Slow release of a biocidal agent from polymeric microcapsules for preventing biodeterioration

Saila Jämsä (Corresponding Author), Riitta Mahlberg, Ulla Holopainen, Jarmo Ropponen, Anne Savolainen, Anne-Christine Ritschkoff

    Research output: Contribution to journalArticleScientificpeer-review

    54 Citations (Scopus)


    Water-soluble biocides are prone to excessive leaching and high concentrations are therefore required in surface coatings for successful protection of a surface against biodeterioration. Encapsulation prolongs the lifetime of biocides in different matrices by protecting them from leaching and by releasing them slowly. In this study, sodium benzoate as a model water-soluble biocidal agent and Congo Red dye as an capsulation indicator were incorporated into branched polyethyleneimines (PEIs) with molecular weights of 1300 and 5000 g/mol. Microscopic investigations verified that the Congo Red dye and sodium benzoate were entrapped within the capsules. The encapsulation capacity, release behaviour and efficiency of the encapsulated model biocide against two brown rot species Coniophora puteana and Serpula lacrymans were determined. The encapsulated water-soluble model biocide inhibited the growth of the decay fungi. The release of the biocide was based on slow diffusion from the capsules. The molecular weight of the encapsulated agent and the polyethyleneimine affected the release rate.
    Original languageEnglish
    Pages (from-to)269-276
    JournalProgress in Organic Coatings
    Issue number1
    Publication statusPublished - Jan 2013
    MoE publication typeA1 Journal article-refereed


    • Biocide
    • Decay resistance
    • Microencapsulation
    • Polyethyleneimine
    • Slow release


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