title: Influence of process variables on the properties of laccase biobleached pulps.
abstract: A laccase stage can be used as a pre-treatment of a standard chemical bleaching sequence to reduce environmental concerns associated to this process. The importance of each independent variable and its influence on the properties of the bleached pulp have been studied in depth in this work, using an adaptive network-based fuzzy inference system (ANFIS) with four independent variables (laccase, buffer, mediator and oxygen) as input. Eucalyptus globulus kraft pulp was biobleached using a laccase from Pycnoporus sanguineus and a natural mediator (acetosyringone). Later, an alkaline extraction and a hydrogen peroxide treatment were applied. Most biobleaching processes showed a decrease in kappa number and an increase in brightness with no significant impact on the viscosity values, compared with the control. Oxygen was the variable with the smallest influence on the final pulp properties while the laccase and buffer solution showed a significant influence.
authors.affiliation: Cellulose and Paper Laboratory, Forest Product Department, INIA-CIFOR, Carretera de la Coruña, km 7.5, 28040, Madrid, Spain, martin.raquel@inia.es.
authors.forename: Raquel
authors.initials: R
authors.lastname: Martin-Sampedro
authors.forename: Jesús
authors.initials: J
authors.lastname: Miranda
authors.forename: Luisa L
authors.initials: LL
authors.lastname: García-Fuentevilla
authors.forename: Manuel
authors.initials: M
authors.lastname: Hernández
authors.forename: Maria E
authors.initials: ME
authors.lastname: Arias
authors.forename: Manuel J
authors.initials: MJ
authors.lastname: Diaz
authors.forename: Maria E
authors.initials: ME
authors.lastname: Eugenio
mesh_terms: D005052:Eucalyptus / Q000378:metabolism; D017143:Fuzzy Logic; D042845:Laccase / Q000378:metabolism*; D010209:Paper; D055494:Pycnoporus / Q000201:enzymology; D013783:Textile Industry
chemical_list: D042845:Laccase