• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Study on the enzymatic bleaching of kraft pulp

Research Project

Project/Area Number 04660191
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 林産学
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

KONDO Ryuichiro  Kyushu University, Faculty of Agriculture, Associate Professor, 農学部, 助教授 (80091370)

Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1993: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1992: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsEnzyme bleaching / Kraft pulp / Phanerochaete sordida / Brightness / Manganese peroxidase / Phanerochaete sordida / マンガンペルオキシターゼ / 非塩素系漂白 / 木材腐朽菌 / 白色腐朽菌 / バイオブリーチング / ダイオキシン / リグニン分解酵素
Research Abstract

To Clarify the role of the excreted extracellular enzymes during long-term incubation in a pulp biobleaching system with white-rot fungi, we have developed a cultivation system using a membrane filter which can prevent the direct contact between hyphae and kraft pulp, but allows extracellular enzymes to attack the kraft pulp. Phanerochaete sordida YK-624 brightened the pulp 21.4points to 54.0% brightness after 5-day in vitro treatment, which was significantly higher than phanerochaete chrysosporium and Coriolus versicolor did during 7-day treatment. These results indicate that cell-free, membrane-filtered components from the in vitro bleaching system are capable of delignifying unbleached kraft pulp. Obvious candidates for filterable reagents capable of delignifying and bleaching kraft pulp are peroxidase and phenoloxidase proteins. Secreted manganese peroxidase activity in the filterable components was substantial during the fungus YK-624 in vitro bleaching. A positive correlation between the level of manganese peroxidase and brightening of the pulp was observed.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (3 results)

All Other

All Publications (3 results)

  • [Publications] 近藤隆一郎: "In Vitro Bleaching of Hardwood Kraft Pulp by Extracellular Enzymes Excreted from White Rot Fungi in a Cultivation System Using a Membrane Filter." Applied and Environmental Microbiology. 60. (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Ryuichiro KONDO: "In Vitro Bleaching of Hardwood Kraft Pulp by Extracellular Enzymes Excreted from White Rot Fungi in a Cultivation System Using a membrane Filter." Applied and Environmental Microbiology. volume 60, issue 3. (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 近藤,隆一郎: "In Vitro Bleaching of Hardwood Kraft Pulp by Extracellular Engymes Excreted from white Ret Fungi in a Cultivation System Using a Membrane Filter" Applied and Environmental Microbiology. 60. (1994)

    • Related Report
      1993 Annual Research Report

URL: 

Published: 1992-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi