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dc.contributor.authorMarques, Gisela-
dc.contributor.authorGamelas, José A. F.-
dc.contributor.authorRuiz-Dueñas, F. J.-
dc.contributor.authorRío Andrade, José Carlos del-
dc.contributor.authorEvtuguin, Dmitry-
dc.contributor.authorMartínez, Ángel T.-
dc.contributor.authorGutiérrez Suárez, Ana-
dc.identifier.citationProceedings of the 11th European Workshop on Lignocelluilosics and Pulp, pp. 109-112.es_ES
dc.description.abstractThe oxidation of manganese-substituted polyoxometalate [SiW11MnII(H2O)O39]6- (SiW11MnII) to active in selective kraft pulp delignification specie [SiW11MnIII(H2O)O39]5- (SiW11MnIII) by versatile peroxidase (VP) was studied. Releasing upon lignin oxidation SiW11MnII was quickly oxidized by VP even at room temperature in the presence of H2O2 (Km= 6.4±0.7 mM and kcat= 47±2 s-1). This allowed 95-100% reoxidation of reduced polyoxometalate with VP/H2O2 in the filtrate from eucalypt pulp delignification. In this way, it was possible to reuse the liquor from a SiW11MnIII/O2 stage for further delignification, in a sequence constituted by two polyoxometalate stages, with a short intermediate step consisting of the addition of VP/H2O2 to the filtrate for SiW11MnII reoxidation. When the first D stage of a conventional DEDED bleaching sequence was substituted by the two-stage delignification with polyoxometalate (POM) assisted by VP (POM-VP-POM), a 50% saving in ClO2 consumption was obtained for similar mechanical strength of the final pulp (89%ISO brightness).es_ES
dc.description.sponsorshipThis study has been supported by the EU project BIORENEW (NMP2-CT-2006-026456) and the Spanish projects AGL2008-00709 and BIO2008-01533. We thank ENCE (Pontevedra, Spain) for pulp samples. G. M. and F. J. R.-D. thank the Spanish MICINN for a FPI fellowship and a Ramon y Cajal contract, respectively.es_ES
dc.publisherJohann-Heinrich von Thünen Medaillees_ES
dc.subjectKraft Pulpes_ES
dc.titleBiomimetic delignification of kraft pulp employng polyoxometalate and versatile peroxidasees_ES
dc.typecomunicación de congresoes_ES
dc.description.peerreviewedPeer reviewedes_ES
Appears in Collections:(IRNAS) Comunicaciones congresos
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