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Isolation of extracellular polymeric substances from Pseudomonas lundensis biofilm and its effect on surface properties of microplastics
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Researchers coated microplastic samples, made from food packaging film, with material from biofilms of Pseudomonas lundensis bacteria linked to chicken spoilage. Using three extraction methods, they found the material changed the microplastic surface's chemistry and energy, with the degree of change depending on how the bacterial material was isolated.
Na površino mikroplastike se veže organska snov, ki značilno vpliva na njene fizikalno-kemijske lastnosti. V sklopu tega magistrskega dela smo preverili, kako zunajcelični matriks biofilma bakterij Pseudomonas lundensis, povezanih s kvarom piščančjega mesa, vpliva na površinske lastnosti mikroplastike, pripravljene iz folije za pakiranje živil na osnovi polietilen tereftalata. Zunajcelični matriks smo izolirali z uporabo treh različnih metod: centrifugiranja (B), metode z natrijevim karbonatom (C) ter metode s formaldehidom in NaOH (F). Njegovo sestavo smo ovrednotili glede na vsebnost polisaharidov, proteinov in zunajcelične DNA. Mikroplastiko smo inkubirali v izolatih zunajceličnega matriksa in nato spremembe v njenih površinskih lastnostih ovrednotili z meritvami kontaktnega kota, rentgensko fotoelektronsko spektroskopijo (XPS) in masno spektrometrijo sekundarnih ionov s časom preleta (ToF-SIMS). Ugotovili smo, da izbira metode izolacije pomembno vpliva na vsebnost posameznih komponent v izolatu. Ostanki zunajceličnega matriksa na mikroplastiki so vplivali na povečanje proste površinske energije, pri čemer so bile statistično značilne razlike ugotovljene pri zunajceličnem matriksu, izoliranem z metodama C in F. Analizi XPS in ToF-SIMS sta potrdili spremembe v kemijski sestavi površine mikroplastike. Rezultati kažejo, da je vpliv zunajceličnega matriksa biofilma bakterij P. lundensis na površinske lastnosti mikroplastike odvisen od njegove biokemijske sestave ter da zunajcelični matriks prispeva k nastanku organskih kondicionirnih plasti, katerih lastnosti se med posameznimi izolati matriksa razlikujejo.
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