Role of paramagnetic polyconjugated clusters in lignin antioxidant activity (in vitro)

T. Dizhbite, J. Ponomarenko, A. Andersone, G. Dobele, M. Lauberts, J. Krasilnikova, N. Mironova-Ulmane, G. Telysheva

Research output: Contribution to journalConference articlepeer-review

5 Citations (Scopus)


Using physico-chemical methods (EPR, SEC, Py-GC/MS and UV/VIS spectroscopy) and wet chemical analysis, the characteristics of 6 hardwood lignins in terms of functionality, molecular weight and composition of lignin substructures were determined and considered together with the results of DPPH•, ABTS •+ and O2•- antioxidant assays with the aim to understand the relationships governing antioxidant properties of lignin. The strong positive linear correlation between lignin antioxidant capacity in the three assays used and the extent of conjugation of paramagnetic polyconjugated clusters in lignin macromolecules was found. The biological activity of the most active alkaline lignins was assessed by in vitro experiment with human blood.

Original languageEnglish
Article number012033
JournalIOP Conference Series: Materials Science and Engineering
Issue number1
Publication statusPublished - 2012
EventInternational Conference on Functional Materials and Nanotechnologies - Riga, Latvia
Duration: 17 Apr 201220 Apr 2012

Field of Science*

  • 2.5 Materials engineering

Publication Type*

  • 3.1. Articles or chapters in proceedings/scientific books indexed in Web of Science and/or Scopus database


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