New pulp biobleaching system involving manganese peroxidase immobilized in a silica support with controlled pore sizes

Applied and Environmental Microbiology
T SasakiH Takahashi

Abstract

Attempts have been made to use manganese peroxidase (MnP) for chlorine-free pulp biobleaching, but they have not been commercially viable because of the enzyme's low stability. We developed a new pulp biobleaching method involving mesoporous material-immobilized manganese peroxidase from Phanerochaete chrysosporium. MnP immobilized in FSM-16, a folded-sheet mesoporous material whose pore size is nearly the same as the diameter of the enzyme, had the highest thermal stability and tolerance to H(2)O(2). MnP immobilized in FSM-16 retained more than 80% of its initial activity even after 10 days of continuous reaction. We constructed a thermally discontinuous two-stage reactor system, in which the enzyme (39 degrees C) and pulp-bleaching (70 degrees C) reactions were performed separately. When the treatment of pulp with MnP by means of the two-stage reactor system and alkaline extraction was repeated seven times, the brightness of the pulp increased to about 88% within 7 h after completion of the last treatment.

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Citations

Sep 11, 2014·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Paolo Zucca, Enrico Sanjust
Sep 23, 2008·Trends in Biotechnology·Jungbae KimPing Wang
Apr 22, 2011·Biotechnology Progress·Roberto Taboada-PuigJuan Manuel Lema
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Mar 2, 2006·Journal of Agricultural and Food Chemistry·Mohammad A KhiyamiWilliam J Kennedy

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