin (V), acetovanillone (AV), acetosyringone (AS), syringaldehyde (SA), coniferaldehyde (CLD), ferulic acid (FRC), sinapic acid (SNC), and sinapyl aldehyde (SLD) were assayed as laccase redox mediators in the biobleaching of kenaf and sisal pulps. As a general behaviour, the phenolic mediators increased the kappa number (KN) and reduced the brightness of pulps. In particular, these changes were found to depend in a linear manner on the energy of the highest occupied molecular orbital (EHOMO) of the mediators. The phenolic mediator with the lowest EHOMO (PC) led to the highest increase of KN and the lowest reduction of brightness. On the contrary, syringyl derivatives (i.e. SA) with high EHOMO values caused small KN increases and significant losses of brightness. This behaviour was explained on the basis of a competition between grafting and polymerisation processes. The former basically affects KN, whereas the latter affects pulp brightness.
- Subjects :
- Paper
Environmental Engineering
Free Radicals
Bioengineering
engineering.material
Kappa number
Syringaldehyde
Ferulic acid
Structure-Activity Relationship
chemistry.chemical_compound
Agave
Phenols
Organic chemistry
Waste Management and Disposal
Trametes
Laccase
biology
Renewable Energy, Sustainability and the Environment
Chemistry
Vanillin
Pulp (paper)
General Medicine
biology.organism_classification
Kenaf
Hibiscus
engineering
Thermodynamics
Biotechnology
Hydrogen
Subjects
Details
- ISSN :
- 09608524
- Volume :
- 112
- Database :
- OpenAIRE
- Journal :
- Bioresource Technology
- Accession number :
- edsair.doi.dedup.....e45628927c18082b856c7f976d94dffb