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.
Similar content being viewed by others
References
Blanchette, R.A. (1984). Phytopathology 74:725–730.
Cui, F. and Dolphin, D. Holzforschung 44(4):279–283.
De Jong, E., Field J.A. and De Bont, J.A.M. (1992). FEBS Lett. 299:107–110.
Glenn, J.K., Akileswaran, L. and Gold, M.H. (1986). Arch. Biochem. Biophysics 251(2):688–696.
Hattori, T. and Shimada, M. (1995). In: Abstract book 6th. Int. Conf. Biotechnol. Pulp Paper Industry. June 11–15, Viena, Austria, p. 158.
Iiyama, K. and Wallis, A.F.A. (1988). Wood Sci. Technol, 22:271–280.
Kuan, I.-C. and Tien, M. (1993). In: Proc. 7th. Int. Symp. Wood Pulping Chem. May 25–28, Beijing, China. Vol. II. pp. 722–725.
Mester, T., De Jong, E. and Field, J.A. (1995). Appl. Environ. Microbiol. 61:1881–1887.
Perez, J. and Jeffries, T.W. (1993). Appl Biochem. Biotechnol. 39/40:227–238.
Kerem, Z. and Hadar, Y. (1993). Appl. Environ. Microbiol. 59(12):4115–4120.
Kondo, R., Koichi, H. and Sakai, K. (1994). Appl. Environ. Microbiol. 60(12):4359–4363.
Paice, M.G., Reid, I.D., Bourbonnais, R. and Jurasek, L. (1993). Appl. Environ. Microbiol. 59(1):260–265.
Shimada, M., Ma, D., Akamatsu, Y. and Hattori, T. (1994). FEMS Microbiol. Rev. 13:285–296.
Tien, M. and Kirk, T.K. (1988). Methods Enzymol. 161:238–248.
Wariishi, H., Akileswaran, L. and Gold, M.H. (1988). Biochem. 27:5365–5370.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Moreira, M.T., Feijoo, G., Lema, J. et al. Oxalic acid extraction as a posttreatment to increase the brightness of kraft pulps bleached by white-rot fungi. Biotechnol Tech 10, 559–564 (1996). https://doi.org/10.1007/BF00157361
Issue Date:
DOI: https://doi.org/10.1007/BF00157361