Towards industrially-feasible delignification and pitch removal by treating paper pulp with Myceliophthora thermophila laccase and a phenolic mediator
2011
Babot, Esteban Daniel | Rico Campos, Alejandro | Rencoret, Jorge | Kalum, Lisbeth | Lund, Henrik | Romero Sánchez, Javier | Río Andrade, José Carlos del | Río Andrade, José Carlos del | Martínez, Ángel T. | Gutiérrez Suárez, Ana | Ministerio de Economía y Competitividad (España) | European Commission
The ability of two natural phenols to act as mediators of the recombinant Myceliophthora thermophila laccase (MtL) in eucalypt-pulp delignification was investigated. After alkaline peroxide extraction, the properties of the enzymatically-treated pulps improved with respect to the control. The pulp brightness increased (3.1 points) after the enzymatic treatment with MtL alone, but the highest improvements were obtained after the MtL treatment using syringaldehyde (4.7 points) and especially methyl syringate (8.3 points) as mediators. Likewise, a decrease in kappa number up to 2.7 points was obtained after the MtL–methyl syringate treatment, followed by decreases of 1.4 and 0.9 points after the treatments with MtL–syringaldehyde and MtL alone, respectively. On the other hand, removal of the main lipophilic extractives present in eucalypt pulp was observed after the above laccase–mediator treatments. Finally, the doses of both MtL and methyl syringate were reduced, and results compatible with industrial implementation were obtained.
Afficher plus [+] Moins [-]This study was funded by the BIORENEW and LIGNODECO EU projects (NMP2-CT-2006-026456 and KBBE-2009-3-244362, respectively) and the ELLE and RAPERO Spanish MICINN (co-financed by FEDER funds) projects AGL2008-00709 and BIO2008-01533, respectively).
Afficher plus [+] Moins [-]Peer reviewed
Afficher plus [+] Moins [-]Mots clés AGROVOC
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