Oxalic acid extraction as a posttreatment to increase the brightness of kraft pulps bleached by white-rot fungi

M. T. Moreira, G. Feijoo, J. Lema, J. A. Field, R. Sierra-Alvarez

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Pulp brightness gains obtained by fungal biobleaching are often decreased by dark MnO2 deposits which are formed by the biologically- mediated oxidation of Mn(II). Oxalic acid extraction of O2-delignified kraft pulps bleached by several white-rot fungi was found to increase pulp brightness by up to 9.7 ISO points due to MnO2 dissolution. These results indicate that pulp extraction with oxalic acid can be used in order to accurately assess the net brightness gains achieved by fungal biobleaching.

Original languageEnglish (US)
Pages (from-to)559-564
Number of pages6
JournalBiotechnology Techniques
Volume10
Issue number8
DOIs
StatePublished - Jan 1 1996
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Applied Microbiology and Biotechnology

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