Surface modification of atmospheric plasma activated BOPP by immobilizing chitosan

Jari Vartiainen (Corresponding Author), Marjaana Rättö, Unto Tapper, Sabine Paulussen, Eero Hurme

    Research output: Contribution to journalArticleScientificpeer-review

    52 Citations (Scopus)


    Chitosan was immobilized onto plasma activated biaxially oriented polypropylene (BOPP) films aimed at producing antimicrobially active barrier film for food packaging applications. 1% chitosan dissolved into 0.1 M acetic acid was mixed with 0.1% glutaraldehyde (cross-linking agent) and applied onto N2-plasma + NH3 activated BOPP film. Amount of immobilized chitosan was 1.8 g/m2. Films had strong antimicrobial activity against both Bacillus subtilis and Escherichia coli and they reduced the oxygen transmission rate (OTR) measured in dry conditions from 1500 down to 27 cm3/(m2·24 h). Migration tests for determining the total amounts of substances migrating into food simulants (3% acetic acid, 95% ethanol and iso-octane) indicated, that chitosan coating was permanently immobilized onto BOPP without any leaching (total migration < 2 mg/dm2), thus it met the requirements stipulated in Directive 2002/72/EC relating to plastic materials and articles intended to come into contact with foodstuffs. The results suggest that chitosan treated BOPP films may be exploited in various food packaging applications requiring high oxygen barrier and/or antimicrobially active packaging materials.
    Original languageEnglish
    Pages (from-to)343 - 352
    Number of pages10
    JournalPolymer Bulletin
    Issue number4-5
    Publication statusPublished - 2005
    MoE publication typeA1 Journal article-refereed


    • chitosan
    • food packaging
    • packaging materials
    • antimicrobials


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