Knotwood and bark extracts: Strong antioxidants from waste materials

Suvi P. Pietarinen*, Stefan M. Willför, Markku O. Ahotupa, Jarl E. Hemming, Bjarne R. Holmbom

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

151 Citations (Scopus)

Abstract

The antioxidant properties of hydrophilic extracts of knotwood of several industrially important tree species were evaluated by lipid-peroxidation inhibition and peroxyl-trapping capacity tests. The results were compared with the antioxidant properties of hydrophilic extracts of bark, and pure lignans and flavonoids isolated from knotwood extracts. The knot extracts from several tree species were stronger antioxidants than the bark extracts, which can, however, also be classified as strong antioxidants. In addition, the antioxidant properties of most of the knotwood extracts are stronger than the pure compounds. It is concluded that knotwood is a rich source of natural antioxidants.

Original languageEnglish
Pages (from-to)436-444
Number of pages9
JournalJournal of Wood Science
Volume52
Issue number5
DOIs
Publication statusPublished - Oct 2006
MoE publication typeA1 Journal article-refereed

Keywords

  • Antioxidants
  • Bark
  • Flavonoids
  • Knots
  • Lignans

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