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Angela Ivask – One of the best experts on this subject based on the ideXlab platform.

  • Selective antibiofilm properties and biocompatibility of nano-ZnO and nano-ZnO/Ag coated Surfaces.
    Scientific Reports, 2020
    Co-Authors: Merilin Rosenberg, Anne Kahru, Meeri Visnapuu, Heik Vija, Vambola Kisand, Kaja Kasemets, Angela Ivask

    Abstract:

    Spread of pathogenic microbes and antibiotic-resistant bacteria in health-care settings and public spaces is a serious public health challenge. Materials that prevent solid Surface colonization or impede touch-transfer of viable microbes could provide means to decrease pathogen transfer from high-touch Surfaces in critical applications. ZnO and Ag nanoparticles have shown great potential in Antimicrobial applications. Less is known about nano-enabled Surfaces. Here we demonstrate that Surfaces coated with nano-ZnO or nano-ZnO/Ag composites are not cytotoxic to human keratinocytes and possess species-selective medium-dependent antibiofilm activity against Escherichia coli, Staphylococcus aureus and Candida albicans. Colonization of nano-ZnO and nano-ZnO/Ag Surfaces by E. coli and S. aureus was decreased in static oligotrophic conditions (no planktonic growth). Moderate to no effect was observed for bacterial biofilms in growth medium (supporting exponential growth). Inversely, nano-ZnO Surfaces enhanced biofilm formation by C. albicans in oligotrophic conditions. However, enhanced C. albicans biofilm formation on nano-ZnO Surfaces was effectively counteracted by the addition of Ag. Possible selective enhancement of biofilm formation by the yeast C. albicans on Zn-enabled Surfaces should be taken into account in Antimicrobial Surface development. Our results also indicated the importance of the use of application-appropriate test conditions and exposure medium in Antimicrobial Surface testing.

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  • Selective antibiofilm properties and biocompatibility of nano-ZnO and nano-ZnO/Ag coated Surfaces
    bioRxiv, 2020
    Co-Authors: Merilin Rosenberg, Anne Kahru, Meeri Visnapuu, Heik Vija, Vambola Kisand, Kaja Kasemets, Angela Ivask

    Abstract:

    Spread of pathogenic microbes and antibiotic-resistant bacteria in health-care settings and public spaces 1is a serious public health challenge. Materials and Surface-treatments that prevent solid Surface colonization and biofilm formation or impede touch-transfer of viable microbes could provide means to decrease pathogen transfer from high-touch Surfaces in critical applications. Both, ZnO and Ag nanoparticles have shown a great potential in Antimicrobial applications. Although Antimicrobial properties of such nanoparticle suspensions and their biocompatibility with human cells are well studied, less is known about nano-enabled solid Surfaces. Here we demonstrate that Surfaces coated with nano-ZnO or nano-ZnO/Ag composites possess species-selective medium-dependent antibiofilm activity against Escherichia coli, Staphylococcus aureus and Candida albicans. Colonization of nano-ZnO Surfaces by E. coli and S. aureus was decreased in oligotrophic (nutrient-poor, no growth) conditions with E. coli showing higher sensitivity to Ag and S. aureus to Zn, respectively. Minor to no effect was observed for bacteria in growth medium (nutrient-rich, exponential growth). Inversely, compared to uncoated Surfaces, nano-ZnO Surfaces enhanced biofilm formation by C. albicans in oligotrophic conditions and just a minor transient negative effect was seen in nutrient-rich medium. However, enhanced C. albicans biofilm formation on nano-ZnO Surfaces was effectively counteracted by the addition of Ag. Our results not only showed that nano-ZnO/Ag coated solid Surfaces have the potential to effectively decrease Surface colonization by the bacteria E. coli and S. aureus but also indicated the importance of the use of application-appropriate test conditions and exposure medium in Antimicrobial Surface testing. Possible selective enhancement of biofilm formation by the yeast C. albicans on Zn-enabled Surfaces should be taken into account in Antimicrobial Surface development.

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  • Potential ecotoxicological effects of Antimicrobial Surface coatings: a literature survey backed up by analysis of market reports.
    PeerJ, 2019
    Co-Authors: Merilin Rosenberg, Krunoslav Ilić, Katre Juganson, Angela Ivask, Merja Ahonen, Ivana Vinković Vrček, Anne Kahru

    Abstract:

    : This review was initiated by the COST action CA15114 AMICI “Anti-Microbial Coating Innovations to prevent infectious diseases,” where one important aspect is to analyze ecotoxicological impacts of Antimicrobial coatings (AMCs) to ensure their sustainable use. Scopus database was used to collect scientific literature on the types and uses of AMCs, while market reports were used to collect data on production volumes. Special attention was paid on data obtained for the release of the most prevalent ingredients of AMCs into the aqueous phase that was used as the proxy for their possible ecotoxicological effects. Based on the critical analysis of 2,720 papers, it can be concluded that silver-based AMCs are by far the most studied and used coatings followed by those based on titanium, copper, zinc, chitosan and quaternary ammonium compounds. The literature analysis pointed to biomedicine, followed by marine industry, construction industry (paints), food industry and textiles as the main fields of application of AMCs. The published data on ecotoxicological effects of AMCs was scarce, and also only a small number of the papers provided information on release of Antimicrobial ingredients from AMCs. The available release data allowed to conclude that silver, copper and zinc are often released in substantial amounts (up to 100%) from the coatings to the aqueous environment. Chitosan and titanium were mostly not used as active released ingredients in AMCs, but rather as carriers for other release-based Antimicrobial ingredients (e.g., conventional antibiotics). While minimizing the prevalence of healthcare-associated infections appeared to be the most prosperous field of AMCs application, the release of environmentally hazardous ingredients of AMCs into hospital wastewaters and thus, also the environmental risks associated with AMCs, comprise currently only a fraction of the release and risks of traditional disinfectants. However, being proactive, while the use of Antimicrobial/antifouling coatings could currently pose ecotoxicological effects mainly in marine applications, the broad use of AMCs in other applications like medicine, food packaging and textiles should be postponed until reaching evidences on the (i) profound efficiency of these materials in controlling the spread of pathogenic microbes and (ii) safety of AMCs for the human and ecosystems.

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Merilin Rosenberg – One of the best experts on this subject based on the ideXlab platform.

  • Selective antibiofilm properties and biocompatibility of nano-ZnO and nano-ZnO/Ag coated Surfaces.
    Scientific Reports, 2020
    Co-Authors: Merilin Rosenberg, Anne Kahru, Meeri Visnapuu, Heik Vija, Vambola Kisand, Kaja Kasemets, Angela Ivask

    Abstract:

    Spread of pathogenic microbes and antibiotic-resistant bacteria in health-care settings and public spaces is a serious public health challenge. Materials that prevent solid Surface colonization or impede touch-transfer of viable microbes could provide means to decrease pathogen transfer from high-touch Surfaces in critical applications. ZnO and Ag nanoparticles have shown great potential in Antimicrobial applications. Less is known about nano-enabled Surfaces. Here we demonstrate that Surfaces coated with nano-ZnO or nano-ZnO/Ag composites are not cytotoxic to human keratinocytes and possess species-selective medium-dependent antibiofilm activity against Escherichia coli, Staphylococcus aureus and Candida albicans. Colonization of nano-ZnO and nano-ZnO/Ag Surfaces by E. coli and S. aureus was decreased in static oligotrophic conditions (no planktonic growth). Moderate to no effect was observed for bacterial biofilms in growth medium (supporting exponential growth). Inversely, nano-ZnO Surfaces enhanced biofilm formation by C. albicans in oligotrophic conditions. However, enhanced C. albicans biofilm formation on nano-ZnO Surfaces was effectively counteracted by the addition of Ag. Possible selective enhancement of biofilm formation by the yeast C. albicans on Zn-enabled Surfaces should be taken into account in Antimicrobial Surface development. Our results also indicated the importance of the use of application-appropriate test conditions and exposure medium in Antimicrobial Surface testing.

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  • Selective antibiofilm properties and biocompatibility of nano-ZnO and nano-ZnO/Ag coated Surfaces
    bioRxiv, 2020
    Co-Authors: Merilin Rosenberg, Anne Kahru, Meeri Visnapuu, Heik Vija, Vambola Kisand, Kaja Kasemets, Angela Ivask

    Abstract:

    Spread of pathogenic microbes and antibiotic-resistant bacteria in health-care settings and public spaces 1is a serious public health challenge. Materials and Surface-treatments that prevent solid Surface colonization and biofilm formation or impede touch-transfer of viable microbes could provide means to decrease pathogen transfer from high-touch Surfaces in critical applications. Both, ZnO and Ag nanoparticles have shown a great potential in Antimicrobial applications. Although Antimicrobial properties of such nanoparticle suspensions and their biocompatibility with human cells are well studied, less is known about nano-enabled solid Surfaces. Here we demonstrate that Surfaces coated with nano-ZnO or nano-ZnO/Ag composites possess species-selective medium-dependent antibiofilm activity against Escherichia coli, Staphylococcus aureus and Candida albicans. Colonization of nano-ZnO Surfaces by E. coli and S. aureus was decreased in oligotrophic (nutrient-poor, no growth) conditions with E. coli showing higher sensitivity to Ag and S. aureus to Zn, respectively. Minor to no effect was observed for bacteria in growth medium (nutrient-rich, exponential growth). Inversely, compared to uncoated Surfaces, nano-ZnO Surfaces enhanced biofilm formation by C. albicans in oligotrophic conditions and just a minor transient negative effect was seen in nutrient-rich medium. However, enhanced C. albicans biofilm formation on nano-ZnO Surfaces was effectively counteracted by the addition of Ag. Our results not only showed that nano-ZnO/Ag coated solid Surfaces have the potential to effectively decrease Surface colonization by the bacteria E. coli and S. aureus but also indicated the importance of the use of application-appropriate test conditions and exposure medium in Antimicrobial Surface testing. Possible selective enhancement of biofilm formation by the yeast C. albicans on Zn-enabled Surfaces should be taken into account in Antimicrobial Surface development.

    Free Register to Access Article

  • Potential ecotoxicological effects of Antimicrobial Surface coatings: a literature survey backed up by analysis of market reports.
    PeerJ, 2019
    Co-Authors: Merilin Rosenberg, Krunoslav Ilić, Katre Juganson, Angela Ivask, Merja Ahonen, Ivana Vinković Vrček, Anne Kahru

    Abstract:

    : This review was initiated by the COST action CA15114 AMICI “Anti-Microbial Coating Innovations to prevent infectious diseases,” where one important aspect is to analyze ecotoxicological impacts of Antimicrobial coatings (AMCs) to ensure their sustainable use. Scopus database was used to collect scientific literature on the types and uses of AMCs, while market reports were used to collect data on production volumes. Special attention was paid on data obtained for the release of the most prevalent ingredients of AMCs into the aqueous phase that was used as the proxy for their possible ecotoxicological effects. Based on the critical analysis of 2,720 papers, it can be concluded that silver-based AMCs are by far the most studied and used coatings followed by those based on titanium, copper, zinc, chitosan and quaternary ammonium compounds. The literature analysis pointed to biomedicine, followed by marine industry, construction industry (paints), food industry and textiles as the main fields of application of AMCs. The published data on ecotoxicological effects of AMCs was scarce, and also only a small number of the papers provided information on release of Antimicrobial ingredients from AMCs. The available release data allowed to conclude that silver, copper and zinc are often released in substantial amounts (up to 100%) from the coatings to the aqueous environment. Chitosan and titanium were mostly not used as active released ingredients in AMCs, but rather as carriers for other release-based Antimicrobial ingredients (e.g., conventional antibiotics). While minimizing the prevalence of healthcare-associated infections appeared to be the most prosperous field of AMCs application, the release of environmentally hazardous ingredients of AMCs into hospital wastewaters and thus, also the environmental risks associated with AMCs, comprise currently only a fraction of the release and risks of traditional disinfectants. However, being proactive, while the use of Antimicrobial/antifouling coatings could currently pose ecotoxicological effects mainly in marine applications, the broad use of AMCs in other applications like medicine, food packaging and textiles should be postponed until reaching evidences on the (i) profound efficiency of these materials in controlling the spread of pathogenic microbes and (ii) safety of AMCs for the human and ecosystems.

    Free Register to Access Article

Anne Kahru – One of the best experts on this subject based on the ideXlab platform.

  • Selective antibiofilm properties and biocompatibility of nano-ZnO and nano-ZnO/Ag coated Surfaces.
    Scientific Reports, 2020
    Co-Authors: Merilin Rosenberg, Anne Kahru, Meeri Visnapuu, Heik Vija, Vambola Kisand, Kaja Kasemets, Angela Ivask

    Abstract:

    Spread of pathogenic microbes and antibiotic-resistant bacteria in health-care settings and public spaces is a serious public health challenge. Materials that prevent solid Surface colonization or impede touch-transfer of viable microbes could provide means to decrease pathogen transfer from high-touch Surfaces in critical applications. ZnO and Ag nanoparticles have shown great potential in Antimicrobial applications. Less is known about nano-enabled Surfaces. Here we demonstrate that Surfaces coated with nano-ZnO or nano-ZnO/Ag composites are not cytotoxic to human keratinocytes and possess species-selective medium-dependent antibiofilm activity against Escherichia coli, Staphylococcus aureus and Candida albicans. Colonization of nano-ZnO and nano-ZnO/Ag Surfaces by E. coli and S. aureus was decreased in static oligotrophic conditions (no planktonic growth). Moderate to no effect was observed for bacterial biofilms in growth medium (supporting exponential growth). Inversely, nano-ZnO Surfaces enhanced biofilm formation by C. albicans in oligotrophic conditions. However, enhanced C. albicans biofilm formation on nano-ZnO Surfaces was effectively counteracted by the addition of Ag. Possible selective enhancement of biofilm formation by the yeast C. albicans on Zn-enabled Surfaces should be taken into account in Antimicrobial Surface development. Our results also indicated the importance of the use of application-appropriate test conditions and exposure medium in Antimicrobial Surface testing.

    Free Register to Access Article

  • Selective antibiofilm properties and biocompatibility of nano-ZnO and nano-ZnO/Ag coated Surfaces
    bioRxiv, 2020
    Co-Authors: Merilin Rosenberg, Anne Kahru, Meeri Visnapuu, Heik Vija, Vambola Kisand, Kaja Kasemets, Angela Ivask

    Abstract:

    Spread of pathogenic microbes and antibiotic-resistant bacteria in health-care settings and public spaces 1is a serious public health challenge. Materials and Surface-treatments that prevent solid Surface colonization and biofilm formation or impede touch-transfer of viable microbes could provide means to decrease pathogen transfer from high-touch Surfaces in critical applications. Both, ZnO and Ag nanoparticles have shown a great potential in Antimicrobial applications. Although Antimicrobial properties of such nanoparticle suspensions and their biocompatibility with human cells are well studied, less is known about nano-enabled solid Surfaces. Here we demonstrate that Surfaces coated with nano-ZnO or nano-ZnO/Ag composites possess species-selective medium-dependent antibiofilm activity against Escherichia coli, Staphylococcus aureus and Candida albicans. Colonization of nano-ZnO Surfaces by E. coli and S. aureus was decreased in oligotrophic (nutrient-poor, no growth) conditions with E. coli showing higher sensitivity to Ag and S. aureus to Zn, respectively. Minor to no effect was observed for bacteria in growth medium (nutrient-rich, exponential growth). Inversely, compared to uncoated Surfaces, nano-ZnO Surfaces enhanced biofilm formation by C. albicans in oligotrophic conditions and just a minor transient negative effect was seen in nutrient-rich medium. However, enhanced C. albicans biofilm formation on nano-ZnO Surfaces was effectively counteracted by the addition of Ag. Our results not only showed that nano-ZnO/Ag coated solid Surfaces have the potential to effectively decrease Surface colonization by the bacteria E. coli and S. aureus but also indicated the importance of the use of application-appropriate test conditions and exposure medium in Antimicrobial Surface testing. Possible selective enhancement of biofilm formation by the yeast C. albicans on Zn-enabled Surfaces should be taken into account in Antimicrobial Surface development.

    Free Register to Access Article

  • Potential ecotoxicological effects of Antimicrobial Surface coatings: a literature survey backed up by analysis of market reports.
    PeerJ, 2019
    Co-Authors: Merilin Rosenberg, Krunoslav Ilić, Katre Juganson, Angela Ivask, Merja Ahonen, Ivana Vinković Vrček, Anne Kahru

    Abstract:

    : This review was initiated by the COST action CA15114 AMICI “Anti-Microbial Coating Innovations to prevent infectious diseases,” where one important aspect is to analyze ecotoxicological impacts of Antimicrobial coatings (AMCs) to ensure their sustainable use. Scopus database was used to collect scientific literature on the types and uses of AMCs, while market reports were used to collect data on production volumes. Special attention was paid on data obtained for the release of the most prevalent ingredients of AMCs into the aqueous phase that was used as the proxy for their possible ecotoxicological effects. Based on the critical analysis of 2,720 papers, it can be concluded that silver-based AMCs are by far the most studied and used coatings followed by those based on titanium, copper, zinc, chitosan and quaternary ammonium compounds. The literature analysis pointed to biomedicine, followed by marine industry, construction industry (paints), food industry and textiles as the main fields of application of AMCs. The published data on ecotoxicological effects of AMCs was scarce, and also only a small number of the papers provided information on release of Antimicrobial ingredients from AMCs. The available release data allowed to conclude that silver, copper and zinc are often released in substantial amounts (up to 100%) from the coatings to the aqueous environment. Chitosan and titanium were mostly not used as active released ingredients in AMCs, but rather as carriers for other release-based Antimicrobial ingredients (e.g., conventional antibiotics). While minimizing the prevalence of healthcare-associated infections appeared to be the most prosperous field of AMCs application, the release of environmentally hazardous ingredients of AMCs into hospital wastewaters and thus, also the environmental risks associated with AMCs, comprise currently only a fraction of the release and risks of traditional disinfectants. However, being proactive, while the use of Antimicrobial/antifouling coatings could currently pose ecotoxicological effects mainly in marine applications, the broad use of AMCs in other applications like medicine, food packaging and textiles should be postponed until reaching evidences on the (i) profound efficiency of these materials in controlling the spread of pathogenic microbes and (ii) safety of AMCs for the human and ecosystems.

    Free Register to Access Article