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

Stefan Willför, Markku O. Ahotupa, Jarl Hemming, Markku H. T. Reunanen, Patrik Christoffer Eklund, Rainer E. Sjöholm, Christer S. E. Eckerman, Suvi P. Pohjamo, Bjarne R. Holmbom

    Research output: Contribution to journalArticleScientificpeer-review

    163 Citations (Scopus)


    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 languageUndefined/Unknown
    Pages (from-to)7600–7606
    Number of pages7
    JournalJournal of Agricultural and Food Chemistry
    Issue number26
    Publication statusPublished - 2003
    MoE publication typeA1 Journal article-refereed


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

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