The role of silver and vanadium release in the toxicity of silver vanadate nanowires toward Daphnia similis

Abstract

Abstract-Nanomaterials are used in a wide spectrum of applications, including nanowires that are objects with at least one of its dimensions in the range of 1 to 100 nm. Recently, a new type of silver vanadate nanowire decorated with silver nanoparticles (SVSN-LQES1) with promising antimicrobial activity against different pathogenic bacteria was described. The objective of the present study was to evaluate the role of silver and vanadium release in the acute toxicity of this material using Daphnia similis. To verify the effect of the presence of the nanowires in the test solution, tests were performed before and after filtration. Total silver release to the testing media was determined using the method of inductively coupled plasma atomic emission spectroscopy (ICP-AES). Silver vanadate nanowires decorated with silver nanoparticles SVSN-LQES1 are acutely toxic to D. similis; the release of silver from the nanomaterial trapped in the gut along with the silver released to the test media seems to be responsible for the observed toxicity. Although toxic to Daphnia, vanadium does not contribute to the toxicity of SVSN-LQES1. The observed increase in lipid droplets appears to be related to the exposure of the organisms to the nanomaterials, but the significance of this response needs further investigation. Environ. Toxicol. Chem. 2013;32:908-912. # 2013 SETAC

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“…Lin et al (2012) (Knie & Lopes, 2004;Paschoalino et al, 2010). Furthermore, daphnids are considered a keystone species in aquatic toxicology because they are filter-feeders and are able to ingest NPs (Artal et al, 2013).Tests employing Daphnia have been used to evaluate the nanomaterials ecotoxicity, due to be important links in the food chain from algae consumed by them, and the fish that are predators (Paschoalino et al, 2010).They have also been proposed as a model organism for the ecotoxicological testing of nanomaterials (Paschoalino et al, 2010;Artal et al, 2013).…”

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