Effects of bacterial treatments on wood extractives

Anne Kallioinen (Corresponding Author), Anu Vaari, Marjaana Rättö, Jonas Konn, Matti Siika-aho, Liisa Viikari

    Research output: Contribution to journalArticleScientificpeer-review

    53 Citations (Scopus)


    Bacterial strains were isolated from spruce wood chips and their ability to reduce the content of wood extractives was studied. Strains were screened by cultivation on liquid media containing wood extractives as the major nutrient. Some bacterial species could decrease remarkably the amount of extractives in the liquid media and reduced the amount of triglycerides, steryl esters and total extractives by 100, 20 and 39%, respectively. Spruce wood chips were treated in controlled conditions with selected bacteria to test their effects on the chips. All the bacteria grew well on wood chips. The effect of bacterial metabolism on wood extractives was significant. Bacterial treatments reduced the amount of lipophilic extractives by 16–38% in 1 week of treatment and up to 67% in 2 weeks. The most efficient strain removed 90, 66 and 50% of triglycerides, steryl esters and resin acids, respectively, in 2 weeks. These results indicate that bacteria may be promising agents for the removal of extractives for improved pulping and papermaking processes.
    Original languageEnglish
    Pages (from-to)67-76
    Number of pages10
    JournalJournal of Biotechnology
    Issue number1
    Publication statusPublished - 2003
    MoE publication typeA1 Journal article-refereed


    • Biopulping, lipophilic wood extractives
    • Pitch
    • Norway spruce
    • Wood degradation


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