OXALIC-ACID EXTRACTION AS A POSTTREATMENT TO INCREASE THE BRIGHTNESS OF KRAFT PULPS BLEACHED BY WHITE-ROT FUNGI

Authors
MOREIRA MT FEIJOO G LEMA J FIELD JA SIERRAALVAREZ R
Citation
Mt. Moreira et al., OXALIC-ACID EXTRACTION AS A POSTTREATMENT TO INCREASE THE BRIGHTNESS OF KRAFT PULPS BLEACHED BY WHITE-ROT FUNGI, Biotechnology techniques, 10(8), 1996, pp. 559-564
Citations number
15
Categorie Soggetti
Biothechnology & Applied Migrobiology
Journal title
Biotechnology techniques → ACNP
ISSN journal
0951208X
Volume
10
Issue
8
Year of publication
1996
Pages
559 - 564
Database
ISI
SICI code
0951-208X(1996)10:8<559:OEAAPT>2.0.ZU;2-O
Abstract
Pulp brightness gains obtained by fungal biobleaching are often decrea sed by dark MnO2 deposits which are formed by the biologically-mediate d oxidation of Mn(II). Oxalic acid extraction of O-2-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 resu lts indicate that pulp extraction with oxalic acid can be used in orde r to accurately assess the net brightness gains achieved by fungal bio bleaching.