Journal of Wood Science

, Volume 56, Issue 2, pp 133–139

Formation of a complex with aluminum by ozone-treated kraft lignins and their low molecular weight fragments

  • Hikaru Aimi
  • Ko Tahara
  • Yasuji Kurimoto
  • Shigeru Yamauchi
Original Article

DOI: 10.1007/s10086-009-1075-8

Cite this article as:
Aimi, H., Tahara, K., Kurimoto, Y. et al. J Wood Sci (2010) 56: 133. doi:10.1007/s10086-009-1075-8

Abstract

The formation of a complex with aluminum by low molecular weight compounds and saponified ozone-treated kraft lignins was evaluated based on the decrease in pH of their solutions on the addition of 0.1 M AlCl3. Decreases in pH were observed with the solutions containing compounds having adjacent carboxyl groups (oxalic acid), carboxyl/alcoholic hydroxyl groups (glycolic acid), carboxyl/formyl groups (glyoxylic acid), and phenolic hydroxyl groups (protocatechuic acid) on the addition of 0.1 M AlCl3. The malonic and phthalic acids, having two carboxyl groups, were also effective. These results show that the compounds were effective in forming complexes with aluminum. This finding corresponds to the fact that aluminum toxicity is reduced by formation of a complex with aluminum, except in phthalic acid. The chemical structures stated above in ozone-treated kraft lignins contribute, at least partly, to the complex with aluminum. The pH of solutions containing saponified ozone-treated kraft lignins and alkaline-treated kraft lignin decreased more than that without modified kraft lignins on the addition of 0.1 M AlCl3, showing that they were effective in forming a complex with aluminum. The high molecular weight part of saponified ozone-treated kraft lignin was effective in forming a complex with aluminum and in reducing its toxicity.

Key words

AluminumComplexLigninAluminum toxicityOzone

Copyright information

© The Japan Wood Research Society 2009

Authors and Affiliations

  • Hikaru Aimi
    • 1
  • Ko Tahara
    • 2
  • Yasuji Kurimoto
    • 1
  • Shigeru Yamauchi
    • 1
  1. 1.Institute of Wood TechnologyAkita Prefectural UniversityNoshiro, AkitaJapan
  2. 2.Department of Molecular and Cell BiologyForestry and Forest Products Research InstituteIbarakiJapan