Investigating the structure–effect relationships of various natural phenols used as laccase mediators in the biobleaching of kenaf and sisal pulps
| Autor: | Teresa Vidal, Agustín García Barneto, Glòria Andreu, Elisabetta Aracri |
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| Rok vydání: | 2012 |
| Předmět: |
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 |
| Zdroj: | Bioresource Technology. 112:327-335 |
| ISSN: | 0960-8524 |
| DOI: | 10.1016/j.biortech.2012.02.136 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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