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Attachment Efficiency of Nanomaterials to Algae as an Important Criterion for Ecotoxicity and Grouping.

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Title: Attachment Efficiency of Nanomaterials to Algae as an Important Criterion for Ecotoxicity and Grouping.
Authors: Hund-Rinke, Kerstin1 (AUTHOR) t.sinram@googlemail.com, Sinram, Tim1 (AUTHOR) karsten.schlich@ime.fraunhofer.de, Schlich, Karsten1 (AUTHOR), Nickel, Carmen2 (AUTHOR) nickel@iuta.de, Dickehut, Hanna Paula3 (AUTHOR) Hanna.P.D@gmx.de, Schmidt, Matthias3 (AUTHOR) matthias.schmidt@ufz.de, Kühnel, Dana3 (AUTHOR) dana.kuehnel@ufz.de
Source: Nanomaterials (2079-4991). Jun2020, Vol. 10 Issue 6, p1021. 1p.
Subjects: Organisation for Economic Co-operation & Development, Electron microscopy, Nanostructured materials, Microscopy, Green algae, Algae, Algal cells, Toxicity testing
Abstract: Engineered nanomaterials (ENMs) based on CeO2 and TiO2 differ in their effects on the unicellular green alga Raphidocelis subcapitata but these effects do not reflect the physicochemical parameters that characterize such materials in water and other test media. To determine whether interactions with algae can predict the ecotoxicity of ENMs, we studied the attachment of model compounds (three subtypes of CeO2 and five subtypes of TiO2) to algal cells by light microscopy and electron microscopy. We correlated our observations with EC50 values determined in growth inhibition assays carried out according to the Organisation for Economic Co-operation and Development (OECD) test guideline 201. Light microscopy revealed distinct patterns of ENM attachment to algal cells according to the type of compound, with stronger interactions leading to greater toxicity. This was confirmed by electron microscopy, which allowed the quantitative assessment of particle attachment. Our results indicate that algal extracellular polymeric substances play an important role in the attachment of ENMs, influencing the formation of agglomerates. The attachment parameters in short-term tests predicted the toxicity of CeO2 and TiO2 ENMs and can be considered as a valuable tool for the identification of sets of similar nanoforms as requested by the European Chemicals Agency in the context of grouping and read-across. [ABSTRACT FROM AUTHOR]
Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Attachment Efficiency of Nanomaterials to Algae as an Important Criterion for Ecotoxicity and Grouping.
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  Data: <searchLink fieldCode="AR" term="%22Hund-Rinke%2C+Kerstin%22">Hund-Rinke, Kerstin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> t.sinram@googlemail.com</i><br /><searchLink fieldCode="AR" term="%22Sinram%2C+Tim%22">Sinram, Tim</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> karsten.schlich@ime.fraunhofer.de</i><br /><searchLink fieldCode="AR" term="%22Schlich%2C+Karsten%22">Schlich, Karsten</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nickel%2C+Carmen%22">Nickel, Carmen</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> nickel@iuta.de</i><br /><searchLink fieldCode="AR" term="%22Dickehut%2C+Hanna+Paula%22">Dickehut, Hanna Paula</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> Hanna.P.D@gmx.de</i><br /><searchLink fieldCode="AR" term="%22Schmidt%2C+Matthias%22">Schmidt, Matthias</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> matthias.schmidt@ufz.de</i><br /><searchLink fieldCode="AR" term="%22Kühnel%2C+Dana%22">Kühnel, Dana</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> dana.kuehnel@ufz.de</i>
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  Data: <searchLink fieldCode="JN" term="%22Nanomaterials+%282079-4991%29%22">Nanomaterials (2079-4991)</searchLink>. Jun2020, Vol. 10 Issue 6, p1021. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Organisation+for+Economic+Co-operation+%26+Development%22">Organisation for Economic Co-operation & Development</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+microscopy%22">Electron microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Nanostructured+materials%22">Nanostructured materials</searchLink><br /><searchLink fieldCode="DE" term="%22Microscopy%22">Microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Green+algae%22">Green algae</searchLink><br /><searchLink fieldCode="DE" term="%22Algae%22">Algae</searchLink><br /><searchLink fieldCode="DE" term="%22Algal+cells%22">Algal cells</searchLink><br /><searchLink fieldCode="DE" term="%22Toxicity+testing%22">Toxicity testing</searchLink>
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  Data: Engineered nanomaterials (ENMs) based on CeO2 and TiO2 differ in their effects on the unicellular green alga Raphidocelis subcapitata but these effects do not reflect the physicochemical parameters that characterize such materials in water and other test media. To determine whether interactions with algae can predict the ecotoxicity of ENMs, we studied the attachment of model compounds (three subtypes of CeO2 and five subtypes of TiO2) to algal cells by light microscopy and electron microscopy. We correlated our observations with EC50 values determined in growth inhibition assays carried out according to the Organisation for Economic Co-operation and Development (OECD) test guideline 201. Light microscopy revealed distinct patterns of ENM attachment to algal cells according to the type of compound, with stronger interactions leading to greater toxicity. This was confirmed by electron microscopy, which allowed the quantitative assessment of particle attachment. Our results indicate that algal extracellular polymeric substances play an important role in the attachment of ENMs, influencing the formation of agglomerates. The attachment parameters in short-term tests predicted the toxicity of CeO2 and TiO2 ENMs and can be considered as a valuable tool for the identification of sets of similar nanoforms as requested by the European Chemicals Agency in the context of grouping and read-across. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3390/nano10061021
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      – Code: eng
        Text: English
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        PageCount: 1
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      – SubjectFull: Organisation for Economic Co-operation & Development
        Type: general
      – SubjectFull: Electron microscopy
        Type: general
      – SubjectFull: Nanostructured materials
        Type: general
      – SubjectFull: Microscopy
        Type: general
      – SubjectFull: Green algae
        Type: general
      – SubjectFull: Algae
        Type: general
      – SubjectFull: Algal cells
        Type: general
      – SubjectFull: Toxicity testing
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      – TitleFull: Attachment Efficiency of Nanomaterials to Algae as an Important Criterion for Ecotoxicity and Grouping.
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              M: 06
              Text: Jun2020
              Type: published
              Y: 2020
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