Biorazgradnja kirurških mask z glivami

Golmajer Zima, Andraž (author), Kržišnik, Davor (mentor), Poljanšek, Ida (comentor)

V magistrski nalogi smo želeli dokazati razkroj plastike z glivami. Uporabili smo kirurške maske, ki so narejene iz polipropilena ter jih v 16 tednih izpostavitve želeli razkrojiti z Aspergillus niger, Trametes versicolor in Pleurotus ostreatus. Vzorce smo pripravili na dva načina: z razrezom na velikost 2×7 cm in z mletjem s pomočjo suhega ledu. Polovico razrezanih vzorcev smo pred izpostavitvijo glivam izpostavili UV svetlobi za 168 ur. Cilji naloge so bili dokazati, da so določene glive zmožne razkrojiti polipropilen in da UV predobdelava poveča razkroj. Rezultati FT-IR analize so pokazali zmanjšane signale med valovnimi števili 3000 in 2800 cm-1 in okoli valovnih števil 1000 cm-1, kar nakazuje na začetek razkroja CH skupin polipropilena. Rezultati natezne trdnosti so pokazali, da sta glivi Aspergillus niger in Pleurotus ostreatus uspešno zmanjšali natezno trdnost srednje, najšibkejše plasti maske, poleg tega je UV svetloba uspešno zmanjšala natezno trdnost srednje plasti. Pri merjenju gostote vzorca kot poroznega materiala z napravo GeoPyc, so imeli kontrolni vzorci predhodno obdelani z UV svetlobo nižjo gostoto, kot kontrolni vzorci brez UV predobdelave. Dokazali smo, da so določene glive sposobne razgraditi polipropilen in da predobdelava z UV pomaga pri razkroju polipropilena.

• Language: Slovenian
• Keywords: glive, kirurške maske, biorazgradnja, plastika, polipropilen
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: BF - Biotechnical Faculty
• Publisher: [A. Golmajer Zima]
• Year: 2023
• PID: 20.500.12556/RUL-152057
• UDC: 630*844.2
• COBISS.SI-ID: 170623747
• Publication date in RUL: 29.10.2023

GOLMAJER ZIMA, Andraž, 2023, Biorazgradnja kirurških mask z glivami [online]. Master’s thesis. A. Golmajer Zima. [Accessed 5 April 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=152057

Secondary language

• Language: English
• Title: Fungal biodegradation of surgical masks

Abstract

In this thesis, we wanted to demonstrate the degradation of plastics by fungi. We used surgical masks made of polypropylene and wanted to degrade them with Aspergillus niger, Trametes versicolor and Pleurotus ostreatus during 16 weeks of exposure. The samples were prepared in two ways: by cutting to a size of 2 × 7 cm and by grinding using dry ice. Half of the cut samples were exposed to UV light for 168 hours before exposure to the fungi. The objectives of the thesis were to demonstrate that certain fungi are capable of degrading polypropylene and that UV pre-treatment enhances degradation. The results of the FT-IR analysis showed reduced signals between the wavenumbers 3000 and 2800 cm-1 and around the wavenumber 1000 cm-1, indicating the onset of degradation of the CH groups of polypropylene. The tensile strength results showed that the fungi Aspergillus niger and Pleurotus ostreatus successfully reduced the tensile strength of the middle, weakest layer, and UV light successfully reduced the tensile strength of the middle layer. When measuring the density of the sample as a porous material with the GeoPyc device, the control samples pre-treated with UV light had a lower density than the control samples without UV pre-treatment. We have shown that certain fungi are able to degrade polypropylene and that UV pre-treatment helps to degrade polypropylene.

• Keywords: fungi, surgical masks, biodegradation, plastic, polypropylen