Biobleaching of Softwood Kraft Pulp by White-Rot Fungi and Its Related Enzymes

Nobuyuki Katagiri, Yuji Tsutsumi, Tomoaki Nishida

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The roles of oxidizing enzymes produced during the biobleaching of unbleached softwood kraft pulps (SWKPs) by Phanerochaete chrysosporium and Trametes versicolor were investigated. Both fungi produced laccase and manganese peroxidase (MnP), but lignin peroxidase production was not observed. While no appreciable delignification of SWKP was obtained by T. versicolor, laccase was produced extensively with this fungus compared with P. chrysosporium which showed greater delignification. The MnP production during the delignification of SWKP by P. chrysosporium was much less than that of unbleached hardwood kraft pulp (HWKP). Furthermore, in vitro, isolated MnP cannot degrade residual Iignin in SWKP without the addition of Mn(II). although MnP can degrade that in HWKP. The addition of Mn(II) enhanced the MnP production and delignification during the biobleaching of SWKP by P. chrysosporium. The delignification of SWKP by an in vitro MnP treatment also was obtained with Mn(II)-addition. Therefore, MnP may be involved mostly in the delignification of SWKP under Mn(II)-sufficient conditions, although other enzymes, except MnP, may contribute to the delignification of SWKP under Mn(II)-insufficient conditions.

元の言語英語
ページ(範囲)678-685
ページ数8
ジャーナルMokuzai Gakkaishi/Journal of the Japan Wood Research Society
43
発行部数8
出版物ステータス出版済み - 12 1 1997
外部発表Yes

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)

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