PVC silver zeolite composites with antimicrobial properties |
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Authors: | Daniela Zampino Tiziana Ferreri Concetto Puglisi Monique Mancuso Renata Zaccone Roberto Scaffaro and Danila Bennardo |
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Affiliation: | (1) Institute of Chemistry and Technology of Polymers, CNR, Via Paolo Gaifami 18, 95126 Catania, Italy;(2) Institute for Coastal Marine Environment, CNR, 98122 Messina, Italy;(3) Department of Chemical, Process and Materials Engineering, UNIPA, 90128 Palermo, Italy;(4) Milena Pharmaceutical Srl, 92100 Agrigento, Italy |
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Abstract: | Poly(vinyl chloride) (PVC) composites containing increasing amounts (2–20%, w/w) of silver zeolite (SZ) were prepared by melt
mixing and characterized by thermal, mechanical and rheological analyses. The addition of large amount of SZ did not influence
the processability and the formability of the composites, if compared to neat plasticized PVC. The antibacterial activity
of PVC SZ composites was tested on Escherichia coli and Staphylococcus epidermidis and resulted promising both in culture broth and on agar plate and also in sterile urine seeded with these strains, for simulation
purposes. In sterile urine, composites induced a significant reduction (4–6 log units) of viability of both strains already
at 24 h, inhibiting E. coli growth up to 20 days, whereas their antimicrobial action against S. epidermidis vanished within 5 days. The silver release in sterile urine was determined up to 20 days. It was found that the highest amount
of silver ions was released during the first day (0.365 ppm), whilst from days 6 to 20 the silver release decreased, reaching
a steady daily mean value of 0.02 ppm. |
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