Ag Nanoparticles (Ag NM300K) in the Terrestrial Environment: Effects at Population and Cellular Level in Folsomia candida (Collembola)

Luís André Mendes, Vera L. Maria, Janeck J. Scott-Fordsmand and Mónica J. B. Amorim
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Luís André Mendes: Department of Biology & CESAM, University of Aveiro, Aveiro 3810-193, Portugal
Vera L. Maria: Department of Biology & CESAM, University of Aveiro, Aveiro 3810-193, Portugal
Janeck J. Scott-Fordsmand: Department of Bioscience, Aarhus University, Vejlsovej 25, PO BOX 314, Silkeborg DK-8600, Denmark
Mónica J. B. Amorim: Department of Biology & CESAM, University of Aveiro, Aveiro 3810-193, Portugal

IJERPH, 2015, vol. 12, issue 10, 1-13

Abstract: The effects of nanomaterials have been primarily assessed based on standard ecotoxicity guidelines. However, by adapting alternative measures the information gained could be enhanced considerably, e.g., studies should focus on more mechanistic approaches. Here, the environmental risk posed by the presence of silver nanoparticles (Ag NM300K) in soil was investigated, anchoring population and cellular level effects, i.e. , survival, reproduction (28 days) and oxidative stress markers (0, 2, 4, 6, 10 days). The standard species Folsomia candida was used. Measured markers included catalase (CAT), glutathione reductase (GR), glutathione S-transferase (GST), total glutathione (TG), metallothionein (MT) and lipid peroxidation (LPO). Results showed that AgNO 3 was more toxic than AgNPs at the population level: reproduction EC 20 and EC 50 was ca. 2 and 4 times lower, respectively. At the cellular level Correspondence Analysis showed a clear separation between AgNO 3 and AgNP throughout time. Results showed differences in the mechanisms, indicating a combined effect of released Ag + (MT and GST) and of AgNPs (CAT, GR, TG, LPO). Hence, clear advantages from mechanistic approaches are shown, but also that time is of importance when measuring such responses.

Keywords: antioxidant defenses; mechanisms of response; soil invertebrates. (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2015
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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