Antioxidant Activity of Knotwood Eextractives and Phenolic Compounds of Selected Tree Species

S.M. Willför, M.O. Ahotupa, J.E. Hemming, M.H.T. Reunanen, P.C. Eklund, R.E. Sjöholm, C.S.E. Eckerman, S.P. Pohjamo, B.R. Holmbom

Research output: Contribution to journalArticleScientificpeer-review

163 Citations (Scopus)

Abstract

The antioxidant potency and the radical scavenging capacity of superoxide and peroxyl radicals were assessed for 13 hydrophilic knotwood extracts of commercially important wood species, or fractions thereof, as well as for five pure wood-derived lignans and the flavonoid taxifolin. The chemical composition of the knotwood extracts was determined by gas chromatography combined with mass spectrometry. Most of the investigated wood species were rich in hydrophilic extractives (10-20% of the dry wood) with one or a few compounds dominating in each extract. All extracts had a high antioxidative potency and/or radical scavenging capacity as compared to the well-known antioxidants Trolox and butylated hydroxyanisole. The pure wood-derived lignans and taxifolin also had a high antioxidative potency and/or radical scavenging capacity. However, the antioxidant potency and/or radical scavenging capacity of several of the hydrophilic knotwood extracts were higher than that of the dominating compounds in pure form.
Original languageEnglish
Pages (from-to)7600–7606
Number of pages7
JournalJournal of Agricultural and Food Chemistry
Volume51
Issue number26
DOIs
Publication statusPublished - 2003
MoE publication typeA1 Journal article-refereed

Keywords

  • antioxidant potency
  • branch base
  • flavonolds
  • juvabiones
  • knots
  • knotwood
  • lignans
  • oligolignans
  • phenolic compounds
  • pinosylvins
  • radical scavenging

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